[go: up one dir, main page]

US20120216920A1 - Automobile part manufacturing method using quenched steel sheet - Google Patents

Automobile part manufacturing method using quenched steel sheet Download PDF

Info

Publication number
US20120216920A1
US20120216920A1 US13/390,537 US201013390537A US2012216920A1 US 20120216920 A1 US20120216920 A1 US 20120216920A1 US 201013390537 A US201013390537 A US 201013390537A US 2012216920 A1 US2012216920 A1 US 2012216920A1
Authority
US
United States
Prior art keywords
less
blank
sheets
steel sheets
preparation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/390,537
Inventor
Seung-Man Nam
Su-Hong Chae
Min-Suck Kwon
Hyo-Sub Kim
Hee-Joong Im
Bo-Ryong Lee
Man-Bean Moon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hyundai Steel Co
Original Assignee
Hyundai Hysco Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hyundai Hysco Co Ltd filed Critical Hyundai Hysco Co Ltd
Assigned to HYUNDAI HYSCO reassignment HYUNDAI HYSCO ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHAE, SU-HONG, IM, HEE-JOONG, KIM, HYO-SUB, KWON, MIN-SUCK, LEE, BO-RYONG, MOON, MAN-BEAN, NAM, SEUNG-MAN
Publication of US20120216920A1 publication Critical patent/US20120216920A1/en
Assigned to HYUNDAI STEEL COMPANY reassignment HYUNDAI STEEL COMPANY MERGER (SEE DOCUMENT FOR DETAILS). Assignors: HYUNDAI HYSCO CO., LTD.
Abandoned legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B23K26/26—Seam welding of rectilinear seams
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/12—Aluminium or alloys based thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/006—Vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/18—Sheet panels
    • B23K2101/185—Tailored blanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/34—Coated articles, e.g. plated or painted; Surface treated articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/18—Dissimilar materials
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2251/00—Treating composite or clad material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2251/00—Treating composite or clad material
    • C21D2251/02—Clad material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys

Definitions

  • the present invention relates to a method of manufacturing an automobile part having different local strengths and, more particularly, to a method of manufacturing an automobile part using a steel sheet subjected to heat-treatment hardening and having different local thicknesses.
  • an automobile part may require high strength to satisfy structural characteristics thereof and other components thereof may require high impact resistance.
  • the automobile includes parts having different local strengths (or mechanical properties).
  • a welded zone undergoes reheating and cooling, so that heat treatment effects can disappear.
  • the welded zone suffers from strength deterioration and can break upon collision of the automobile.
  • the present invention is directed to providing an automobile part that is manufactured through a heat-treatment hardening/forming process to prevent residual stress.
  • the present invention is directed to providing an automobile part that does not suffer from deterioration in strength at a welded zone.
  • the present invention is directed to providing an automobile part that does not suffer from a spring back phenomenon and ensures excellent dimensional accuracy.
  • a method of manufacturing an automobile part which includes: preparing blank sheets using steel sheets subjected to heat-treatment hardening and having different thicknesses or different material properties according to desired strength; forming a blank assembly by joining the blank sheets to each other via laser welding; cold-pressing the blank assembly; and heating the cold-pressed part to a temperature of AC 3 or more, followed by quenching the cold-pressed part received within dies to remove residual stress while increasing strength of the automobile part.
  • a method of manufacturing an automobile part which includes: preparing blank sheets using steel sheets subjected to heat-treatment hardening and having different thicknesses or different material properties according to desired strength; forming a blank assembly by joining the blank sheets to each other via laser welding; cold-pressing the blank assembly to an extent of 80 to 99% of a final shape of an automobile part; and heating the cold-pressed part to a temperature of AC 3 or more to form the remaining 1 to 20% of the final shape, followed by quenching the automobile part received within dies to remove residual stress while increasing strength of the automobile part.
  • a method of manufacturing an automobile part which includes: preparing blank sheets using steel sheets subjected to heat-treatment hardening and having different thicknesses or different material properties according to desired strength; forming a blank assembly by joining the blank sheets to each other via laser welding; and heating the blank assembly to a temperature of AC 3 or more, followed by hot-pressing the blank assembly and quenching the hot-pressed part received within dies to remove residual stress while increasing strength of the automobile part.
  • the steel sheet may include a non-plated cold-rolled steel sheet or a steel sheet subjected to surface treatment by at least one process selected from among Zn plating, Al plating, Al—Si plating and high temperature oxidizing agent coating.
  • blanks are prepared using a steel sheet subjected to heat-treatment hardening, joined to each other via laser welding, followed by cold-forming and/or hot-forming to have a desired shape and quenching.
  • the produced part does not suffer from residual stress and has high dimensional accuracy.
  • a laser welded zone of the produced part is also subjected to heat treatment together with the steel sheet matrix, thereby exhibiting the same mechanical properties as those of the steel sheet matrix.
  • FIG. 1 is a flowchart of a method of manufacturing an automobile part having different local strengths using steel sheets subjected to heat-treatment hardening in accordance with a first embodiment of the present invention
  • FIG. 2 shows an automobile part in each process of the method of manufacturing an automobile part in accordance with the first embodiment of the present invention
  • FIG. 3 is a flowchart of a method of manufacturing an automobile part having different local strengths using steel sheets subjected to heat-treatment hardening in accordance with a second embodiment of the present invention
  • FIG. 4 shows an automobile part in each process of the method of manufacturing an automobile part in accordance with the second embodiment of the present invention
  • FIG. 5 is a flowchart of a method of manufacturing an automobile part having different local strengths using steel sheets subjected to heat-treatment hardening in accordance with a third embodiment of the present invention.
  • FIG. 6 shows an automobile part in each process of the method of manufacturing an automobile part in accordance with the third embodiment of the present invention.
  • FIG. 1 is a flowchart of a method of manufacturing an automobile part having different local strengths using steel sheets subjected to heat-treatment hardening in accordance with a first embodiment of the present invention.
  • FIG. 2 shows an automobile part in each process of the method of manufacturing an automobile part in accordance with the first embodiment.
  • a method of manufacturing an automobile part according to this embodiment includes:
  • a blank assembly forming process S- 12 in which a blank assembly is formed by joining the blank sheets to each other via laser welding;
  • a heat-treatment hardening process S- 14 in which the cold-pressed part is heated to a temperature of AC 3 or more, followed by quenching the cold-pressed part received within dies to remove residual stress while increasing strength of the produced automobile part.
  • FIG. 2 shows a process of manufacturing a side reinforcing structure for an automobile by the method according to the first embodiment.
  • the side reinforcing structure needs to have different local strengths. Furthermore, for reduction in weight of an automobile, it is preferable that a high strength steel sheet used for the automobile be as strong and thin as possible.
  • blank sheets are prepared from steel sheets subjected to heat-treatment hardening to have different mechanical properties and different thicknesses, and are joined to each other by laser welding.
  • the blank sheets corresponding to respective components of an automobile part are prepared from the steel sheets subjected to heat-treatment hardening and having different thicknesses according to desired strength.
  • the prepared blank sheets are joined to each other by laser welding to form a blank assembly.
  • the blank assembly is subjected to cold-pressing to form a desired shape of the automobile part.
  • cold-pressing is performed, dimensional accuracy of the part can be lowered due to the spring back phenomenon.
  • the cold-pressed part is heated to a temperature of AC 3 or more, followed by quenching the cold-pressed part received within dies, which correspond to a final shape of the automobile part.
  • the heat-treatment hardening process S- 14 residual stress caused by cold-pressing is removed and the strength of the automobile part is increased while ensuring dimensional accuracy.
  • FIG. 3 is a flowchart of a method of manufacturing an automobile part having different local strengths using steel sheets subjected to heat-treatment hardening in accordance with a second embodiment of the present invention.
  • FIG. 4 shows an automobile part in each process of the method of manufacturing an automobile part in accordance with the second embodiment.
  • the method according to the second embodiment may be applied to the case where it is difficult to form a final shape through cold-forming.
  • the method of manufacturing an automobile part having different local strengths using steel sheets subjected to heat-treatment hardening includes:
  • blank sheet preparing process S- 21 in which blank sheets are prepared from steel sheets subjected to heat-treatment hardening and having different thicknesses or different mechanical properties according to desired strength;
  • a blank assembly forming process S- 22 in which a blank assembly is formed by joining the blank sheets to each other via laser welding;
  • a heat-treatment hardening/forming process S- 24 in which the cold-pressed part is heated to a temperature of AC 3 or more to form the remaining 1 to 20% of the final shape, followed by quenching the formed automobile part received within dies to remove residual stress while increasing strength of the automobile part.
  • the blank assembly is subjected to cold-pressing to an extent of 80 to 99% of the final shape in the cold-forming process S- 23 , and the final part is formed in the heat-treatment hardening/forming process S- 24 .
  • the ratio of forming is calculated with reference to the thickness of a final product.
  • the ratio of cold-forming is 90%.
  • the blank assembly is not formed to the level of the final part through cold-forming in consideration of the formed limits upon cold-forming of an automobile part which has a substantial forming depth or a complicated shape, as described above.
  • the final process is the heat-treatment hardening process S- 14 in which hot-forming is not performed.
  • the final process is the heat-treatment hardening/forming process S- 24 , in which the remaining 1 to 20% of the final shape is formed by hot-forming the cold-formed part, with the cold-formed part heated to a temperature of AC 3 or more, while quenching the produced part received within dies.
  • the cold-pressed part is heated to form the remaining 1 to 20% of the final shape through hot forming, followed by closing the dies and quenching the formed part to harden the part received within the dies, thereby ensuring dimensional accuracy while improving strength.
  • the welded zone since a laser welded zone of the produced part is also subjected to heat treatment together with the steel sheet, the welded zone has the same microstructure as that of a non-welded zone. As a result, the welded zone is prevented from deterioration in strength.
  • FIG. 5 is a flowchart of a method of manufacturing an automobile part having different local strengths using steel sheets subjected to heat-treatment hardening in accordance with a third embodiment of the present invention.
  • FIG. 6 shows an automobile part in each process of the method of manufacturing an automobile part in accordance with the third embodiment.
  • the method according to the third embodiment includes forming a desired shape of a part through hot-forming.
  • blank sheet preparing process S- 31 in which blank sheets are prepared from steel sheets subjected to heat-treatment hardening and having different thicknesses or different mechanical properties according to desired strength;
  • a blank assembly forming process S- 32 in which a blank assembly is formed by joining the blank sheets to each other via laser welding;
  • a heat-treatment hardening/forming process S- 33 in which the blank assembly is heated to a temperature of AC 3 or more, followed by hot-pressing the blank assembly and quenching the hot-pressed part received within dies to remove residual stress while increasing strength of the automobile part.
  • the blank assembly in the heat-treatment hardening/forming process S- 33 , is heated to a temperature of AC 3 or more, followed by hot-pressing the blank assembly to form a final shape of an automobile part, and quenching the formed part with the dies receiving the part and closed.
  • the blank assembly can be subjected to hot-forming and heat-treatment hardening at the same time.
  • the steel sheets subjected to heat-treatment hardening may include cold-rolled steel sheets which are not subjected to surface treatment.
  • the steel sheets may include steel sheets, which are subjected to at least one surface treatment method selected from among Zn plating, Al plating, Al—Si plating and high temperature oxidizing agent coating.
  • the steel sheet When using the steel sheet subjected to surface treatment, the steel sheet may be heated to 1000° C. or less. When the steel sheet is heated to above 1000° C., a surface plating layer or coating layer can be evaporated from the steel sheet.
  • compositions of steel sheets which are applied to the method according to the present invention, will be described.
  • the steel sheets used in the blank sheet preparing process may include 0.15 to 0.5 percent by weight (wt %) of carbon (C), 0.15 to 0.5 wt % of silicon (Si), 0.5 to 3.0 wt % of manganese (Mn), 0.1 wt % or less of phosphorous (P), 0.1 wt % or less of sulfur (S), 0.01 to 1.0 wt % of chromium (Cr), 0.2 wt % or less of titanium (Ti), 0.1 wt % or less of aluminum (Al), 0.0005 to 0.08 wt % of boron (B), and the balance of Fe and unavoidable impurities.
  • the steel sheet subjected to heat-treatment hardening and having this composition may be used to manufacture a high strength automobile part having a strength of 100 kgf/mm 2 or more.
  • the steel sheets used in the blank sheet preparing process may include 0.15 to 0.4 wt % of carbon (C), 0.03 to 0.4 wt % of silicon (Si), 1.0 to 2.0 wt % of manganese (Mn), 0.12 wt % or less of phosphorous (P), 0.003 wt % or less of sulfur (S), 0.0005 to 0.08 wt % of boron (B), 0.005 to 0.1 wt % of zirconium (Zr), 0.001 to 0.005 wt % of calcium (Ca), and the balance of Fe and unavoidable impurities.
  • C carbon
  • Si silicon
  • Mn manganese
  • P phosphorous
  • S sulfur
  • B 0.0005 to 0.08 wt % of boron
  • Zr zirconium
  • Ca calcium
  • the steel sheet having this composition has high impact resistance due to addition of zirconium and calcium and thus may be applied to manufacture of blank sheets, which will be used for a part requiring high impact resistance.
  • the steel sheets used in the blank sheet preparing process may include 0.15 to 0.30 wt % of carbon (C), 0.05 to 0.5 wt % of silicon (Si), 1.0 to 2.0 wt % of manganese (Mn), 0.0005 to 0.0040 wt % of boron (B), 0.003 wt % or less of sulfur (S), 0.012 wt % or less of phosphorous (P), at least two components selected from among cobalt (Co), zirconium (Zr) and antimony (Sb), and the balance of Fe and unavoidable impurities.
  • the steel sheet according to this embodiment selectively includes at least two of cobalt (Co), zirconium (Zr) and antimony (Sb), instead of titanium (Ti), niobium (Nb), molybdenum (Mo) and chromium (Cr) which can cause cracking of the steel sheet during hot pressing, in order to secure high temperature ductility. Accordingly, the steel sheet according to this embodiment allows pressing at low temperature, thereby enabling reduction of energy while protecting a plating layer of a plated steel sheet or preventing occurrence of oxidation scales on a non-plated steel sheet.
  • the steel sheets used in the blank sheet preparing process may include 0.15 to 0.40 wt % of carbon (C), 0.03 to 0.30 wt % of silicon (Si), 1.0 to 2.0 wt % of manganese (Mn), 0.0005 to 0.004 wt % of boron (B), optionally, at least one of 0.003 wt % or less of sulfur (S), 0.012 wt % or less of phosphorous (P), 0.001 to 0.005 wt % of calcium (Ca), 0.005 to 0.05 wt % of niobium (Nb), 0.005 to 0.1 wt % of zirconium (Zr) and 0.0005 to 0.5 wt % of cobalt (Co), and the balance of Fe and unavoidable impurities.
  • C carbon
  • Si silicon
  • Mn manganese
  • B boron
  • P phosphorous
  • the steel sheets used in the blank sheet preparing process may include 0.19 to 0.40 wt % of carbon (C), 0.5 to 2.5 wt % of manganese (Mn), 0.1 to 0.5 wt % of chromium (Cr), 0.0015 to 0.0040 wt % of boron (B), 0.01 to 0.5 wt % of silicon (Si), 0.05 wt % or less of phosphorous (P), 0.05 wt % or less of sulfur (S), 0.03 wt % or less of aluminum (Al), one or two components selected from among 0.01 to 2 wt % of nickel (Ni), 0.01 to 0.10 wt % of niobium (Nb), 0.01 to 1 wt % of copper (Cu) and 0.01 to 0.20 wt % of molybdenum (Mo),

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Plasma & Fusion (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

Disclosed herein is method of manufacturing an automobile part having different local strengths, more particularly, a method of manufacturing an automobile part using a steel sheet subjected to heat-treatment hardening and having different local thicknesses. The method includes preparing blank sheets using steel sheets subjected to heat-treatment hardening and having different thicknesses or different material properties according to desired strength; forming a blank assembly by joining the blank sheets to each other via laser welding; cold-pressing the blank assembly; and heating the cold-pressed part to a temperature of AC3 or more, followed by quenching the cold-formed part received within dies to remove residual stress while increasing strength of the automobile part.

Description

    TECHNICAL FIELD
  • The present invention relates to a method of manufacturing an automobile part having different local strengths and, more particularly, to a method of manufacturing an automobile part using a steel sheet subjected to heat-treatment hardening and having different local thicknesses.
    • BACKGROUND ART
  • Recently, various attempts have been made to achieve improved fuel efficiency and weight reduction of automobiles through increase in strength of automobile parts.
  • Further, some components of an automobile part may require high strength to satisfy structural characteristics thereof and other components thereof may require high impact resistance. As such, the automobile includes parts having different local strengths (or mechanical properties).
  • Conventionally, when manufacturing an automobile part having different local strengths, a component requiring higher strength is manufactured using a steel sheet subjected to heat-treatment hardening and a component require lower strength is manufactured using a general steel sheet. Then, these components are welded to each other, thereby providing the automobile part.
  • When the component subjected to heat-treatment hardening is welded to the component manufactured using a general steel sheet, a welded zone undergoes reheating and cooling, so that heat treatment effects can disappear. In other words, the welded zone suffers from strength deterioration and can break upon collision of the automobile.
  • In another method, different materials having different thicknesses or strengths are welded to each other to fabricate a blank, which in turn is subjected to cold-forming to fabricate an automobile part.
  • In this method, however, difference in the degree of elastic deformation between the materials having different thicknesses causes dimensional distortion, thereby making it difficult to achieve desired dimensional accuracy.
  • In addition, use of materials having different strengths results in a spring back phenomenon in each of the materials, causing dimensional distortion.
    • DISCLOSURE Technical Problem
  • The present invention is directed to providing an automobile part that is manufactured through a heat-treatment hardening/forming process to prevent residual stress.
  • In addition, the present invention is directed to providing an automobile part that does not suffer from deterioration in strength at a welded zone.
  • Further, the present invention is directed to providing an automobile part that does not suffer from a spring back phenomenon and ensures excellent dimensional accuracy.
    • Technical Solution
  • In accordance with one aspect of the present invention, there is provided a method of manufacturing an automobile part, which includes: preparing blank sheets using steel sheets subjected to heat-treatment hardening and having different thicknesses or different material properties according to desired strength; forming a blank assembly by joining the blank sheets to each other via laser welding; cold-pressing the blank assembly; and heating the cold-pressed part to a temperature of AC3 or more, followed by quenching the cold-pressed part received within dies to remove residual stress while increasing strength of the automobile part.
  • In accordance with another aspect of the present invention, there is provided a method of manufacturing an automobile part, which includes: preparing blank sheets using steel sheets subjected to heat-treatment hardening and having different thicknesses or different material properties according to desired strength; forming a blank assembly by joining the blank sheets to each other via laser welding; cold-pressing the blank assembly to an extent of 80 to 99% of a final shape of an automobile part; and heating the cold-pressed part to a temperature of AC3 or more to form the remaining 1 to 20% of the final shape, followed by quenching the automobile part received within dies to remove residual stress while increasing strength of the automobile part.
  • In accordance with a further aspect of the present invention, there is provided a method of manufacturing an automobile part, which includes: preparing blank sheets using steel sheets subjected to heat-treatment hardening and having different thicknesses or different material properties according to desired strength; forming a blank assembly by joining the blank sheets to each other via laser welding; and heating the blank assembly to a temperature of AC3 or more, followed by hot-pressing the blank assembly and quenching the hot-pressed part received within dies to remove residual stress while increasing strength of the automobile part.
  • The steel sheet may include a non-plated cold-rolled steel sheet or a steel sheet subjected to surface treatment by at least one process selected from among Zn plating, Al plating, Al—Si plating and high temperature oxidizing agent coating.
    • Advantageous Effects
  • In the method of manufacturing an automobile part having different local strengths according to exemplary embodiments, blanks are prepared using a steel sheet subjected to heat-treatment hardening, joined to each other via laser welding, followed by cold-forming and/or hot-forming to have a desired shape and quenching.
  • As a result, the produced part does not suffer from residual stress and has high dimensional accuracy.
  • Further, a laser welded zone of the produced part is also subjected to heat treatment together with the steel sheet matrix, thereby exhibiting the same mechanical properties as those of the steel sheet matrix.
    • DESCRIPTION OF DRAWING
  • FIG. 1 is a flowchart of a method of manufacturing an automobile part having different local strengths using steel sheets subjected to heat-treatment hardening in accordance with a first embodiment of the present invention;
  • FIG. 2 shows an automobile part in each process of the method of manufacturing an automobile part in accordance with the first embodiment of the present invention;
  • FIG. 3 is a flowchart of a method of manufacturing an automobile part having different local strengths using steel sheets subjected to heat-treatment hardening in accordance with a second embodiment of the present invention;
  • FIG. 4 shows an automobile part in each process of the method of manufacturing an automobile part in accordance with the second embodiment of the present invention;
  • FIG. 5 is a flowchart of a method of manufacturing an automobile part having different local strengths using steel sheets subjected to heat-treatment hardening in accordance with a third embodiment of the present invention; and
  • FIG. 6 shows an automobile part in each process of the method of manufacturing an automobile part in accordance with the third embodiment of the present invention.
    •  BEST MODE
  • Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
  • It should be noted that the drawings are not to precise scale and may be exaggerated in thickness of lines or size of components for descriptive convenience and clarity.
  • Furthermore, the terms used herein are defined by taking functions of the present disclosure into account and can be changed according to user or operator's custom or intention.
  • Therefore, definition of the terms should be made according to the overall disclosure set forth herein.
  • FIG. 1 is a flowchart of a method of manufacturing an automobile part having different local strengths using steel sheets subjected to heat-treatment hardening in accordance with a first embodiment of the present invention.
  • FIG. 2 shows an automobile part in each process of the method of manufacturing an automobile part in accordance with the first embodiment.
  • Referring to FIG. 1, a method of manufacturing an automobile part according to this embodiment includes:
  • a blank sheet preparing process S-11 in which blank sheets are prepared from steel sheets subjected to heat-treatment hardening and having different thicknesses according to desired strength;
  • a blank assembly forming process S-12 in which a blank assembly is formed by joining the blank sheets to each other via laser welding;
  • a cold-forming process S-13 in which the blank assembly is subjected to cold-pressing; and
  • a heat-treatment hardening process S-14 in which the cold-pressed part is heated to a temperature of AC3 or more, followed by quenching the cold-pressed part received within dies to remove residual stress while increasing strength of the produced automobile part.
  • FIG. 2 shows a process of manufacturing a side reinforcing structure for an automobile by the method according to the first embodiment.
  • The side reinforcing structure needs to have different local strengths. Furthermore, for reduction in weight of an automobile, it is preferable that a high strength steel sheet used for the automobile be as strong and thin as possible.
  • However, since a general high strength steel sheet has low formability and causes a spring back phenomenon, it is difficult to form a desired shape while ensuring dimensional accuracy by preventing the spring back phenomenon.
  • In the method according to this embodiment, blank sheets are prepared from steel sheets subjected to heat-treatment hardening to have different mechanical properties and different thicknesses, and are joined to each other by laser welding.
  • In the blank sheet preparing process S-11 of the method, the blank sheets corresponding to respective components of an automobile part are prepared from the steel sheets subjected to heat-treatment hardening and having different thicknesses according to desired strength.
  • In the blank assembly forming process S-12, the prepared blank sheets are joined to each other by laser welding to form a blank assembly.
  • In the cold-forming process S-13, the blank assembly is subjected to cold-pressing to form a desired shape of the automobile part. Generally, when cold-pressing is performed, dimensional accuracy of the part can be lowered due to the spring back phenomenon.
  • However, according to this embodiment, in the heat-treatment hardening process S-14 after the cold-forming process S-13, the cold-pressed part is heated to a temperature of AC3 or more, followed by quenching the cold-pressed part received within dies, which correspond to a final shape of the automobile part. As a result, in the heat-treatment hardening process S-14, residual stress caused by cold-pressing is removed and the strength of the automobile part is increased while ensuring dimensional accuracy.
  • FIG. 3 is a flowchart of a method of manufacturing an automobile part having different local strengths using steel sheets subjected to heat-treatment hardening in accordance with a second embodiment of the present invention.
  • FIG. 4 shows an automobile part in each process of the method of manufacturing an automobile part in accordance with the second embodiment.
  • When a part has a complex shape or a substantial forming depth, there is a high likelihood of damage of a steel sheet such as tearing during cold-forming
  • The method according to the second embodiment may be applied to the case where it is difficult to form a final shape through cold-forming.
  • As shown in the drawings, the method of manufacturing an automobile part having different local strengths using steel sheets subjected to heat-treatment hardening includes:
  • a blank sheet preparing process S-21 in which blank sheets are prepared from steel sheets subjected to heat-treatment hardening and having different thicknesses or different mechanical properties according to desired strength;
  • a blank assembly forming process S-22 in which a blank assembly is formed by joining the blank sheets to each other via laser welding;
  • a cold-forming process S-23 in which the blank assembly is subjected to cold-pressing to an extent of 80 to 99% of a final shape of the automobile part; and
  • a heat-treatment hardening/forming process S-24 in which the cold-pressed part is heated to a temperature of AC3 or more to form the remaining 1 to 20% of the final shape, followed by quenching the formed automobile part received within dies to remove residual stress while increasing strength of the automobile part.
  • Since the blank sheet preparing process S-21 and the blank assembly forming process S-22 of the method according to this embodiment are the same as those of the first embodiment, repeated descriptions thereof will be omitted.
  • According to the second embodiment, the blank assembly is subjected to cold-pressing to an extent of 80 to 99% of the final shape in the cold-forming process S-23, and the final part is formed in the heat-treatment hardening/forming process S-24.
  • Since the part has a three-dimensional shape, it is difficult to define the ratio of forming with a certain numerical value. In this embodiment, the ratio of forming is calculated with reference to the thickness of a final product.
  • For example, when a final part has a thickness of 50 mm and a cold-formed part has a thickness of 45 mm, the ratio of cold-forming is 90%.
  • According to this embodiment, the blank assembly is not formed to the level of the final part through cold-forming in consideration of the formed limits upon cold-forming of an automobile part which has a substantial forming depth or a complicated shape, as described above.
  • In the method of the first embodiment described above, the final process is the heat-treatment hardening process S-14 in which hot-forming is not performed.
  • On the other hand, in the method of the second embodiment, the final process is the heat-treatment hardening/forming process S-24, in which the remaining 1 to 20% of the final shape is formed by hot-forming the cold-formed part, with the cold-formed part heated to a temperature of AC3 or more, while quenching the produced part received within dies.
  • That is, in the heat-treatment hardening/forming process S-24, the cold-pressed part is heated to form the remaining 1 to 20% of the final shape through hot forming, followed by closing the dies and quenching the formed part to harden the part received within the dies, thereby ensuring dimensional accuracy while improving strength.
  • In both the first and second embodiments, since a laser welded zone of the produced part is also subjected to heat treatment together with the steel sheet, the welded zone has the same microstructure as that of a non-welded zone. As a result, the welded zone is prevented from deterioration in strength.
  • FIG. 5 is a flowchart of a method of manufacturing an automobile part having different local strengths using steel sheets subjected to heat-treatment hardening in accordance with a third embodiment of the present invention.
  • FIG. 6 shows an automobile part in each process of the method of manufacturing an automobile part in accordance with the third embodiment.
  • Unlike the embodiments described above, the method according to the third embodiment includes forming a desired shape of a part through hot-forming.
  • The method of manufacturing an automobile part having different local strengths according to the third embodiment includes:
  • a blank sheet preparing process S-31 in which blank sheets are prepared from steel sheets subjected to heat-treatment hardening and having different thicknesses or different mechanical properties according to desired strength;
  • a blank assembly forming process S-32 in which a blank assembly is formed by joining the blank sheets to each other via laser welding;
  • a heat-treatment hardening/forming process S-33 in which the blank assembly is heated to a temperature of AC3 or more, followed by hot-pressing the blank assembly and quenching the hot-pressed part received within dies to remove residual stress while increasing strength of the automobile part.
  • Since the blank sheet preparing process S-31 and the blank assembly forming process S-32 of the method according to this embodiment are the same as those of the above embodiments, repeated descriptions thereof will be omitted.
  • According to this embodiment, in the heat-treatment hardening/forming process S-33, the blank assembly is heated to a temperature of AC3 or more, followed by hot-pressing the blank assembly to form a final shape of an automobile part, and quenching the formed part with the dies receiving the part and closed.
  • Accordingly, the blank assembly can be subjected to hot-forming and heat-treatment hardening at the same time.
  • With this method, it is possible to manufacture a high strength automobile part having a strength of 100 kgf/mm2 or more without using a high strength steel sheet having low formability.
  • Next, the steel sheets subjected to heat-treatment hardening according to embodiments of the invention will be described.
  • The steel sheets subjected to heat-treatment hardening may include cold-rolled steel sheets which are not subjected to surface treatment. Alternatively, the steel sheets may include steel sheets, which are subjected to at least one surface treatment method selected from among Zn plating, Al plating, Al—Si plating and high temperature oxidizing agent coating.
  • In the method according to the embodiments described above, when the blank assembly is heated to a temperature of AC3 or more in the heat-treatment hardening process S-14 or in the heat-treatment hardening/forming process S-24 or S-34, carburization or oxidation can occur. To prevent this phenomenon, it is preferable to use the steel sheets subjected to surface treatment as described above.
  • When using the steel sheet subjected to surface treatment, the steel sheet may be heated to 1000° C. or less. When the steel sheet is heated to above 1000° C., a surface plating layer or coating layer can be evaporated from the steel sheet.
  • Next, the compositions of steel sheets, which are applied to the method according to the present invention, will be described.
  • According to one exemplary embodiment, the steel sheets used in the blank sheet preparing process may include 0.15 to 0.5 percent by weight (wt %) of carbon (C), 0.15 to 0.5 wt % of silicon (Si), 0.5 to 3.0 wt % of manganese (Mn), 0.1 wt % or less of phosphorous (P), 0.1 wt % or less of sulfur (S), 0.01 to 1.0 wt % of chromium (Cr), 0.2 wt % or less of titanium (Ti), 0.1 wt % or less of aluminum (Al), 0.0005 to 0.08 wt % of boron (B), and the balance of Fe and unavoidable impurities.
  • The steel sheet subjected to heat-treatment hardening and having this composition may be used to manufacture a high strength automobile part having a strength of 100 kgf/mm2 or more.
  • According to another exemplary embodiment, the steel sheets used in the blank sheet preparing process may include 0.15 to 0.4 wt % of carbon (C), 0.03 to 0.4 wt % of silicon (Si), 1.0 to 2.0 wt % of manganese (Mn), 0.12 wt % or less of phosphorous (P), 0.003 wt % or less of sulfur (S), 0.0005 to 0.08 wt % of boron (B), 0.005 to 0.1 wt % of zirconium (Zr), 0.001 to 0.005 wt % of calcium (Ca), and the balance of Fe and unavoidable impurities.
  • The steel sheet having this composition has high impact resistance due to addition of zirconium and calcium and thus may be applied to manufacture of blank sheets, which will be used for a part requiring high impact resistance.
  • According to still another exemplary embodiment, the steel sheets used in the blank sheet preparing process may include 0.15 to 0.30 wt % of carbon (C), 0.05 to 0.5 wt % of silicon (Si), 1.0 to 2.0 wt % of manganese (Mn), 0.0005 to 0.0040 wt % of boron (B), 0.003 wt % or less of sulfur (S), 0.012 wt % or less of phosphorous (P), at least two components selected from among cobalt (Co), zirconium (Zr) and antimony (Sb), and the balance of Fe and unavoidable impurities.
  • The steel sheet according to this embodiment selectively includes at least two of cobalt (Co), zirconium (Zr) and antimony (Sb), instead of titanium (Ti), niobium (Nb), molybdenum (Mo) and chromium (Cr) which can cause cracking of the steel sheet during hot pressing, in order to secure high temperature ductility. Accordingly, the steel sheet according to this embodiment allows pressing at low temperature, thereby enabling reduction of energy while protecting a plating layer of a plated steel sheet or preventing occurrence of oxidation scales on a non-plated steel sheet.
  • According to still another exemplary embodiment, in order to improve welding and impact properties, the steel sheets used in the blank sheet preparing process may include 0.15 to 0.40 wt % of carbon (C), 0.03 to 0.30 wt % of silicon (Si), 1.0 to 2.0 wt % of manganese (Mn), 0.0005 to 0.004 wt % of boron (B), optionally, at least one of 0.003 wt % or less of sulfur (S), 0.012 wt % or less of phosphorous (P), 0.001 to 0.005 wt % of calcium (Ca), 0.005 to 0.05 wt % of niobium (Nb), 0.005 to 0.1 wt % of zirconium (Zr) and 0.0005 to 0.5 wt % of cobalt (Co), and the balance of Fe and unavoidable impurities.
  • According to still another exemplary embodiment, in order to ensure a tensile strength of 1200˜1500 MPa and good ductility, the steel sheets used in the blank sheet preparing process may include 0.19 to 0.40 wt % of carbon (C), 0.5 to 2.5 wt % of manganese (Mn), 0.1 to 0.5 wt % of chromium (Cr), 0.0015 to 0.0040 wt % of boron (B), 0.01 to 0.5 wt % of silicon (Si), 0.05 wt % or less of phosphorous (P), 0.05 wt % or less of sulfur (S), 0.03 wt % or less of aluminum (Al), one or two components selected from among 0.01 to 2 wt % of nickel (Ni), 0.01 to 0.10 wt % of niobium (Nb), 0.01 to 1 wt % of copper (Cu) and 0.01 to 0.20 wt % of molybdenum (Mo), and the balance of Fe and unavoidable impurities.
  • Although some embodiments have been described herein, it should be understood by those skilled in the art that these embodiments are given by way of illustration only, and that various modifications, variations, and alterations can be made without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be limited only by the following claims and equivalents thereof.

Claims (22)

1-9. (canceled)
10. A method of manufacturing an automobile part, comprising:
preparing blank sheets using steel sheets subjected to heat-treatment hardening and having different thicknesses or different material properties according to desired strength;
forming a blank assembly by joining the blank sheets to each other via laser welding;
cold-pressing the blank assembly; and
heating the cold-pressed part to a temperature of AC3 or more, followed by quenching the cold-pressed part received within dies to remove residual stress while increasing strength of the automobile part.
11. A method of manufacturing an automobile part, comprising:
preparing blank sheets using steel sheets subjected to heat-treatment hardening and having different thicknesses or different material properties according to desired strength;
forming a blank assembly by joining the blank sheets to each other via laser welding;
cold-pressing the blank assembly to an extent of 80 to 99% of a final shape of the automobile part; and
heating the cold-pressed part to a temperature of AC3 or more to form the remaining 1 to 20% of the final shape, followed by quenching the formed automobile part received within dies to remove residual stress while increasing strength of the automobile part.
12. A method of manufacturing an automobile part, comprising:
preparing blank sheets using steel sheets subjected to heat-treatment hardening and having different thicknesses or different material properties according to desired strength;
forming a blank assembly by joining the blank sheets to each other via laser welding; and
heating the blank assembly to a temperature of AC3 or more, followed by hot-pressing the blank assembly and quenching the hot-pressed part received within dies to remove residual stress while increasing strength of the automobile part.
13. The method of claim 10, wherein the steel sheets in preparation of the preparing blank sheets are subjected to surface treatment by at least one process selected from among Zn plating, Al plating, Al—Si plating and high temperature oxidizing agent coating.
14. The method of claim 11, wherein the steel sheets in preparation of the preparing blank sheets are subjected to surface treatment by at least one process selected from among Zn plating, Al plating, Al—Si plating and high temperature oxidizing agent coating.
15. The method of claim 12, wherein the steel sheets in preparation of the preparing blank sheets are subjected to surface treatment by at least one process selected from among Zn plating, Al plating, Al—Si plating and high temperature oxidizing agent coating.
16. The method of claim 10, wherein the steel sheets in preparation of the blank sheets comprise 0.15 to 0.5 wt % of carbon (C), 0.15 to 0.5 wt % of silicon (Si), 0.5 to 3.0 wt % of manganese (Mn), 0.1 wt % or less of phosphorous (P), 0.1 wt % or less of sulfur (S), 0.01 to 1.0 wt % of chromium (Cr), 0.2 wt % or less of titanium (Ti), 0.1 wt % or less of aluminum (Al), 0.0005 to 0.08 wt % of boron (B), and the balance of Fe and unavoidable impurities.
17. The method of claim 11, wherein the steel sheets in preparation of the blank sheets comprise 0.15 to 0.5 wt % of carbon (C), 0.15 to 0.5 wt % of silicon (Si), 0.5 to 3.0 wt % of manganese (Mn), 0.1 wt % or less of phosphorous (P), 0.1 wt % or less of sulfur (S), 0.01 to 1.0 wt % of chromium (Cr), 0.2 wt % or less of titanium (Ti), 0.1 wt % or less of aluminum (Al), 0.0005 to 0.08 wt % of boron (B), and the balance of Fe and unavoidable impurities.
18. The method of claim 12, wherein the steel sheets in preparation of the blank sheets comprise 0.15 to 0.5 wt % of carbon (C), 0.15 to 0.5 wt % of silicon (Si), 0.5 to 3.0 wt % of manganese (Mn), 0.1 wt % or less of phosphorous (P), 0.1 wt % or less of sulfur (S), 0.01 to 1.0 wt % of chromium (Cr), 0.2 wt % or less of titanium (Ti), 0.1 wt % or less of aluminum (Al), 0.0005 to 0.08 wt % of boron (B), and the balance of Fe and unavoidable impurities.
19. The method of claim 10, wherein the steel sheets in preparation of the blank sheets comprise 0.15 to 0.4 wt % of carbon (C), 0.03 to 0.4 wt % of silicon (Si), 1.0 to 2.0 wt % of manganese (Mn), 0.12 wt % or less of phosphorous (P), 0.003 wt % or less of sulfur (S), 0.0005 to 0.08 wt % of boron (B), 0.005 to 0.1 wt % of zirconium (Zr), 0.001 to 0.005 wt % of calcium (Ca), and the balance of Fe and unavoidable impurities.
20. The method of claim 11, wherein the steel sheets in preparation of the blank sheets comprise 0.15 to 0.4 wt % of carbon (C), 0.03 to 0.4 wt % of silicon (Si), 1.0 to 2.0 wt % of manganese (Mn), 0.12 wt % or less of phosphorous (P), 0.003 wt % or less of sulfur (S), 0.0005 to 0.08 wt % of boron (B), 0.005 to 0.1 wt % of zirconium (Zr), 0.001 to 0.005 wt % of calcium (Ca), and the balance of Fe and unavoidable impurities.
21. The method of claim 12, wherein the steel sheets in preparation of the blank sheets comprise 0.15 to 0.4 wt % of carbon (C), 0.03 to 0.4 wt % of silicon (Si), 1.0 to 2.0 wt % of manganese (Mn), 0.12 wt % or less of phosphorous (P), 0.003 wt % or less of sulfur (S), 0.0005 to 0.08 wt % of boron (B), 0.005 to 0.1 wt % of zirconium (Zr), 0.001 to 0.005 wt % of calcium (Ca), and the balance of Fe and unavoidable impurities.
22. The method of claim 10, wherein the steel sheets in preparation of the blank sheets comprise 0.15 to 0.30 wt % of carbon (C), 0.05 to 0.5 wt % of silicon (Si), 1.0 to 2.0 wt % of manganese (Mn), 0.0005 to 0.0040 wt % of boron (B), 0.003 wt % or less of sulfur (S), 0.012 wt % or less of phosphorous (P), at least two components selected from among cobalt (Co), zirconium (Zr) and antimony (Sb), and the balance of Fe and unavoidable impurities.
23. The method of claim 11, wherein the steel sheets in preparation of the blank sheets comprise 0.15 to 0.30 wt % of carbon (C), 0.05 to 0.5 wt % of silicon (Si), 1.0 to 2.0 wt % of manganese (Mn), 0.0005 to 0.0040 wt % of boron (B), 0.003 wt % or less of sulfur (S), 0.012 wt % or less of phosphorous (P), at least two components selected from among cobalt (Co), zirconium (Zr) and antimony (Sb), and the balance of Fe and unavoidable impurities.
24. The method of claim 12, wherein the steel sheets in preparation of the blank sheets comprise 0.15 to 0.30 wt % of carbon (C), 0.05 to 0.5 wt % of silicon (Si), 1.0 to 2.0 wt % of manganese (Mn), 0.0005 to 0.0040 wt % of boron (B), 0.003 wt % or less of sulfur (S), 0.012 wt % or less of phosphorous (P), at least two components selected from among cobalt (Co), zirconium (Zr) and antimony (Sb), and the balance of Fe and unavoidable impurities.
25. The method of claim 10, wherein the steel sheets in preparation of the blank sheets comprise 0.15 to 0.40 wt % of carbon (C), 0.03 to 0.30 wt % of silicon (Si), 1.0 to 2.0 wt % of manganese (Mn), 0.0005 to 0.004 wt % of boron (B), optionally, at least one of 0.003 wt % or less of sulfur (S), 0.012 wt % or less of phosphorous (P), 0.001 to 0.005 wt % of calcium (Ca), 0.005 to 0.05 wt % of niobium (Nb), 0.005 to 0.1 wt % of zirconium (Zr) and 0.0005 to 0.5 wt % of cobalt (Co), and the balance of Fe and unavoidable impurities.
26. The method of claim 11, wherein the steel sheets in preparation of the blank sheets comprise 0.15 to 0.40 wt % of carbon (C), 0.03 to 0.30 wt % of silicon (Si), 1.0 to 2.0 wt % of manganese (Mn), 0.0005 to 0.004 wt % of boron (B), optionally, at least one of 0.003 wt % or less of sulfur (S), 0.012 wt % or less of phosphorous (P), 0.001 to 0.005 wt % of calcium (Ca), 0.005 to 0.05 wt % of niobium (Nb), 0.005 to 0.1 wt % of zirconium (Zr) and 0.0005 to 0.5 wt % of cobalt (Co), and the balance of Fe and unavoidable impurities.
27. The method of claim 12, wherein the steel sheets in preparation of the blank sheets comprise 0.15 to 0.40 wt % of carbon (C), 0.03 to 0.30 wt % of silicon (Si), 1.0 to 2.0 wt % of manganese (Mn), 0.0005 to 0.004 wt % of boron (B), optionally, at least one of 0.003 wt % or less of sulfur (S), 0.012 wt % or less of phosphorous (P), 0.001 to 0.005 wt % of calcium (Ca), 0.005 to 0.05 wt % of niobium (Nb), 0.005 to 0.1 wt % of zirconium (Zr) and 0.0005 to 0.5 wt % of cobalt (Co), and the balance of Fe and unavoidable impurities.
28. The method of claim 10, wherein the steel sheets in preparation of the blank sheets comprise 0.19 to 0.40 wt % of carbon (C), 0.5 to 2.5 wt % of manganese (Mn), 0.1 to 0.5 wt % of chromium (Cr), 0.0015 to 0.0040 wt % of boron (B), 0.01 to 0.5 wt % of silicon (Si), 0.05 wt % or less of phosphorous (P), 0.05 wt % or less of sulfur (S), 0.03 wt % or less of aluminum (Al), one or two components selected from among 0.01 to 2 wt % of nickel (Ni), 0.01 to 0.10 wt % of niobium (Nb), 0.01 to 1 wt % of copper (Cu) and 0.01 to 0.20 wt % of molybdenum (Mo), and the balance of Fe and unavoidable impurities.
29. The method of claim 11, wherein the steel sheets in preparation of the blank sheets comprise 0.19 to 0.40 wt % of carbon (C), 0.5 to 2.5 wt % of manganese (Mn), 0.1 to 0.5 wt % of chromium (Cr), 0.0015 to 0.0040 wt % of boron (B), 0.01 to 0.5 wt % of silicon (Si), 0.05 wt % or less of phosphorous (P), 0.05 wt % or less of sulfur (S), 0.03 wt % or less of aluminum (Al), one or two components selected from among 0.01 to 2 wt % of nickel (Ni), 0.01 to 0.10 wt % of niobium (Nb), 0.01 to 1 wt % of copper (Cu) and 0.01 to 0.20 wt % of molybdenum (Mo), and the balance of Fe and unavoidable impurities.
30. The method of claim 12, wherein the steel sheets in preparation of the blank sheets comprise 0.19 to 0.40 wt % of carbon (C), 0.5 to 2.5 wt % of manganese (Mn), 0.1 to 0.5 wt % of chromium (Cr), 0.0015 to 0.0040 wt % of boron (B), 0.01 to 0.5 wt % of silicon (Si), 0.05 wt % or less of phosphorous (P), 0.05 wt % or less of sulfur (S), 0.03 wt % or less of aluminum (Al), one or two components selected from among 0.01 to 2 wt % of nickel (Ni), 0.01 to 0.10 wt % of niobium (Nb), 0.01 to 1 wt % of copper (Cu) and 0.01 to 0.20 wt % of molybdenum (Mo), and the balance of Fe and unavoidable impurities.
US13/390,537 2010-11-03 2010-11-08 Automobile part manufacturing method using quenched steel sheet Abandoned US20120216920A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1020100108528A KR101033767B1 (en) 2010-11-03 2010-11-03 Method for manufacturing automotive parts with locally dissimilar strength using heat-treated hardened steel sheet
KR10-2010-0108528 2010-11-03
PCT/KR2010/007829 WO2012060496A1 (en) 2010-11-03 2010-11-08 Method for manufacturing automobile part having different local strengths using heat-treatment hardening steel plate

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2010/007829 A-371-Of-International WO2012060496A1 (en) 2010-11-03 2010-11-08 Method for manufacturing automobile part having different local strengths using heat-treatment hardening steel plate

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US14/630,390 Division US20150167111A1 (en) 2010-11-03 2015-02-24 Automobile part manufacturing method using quenched steel sheet

Publications (1)

Publication Number Publication Date
US20120216920A1 true US20120216920A1 (en) 2012-08-30

Family

ID=44365822

Family Applications (2)

Application Number Title Priority Date Filing Date
US13/390,537 Abandoned US20120216920A1 (en) 2010-11-03 2010-11-08 Automobile part manufacturing method using quenched steel sheet
US14/630,390 Abandoned US20150167111A1 (en) 2010-11-03 2015-02-24 Automobile part manufacturing method using quenched steel sheet

Family Applications After (1)

Application Number Title Priority Date Filing Date
US14/630,390 Abandoned US20150167111A1 (en) 2010-11-03 2015-02-24 Automobile part manufacturing method using quenched steel sheet

Country Status (6)

Country Link
US (2) US20120216920A1 (en)
EP (1) EP2636759B1 (en)
JP (1) JP5509337B2 (en)
KR (1) KR101033767B1 (en)
CN (1) CN102712962B (en)
WO (1) WO2012060496A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140327272A1 (en) * 2013-05-02 2014-11-06 Volvo Car Corporation Method for creating a hardened steel assembly
EP3342498A1 (en) * 2016-12-09 2018-07-04 MS Autotech Co., Ltd. Method for manufacturing vehicle body parts
EP3279354A4 (en) * 2015-03-31 2018-10-03 Futaba Industrial Co., Ltd. Laser welding steel and laser welded joint
US11097329B2 (en) 2015-12-09 2021-08-24 Arcelormittal Method for producing an inner automotive structural part comprising localized reinforced areas
US12311427B2 (en) 2020-02-26 2025-05-27 Nippon Steel Corporation Method of manufacturing overlapped hot stamp molded body, and overlapped hot stamp molded body

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101330952B1 (en) * 2011-06-28 2013-11-18 현대제철 주식회사 Hot stamping molding product and method of manufacturing the same
CN103534372B (en) * 2011-06-30 2016-02-10 现代制铁株式会社 The heat embrittlement steel that crash-worthiness is excellent and use it to manufacture the method for heat embrittlement parts
KR101119173B1 (en) * 2011-09-30 2012-02-22 현대하이스코 주식회사 Method for manufacturing steel products having different strength using laser heat treatment and heat treated hardened steel used therein
KR101205334B1 (en) * 2012-04-16 2012-11-26 (주)오토젠 Method for manufacturing shassis of vehicle
KR101542969B1 (en) * 2013-09-04 2015-08-07 현대자동차 주식회사 Blank forming device using electric direct heating method and the manufacturing method using this
KR20170030551A (en) * 2014-07-16 2017-03-17 보르그워너 인코퍼레이티드 Adjustment ring assembly for variable turbine geometry turbochargers
CN104708274A (en) * 2015-02-02 2015-06-17 柳州市二和汽车零部件有限公司 Surface hardening method of automobile parts
CN104985412A (en) * 2015-08-02 2015-10-21 衢州市优德工业设计有限公司 Machining method of multi-layer gear
WO2017029773A1 (en) * 2015-08-19 2017-02-23 Ｊｆｅスチール株式会社 Method for manufacturing hot press part and hot press part
KR101707340B1 (en) * 2015-12-28 2017-02-15 현대제철 주식회사 Chain steel and manufacturing method thereof
CN106566998B (en) * 2016-10-13 2018-07-24 宝钢特钢韶关有限公司 CrMo series gear round steel
CN107723619A (en) * 2017-10-31 2018-02-23 浠讳附 A kind of heat treatment method of boiler heat-resistant component
CN108581372B (en) * 2018-04-02 2020-05-22 无锡奇科穆德机电科技有限公司 Thin steel plate slotting machining process
KR20220151457A (en) * 2021-05-06 2022-11-15 현대자동차주식회사 Ultra high strength cold rolled galvanized steel and forming method for the same
JP7656249B2 (en) * 2023-04-28 2025-04-03 日本製鉄株式会社 Blank, manufacturing method of structural member, and structural member
CN121001833A (en) * 2023-04-28 2025-11-21 日本制铁株式会社 Blank, method for producing structural component, and structural component
WO2024225327A1 (en) * 2023-04-28 2024-10-31 日本製鉄株式会社 Blank, method for manufacturing structural member, and structural member
WO2024225331A1 (en) * 2023-04-28 2024-10-31 日本製鉄株式会社 Blank, method for producing structural member, and structural member
WO2024253077A1 (en) * 2023-06-06 2024-12-12 日本製鉄株式会社 Blank, method for manufacturing structural member, and structural member

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2827874B1 (en) * 2001-07-27 2004-05-21 Usinor PROCESS FOR MANUFACTURING VERY HIGH MECHANICAL STRENGTH AND EXCELLENT PLANEITY STEEL PARTS
JP4316842B2 (en) * 2002-07-26 2009-08-19 アイシン高丘株式会社 Method for manufacturing tailored blank press molded products
WO2004033126A1 (en) * 2002-09-13 2004-04-22 Daimlerchrysler Ag Press-hardened part and method for the production thereof
JP4280078B2 (en) * 2003-01-24 2009-06-17 新日本製鐵株式会社 High-strength cold-rolled steel sheet and plated steel sheet excellent in deep drawability, steel pipes excellent in workability, and production methods thereof
DE10333166A1 (en) * 2003-07-22 2005-02-10 Daimlerchrysler Ag Press-hardened component and method for producing a press-hardened component
JP2005138112A (en) * 2003-11-04 2005-06-02 Nippon Steel Corp Press working method
DE102004038626B3 (en) * 2004-08-09 2006-02-02 Voestalpine Motion Gmbh Method for producing hardened components from sheet steel
JP4975245B2 (en) * 2004-10-06 2012-07-11 新日本製鐵株式会社 Manufacturing method of high strength parts
JP4867319B2 (en) * 2005-12-05 2012-02-01 住友金属工業株式会社 Tailored blank material for hot pressing, hot pressing member and manufacturing method thereof
JP4840089B2 (en) * 2006-11-08 2011-12-21 住友金属工業株式会社 Manufacturing method of molded products
JP5070947B2 (en) * 2007-06-14 2012-11-14 住友金属工業株式会社 Hardened steel plate member, hardened steel plate and manufacturing method thereof
DE102008022399A1 (en) * 2008-05-06 2009-11-19 Thyssenkrupp Steel Ag Process for producing a steel molding having a predominantly ferritic-bainitic structure
KR100902857B1 (en) * 2008-10-16 2009-06-16 현대하이스코 주식회사 Manufacturing method of ultra high strength steel molded body for the manufacture of moldings with complex shapes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Diekmann et al. "Air-Hardening, High-Strength Steels for more Crash Safety" ATZ worldwide, December 2007, Volume 109, Issue 12, pp 6-8 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140327272A1 (en) * 2013-05-02 2014-11-06 Volvo Car Corporation Method for creating a hardened steel assembly
US9309581B2 (en) * 2013-05-02 2016-04-12 Volvo Car Corporation Method for creating a hardened steel assembly
EP3279354A4 (en) * 2015-03-31 2018-10-03 Futaba Industrial Co., Ltd. Laser welding steel and laser welded joint
US11097329B2 (en) 2015-12-09 2021-08-24 Arcelormittal Method for producing an inner automotive structural part comprising localized reinforced areas
EP3342498A1 (en) * 2016-12-09 2018-07-04 MS Autotech Co., Ltd. Method for manufacturing vehicle body parts
US12311427B2 (en) 2020-02-26 2025-05-27 Nippon Steel Corporation Method of manufacturing overlapped hot stamp molded body, and overlapped hot stamp molded body

Also Published As

Publication number Publication date
KR101033767B1 (en) 2011-05-09
US20150167111A1 (en) 2015-06-18
EP2636759A4 (en) 2015-06-10
EP2636759A1 (en) 2013-09-11
WO2012060496A1 (en) 2012-05-10
CN102712962B (en) 2017-05-24
JP5509337B2 (en) 2014-06-04
JP2013501631A (en) 2013-01-17
CN102712962A (en) 2012-10-03
EP2636759B1 (en) 2019-06-05

Similar Documents

Publication Publication Date Title
US20120216920A1 (en) Automobile part manufacturing method using quenched steel sheet
KR101108838B1 (en) Heat-treated hardened steel with excellent impact performance and method of manufacturing heat-hardened component using the same
CN107614733B (en) HPF molded part having excellent peeling resistance and method for producing same
US10435763B2 (en) Method for producing a cold-rolled flat steel product with high yield strength and flat cold-rolled steel product
US20110182765A1 (en) Use of a steel alloy
KR101330952B1 (en) Hot stamping molding product and method of manufacturing the same
JP2017512247A (en) Steel plate products, steel parts manufactured from these steel plate products, and automobile bodies
CN111527222B (en) Cladding Steel Plate
KR20140119811A (en) Process for producing press-formed product and press-formed product
JP4990500B2 (en) High-strength automotive member excellent in uniformity of internal hardness and manufacturing method thereof
CN106141433A (en) The method manufacturing tailor welded
CN108025349B (en) Method for producing molded body
CN105849305A (en) Steel sheet for hot press forming with excellent corrosion resistance and weldability, forming member, and manufacturing method therefor
WO2017169588A1 (en) Mechanical clinch joining component and method for manufacturing same
CN109562637A (en) Chassis assembly with high operation intensity
JP5258642B2 (en) Automobile undercarriage parts with unusual cross-sectional shape with excellent fatigue characteristics
JP4427462B2 (en) Steel member for vehicle and method for manufacturing the same
JP2020519765A (en) Hot forming materials, components, and uses
JP4266383B2 (en) Cold mold steel and molds
KR20120132836A (en) Hot stamping molding product and method of manufacturing the same
WO2008047806A1 (en) Cold work die steel, die, and method for production of cold work die steel
KR20180123492A (en) High strength air-hardened steel for use as a filler
JP7461464B2 (en) Steel plate for hot forming, hot forming member and manufacturing method thereof
JP2015196890A (en) Hot stamp molded body
KR101333971B1 (en) Steel product with various strength using galvanized steel sheet for hot stamping and method of manufacturing the same

Legal Events

Date Code Title Description
AS Assignment

Owner name: HYUNDAI HYSCO, KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NAM, SEUNG-MAN;CHAE, SU-HONG;KWON, MIN-SUCK;AND OTHERS;REEL/FRAME:027753/0264

Effective date: 20120130

AS Assignment

Owner name: HYUNDAI STEEL COMPANY, KOREA, REPUBLIC OF

Free format text: MERGER;ASSIGNOR:HYUNDAI HYSCO CO., LTD.;REEL/FRAME:037325/0070

Effective date: 20150701

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION