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EP0820529A1 - Procede de fabrication de produits allonges finis a chaud, notamment du type barre ou tube, en acier fortement allie ou hypereutectoide - Google Patents

Procede de fabrication de produits allonges finis a chaud, notamment du type barre ou tube, en acier fortement allie ou hypereutectoide

Info

Publication number
EP0820529A1
EP0820529A1 EP96907260A EP96907260A EP0820529A1 EP 0820529 A1 EP0820529 A1 EP 0820529A1 EP 96907260 A EP96907260 A EP 96907260A EP 96907260 A EP96907260 A EP 96907260A EP 0820529 A1 EP0820529 A1 EP 0820529A1
Authority
EP
European Patent Office
Prior art keywords
temperature
rolling
forming
cooling
mill
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.)
Granted
Application number
EP96907260A
Other languages
German (de)
English (en)
Other versions
EP0820529B1 (fr
Inventor
Heinz Kron
Karlheinz Kutzenberger
Günther Manig
Gustav Zouhar
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0820529A1 publication Critical patent/EP0820529A1/fr
Application granted granted Critical
Publication of EP0820529B1 publication Critical patent/EP0820529B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • 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
    • C21D1/26—Methods of annealing
    • C21D1/32—Soft annealing, e.g. spheroidising
    • 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
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • 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
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • 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
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/003—Cementite
    • 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

Definitions

  • the coordinated process steps make it possible to produce the desired structure, with a Brinell hardness of less than or equal to 280 HB30, preferably less than 250 HB30, being achieved in the case of rolling bearing steel.
  • This structure also makes it possible, for example, to supply hot-worked pipes directly to processing without soft annealing.
  • the optimized manufacturing process is particularly cost-effective because the soft annealing and the associated transport and work steps are eliminated.
  • the processing of the invention hot-formed elongated products can be cold drawing or cold pilgering or cold rolling or cross-rolling.
  • the actual reheating takes place to a temperature either below Ac-i but above 650 ° C or above Ac-
  • however below Ac ma (a beginning of the area of carbide dissolution).
  • the Ac -) or Ac ma temperature is primarily dependent on the carbon content of the material quality used and on the history of forming.
  • the former temperature range corresponds to the two-phase region + F ⁇ ßC in the continuous time-temperature conversion diagram (ZTU), the latter region corresponds to the two-phase region + F ⁇ 3C.
  • Another measure for the proposed combination of coordinated process steps relates to the final continuous rolling process, preferably in the stretch-reducing mill. In contrast to other rolling processes, the intervention possibilities in this fast-running continuous rolling process are low.
  • the temperature of the rolled stock must not exceed A cma .
  • This narrow temperature range can be maintained by means of a controlled coolant control in special cases, heat supply by means of an external heating device, and by varying the roller geometry, the roller speed and the stitch take-off. With the roller geometry, the pressed length is of particular importance.
  • the method according to the invention can generally be used for all known tube production methods which in the end have a reducing roller mill with or without a train or sizing roller.
  • this can be a process on a tube mill line, stopper line or an Assel mill.
  • It is particularly suitable for the push bench process for the production of seamless tubes from roller bearing steel.
  • Block casting (forged or rolled) or continuous casting (square or round) can be used as the starting material for the process according to the invention, the continuous casting material being deformed and annealed in a known manner before the rolling insert.
  • the method can be used particularly advantageously if the chemical analysis of the roller bearing steel known per se is modified.
  • the chromium to carbon ratio should be in the range between 1.35 and 1.52, preferably at 1.45.
  • the carbon content is then, for example, 0.94 percent by mass and the chromium content is approximately 1.36 percent by mass.
  • the undesired carbide rate can be positively influenced by this ratio.
  • Another improvement is the cooling process after the last forming process.
  • the rolling stock After leaving the rolling mill, the rolling stock is cooled in still air or by means of an air shower to a temperature that corresponds to a structure in the ZTU diagram that lies above the martensite point and below the nose of the bainite.
  • the formed material is kept isothermal for several hours in this area. This procedure has proven to be beneficial in terms of reducing the residual stresses. In plant terms, this can be done in such a way that the cooling bed is heat-insulating at a suitable point, for example covered or the rolling stock is fed to a temperature compensation or tempering furnace.
  • the rolling stock running out of the rolling mill has a higher rigidity due to the reduced forming temperature and becomes sufficiently straight on the cooling bed. Straightening can therefore generally be omitted.
  • the hole piece has the following dimensions
  • the temperature of the slug drops further until the pull-out duo and reaches a level in the range of 650 to 700 ° C in the aforementioned case.
  • the slug bottom is scooped.
  • controlled cooling prior to the entry of the slug into the reheating device, it is subjected to controlled cooling in order to achieve a uniform temperature distribution in the range between 650 ° C. and 700 ° C. In this case, a temperature level of approx. 670 ° C is aimed for.
  • the slugs are held for a certain time by means of a heat-insulated buffer, so that heat can flow from the areas of the slug with a higher temperature level to the areas with a low temperature level.
  • the thermal insulation ensures that the overall level of the bobbin temperature does not drop below the specified target value.
  • the temperature of the reheating furnace is set so that the temperature of the material to be formed is approximately 740 ° C.
  • the billet enters a stretch-reducing mill. This consists of a large number of three-roll stands, which are each offset by 120 ° in a rolling line. 19 frames are used for the selected example with the final dimensions of 40.9 x 4.8 mm.
  • the partial forming in the basic scaffolding is estimated to be between 7.1 and 8.1% decrease in cross-section. The total deformation is 72.7% corresponding to an elongation of 3.66. The forming conditions are chosen such. B.
  • the tube produced according to the procedure according to the invention can be further processed without cutting or without additional heat treatment. For example, this can be cold drawing. Due to the selected procedure, targeted temperature control before entering the reheating oven - lowered temperature of the reheating oven compared to the usual mode of operation

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Steel (AREA)
  • Metal Rolling (AREA)
  • Metal Extraction Processes (AREA)

Abstract

Selon le procédé proposé, une longueur du matériau à cémenter choisi est chauffée à température de formage, puis, après une ou plusieurs opérations de formage, réchauffée à une température de formage inférieure à la première et, par laminage constant à l'aide d'un laminoir réducteur à plusieurs cages, formée à sa dimension définitive et refroidie par exposition à de l'air statique. L'invention est caractérisée en ce que, après les premières opérations de formage et avant le réchauffement, par un système de chauffe et de refroidissement réglé à une température préétablie dans les limites d'une certaine plage de températures, on obtient un produit intermédiaire qui a été exposé, dans sa longueur et son épaisseur, à une température uniformément répartie.
EP96907260A 1995-04-03 1996-03-12 Procede de fabrication de produits allonges finis a chaud, notamment du type barre ou tube, en acier fortement allie ou hypereutectoide Expired - Lifetime EP0820529B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19513314 1995-04-03
DE19513314A DE19513314C2 (de) 1995-04-03 1995-04-03 Verfahren zur Herstellung eines warmgefertigten langgestreckten Erzeugnisses, insbesondere Stab oder Rohr, aus übereutektoidem Stahl
PCT/DE1996/000501 WO1996031628A1 (fr) 1995-04-03 1996-03-12 Procede de fabrication de produits allonges finis a chaud, notamment du type barre ou tube, en acier fortement allie ou hypereutectoide

Publications (2)

Publication Number Publication Date
EP0820529A1 true EP0820529A1 (fr) 1998-01-28
EP0820529B1 EP0820529B1 (fr) 2000-08-02

Family

ID=7759207

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96907260A Expired - Lifetime EP0820529B1 (fr) 1995-04-03 1996-03-12 Procede de fabrication de produits allonges finis a chaud, notamment du type barre ou tube, en acier fortement allie ou hypereutectoide

Country Status (14)

Country Link
US (1) US5958158A (fr)
EP (1) EP0820529B1 (fr)
JP (1) JPH11503491A (fr)
KR (1) KR19980703575A (fr)
AR (1) AR001416A1 (fr)
BR (1) BR9604830A (fr)
CA (1) CA2217309C (fr)
CZ (1) CZ304797A3 (fr)
DE (2) DE19513314C2 (fr)
ES (1) ES2149455T3 (fr)
HU (1) HUP9800702A3 (fr)
PL (1) PL322598A1 (fr)
SK (1) SK134297A3 (fr)
WO (1) WO1996031628A1 (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE510447C2 (sv) * 1998-03-16 1999-05-25 Ovako Steel Ab Sätt för mjukglödgning av högkolhaltigt stål
NL1007739C2 (nl) * 1997-12-08 1999-06-09 Hoogovens Staal Bv Werkwijze en inrichting voor het vervaardigen van een stalen band met hoge sterkte.
US6233500B1 (en) * 1997-06-19 2001-05-15 The United States Of America As Represented By The Secretary Of The Air Force Optimization and control of microstructure development during hot metal working
DE19734563C1 (de) * 1997-08-04 1998-12-03 Mannesmann Ag Verfahren zur Herstellung von Wälzlagerringen aus Stahl
US6936119B2 (en) * 2000-07-12 2005-08-30 Mannesmannrohren-Werke Ag Method for producing metallic, non-rotationally symmetrical rings with a constant wall thickness over their circumference
DE10134776C2 (de) * 2000-07-12 2003-04-24 Mannesmann Roehren Werke Ag Verfahren zur Herstellung metallischer nicht-rotationssymmetrischer Ringe mit über den Umfang konstanter Wanddicke, sowie Vorrichtung zur Durchführung des Verfahrens
DE102004011021A1 (de) * 2004-03-04 2005-09-29 Mannesmannröhren-Werke Ag Verfahren zur Herstellung eines Formteils aus übereutekoidem Stahl
JP4894855B2 (ja) 2006-03-28 2012-03-14 住友金属工業株式会社 継目無管の製造方法
US8968495B2 (en) * 2007-03-23 2015-03-03 Dayton Progress Corporation Methods of thermo-mechanically processing tool steel and tools made from thermo-mechanically processed tool steels
US9132567B2 (en) * 2007-03-23 2015-09-15 Dayton Progress Corporation Tools with a thermo-mechanically modified working region and methods of forming such tools
CN101722190B (zh) * 2009-11-12 2012-08-22 无锡西姆莱斯石油专用管制造有限公司 一种热轧毛管的处理工艺
DE102011051682B4 (de) * 2011-07-08 2013-02-21 Max Aicher Verfahren und Vorrichtung zum Behandeln eines Stahlprodukts sowie Stahlprodukt
PL232555B1 (pl) * 2017-05-25 2019-06-28 Arcelormittal Poland Spolka Akcyjna Sposób produkcji walcówki gładkiej i żebrowanej
CN115612802A (zh) * 2022-10-25 2023-01-17 本钢板材股份有限公司 一种小规格轴承钢生产等温球化退火工艺
CN117305564A (zh) * 2023-09-06 2023-12-29 南京钢铁股份有限公司 一种导轨用钢降低硬度的生产控制方法
CN120493572B (zh) * 2025-07-10 2025-11-28 承德建龙特殊钢有限公司 钢管连轧削尖参数优化方法、装置、电子设备及存储介质

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6417820A (en) * 1987-07-13 1989-01-20 Kobe Steel Ltd Production of electric resistance welded steel tube for heat treatment
JP3215891B2 (ja) * 1991-06-14 2001-10-09 新日本製鐵株式会社 冷間加工用棒鋼線材の製造方法
JP2544867B2 (ja) * 1992-04-21 1996-10-16 新日本製鐵株式会社 過共析鋼線材の製造方法
DE59310023D1 (de) * 1992-09-02 2000-06-08 Sulzer Orthopaedie Ag Baar Zweiteilige Hüftgelenkpfanne

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9631628A1 *

Also Published As

Publication number Publication date
EP0820529B1 (fr) 2000-08-02
DE59605681D1 (de) 2000-09-07
HUP9800702A3 (en) 1999-08-30
DE19513314A1 (de) 1996-10-10
WO1996031628A1 (fr) 1996-10-10
JPH11503491A (ja) 1999-03-26
SK134297A3 (en) 1998-04-08
BR9604830A (pt) 1999-01-05
PL322598A1 (en) 1998-02-02
AR001416A1 (es) 1997-10-22
ES2149455T3 (es) 2000-11-01
CZ304797A3 (cs) 1998-04-15
US5958158A (en) 1999-09-28
CA2217309C (fr) 2000-11-21
DE19513314C2 (de) 1997-07-03
HUP9800702A2 (hu) 1998-07-28
KR19980703575A (ko) 1998-11-05
CA2217309A1 (fr) 1996-10-10

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