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EP0211681B1 - Procédé pour recuire en continu un acier en teneur extra-basse en carbone pour emboutissage profond - Google Patents

Procédé pour recuire en continu un acier en teneur extra-basse en carbone pour emboutissage profond Download PDF

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Publication number
EP0211681B1
EP0211681B1 EP86306234A EP86306234A EP0211681B1 EP 0211681 B1 EP0211681 B1 EP 0211681B1 EP 86306234 A EP86306234 A EP 86306234A EP 86306234 A EP86306234 A EP 86306234A EP 0211681 B1 EP0211681 B1 EP 0211681B1
Authority
EP
European Patent Office
Prior art keywords
temperature
heating
low carbon
zone
carbon steel
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.)
Expired - Lifetime
Application number
EP86306234A
Other languages
German (de)
English (en)
Other versions
EP0211681A2 (fr
EP0211681A3 (en
Inventor
Takashi c/o Kawasaki Steel Corp. Obara
Kazunori c/o Kawasaki Steel Corp. Osawa
Susumu c/o Kawasaki Steel Corp. Satoh
Kozou c/o Kawasaki Steel Corp. Tsunoyama
Toshikazu c/o Kawasaki Steel Corp. Kaihara
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.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
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 Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to AT86306234T priority Critical patent/ATE103011T1/de
Publication of EP0211681A2 publication Critical patent/EP0211681A2/fr
Publication of EP0211681A3 publication Critical patent/EP0211681A3/en
Application granted granted Critical
Publication of EP0211681B1 publication Critical patent/EP0211681B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • 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
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets

Definitions

  • This invention relates to a method for continuously annealing an extra-low carbon steel for deep drawing. More particularly, it relates to a method which optimises the excellent mechanical properties of extra-low carbon steel by considering the heating phase as being of prime importance in furnace structure instead of the conventional view in which the most important section is the cooling zone.
  • DE-OS-2942338 discloses a method of producing non-ageing cold rolled steel strip having excellent deep-drawability from low carbon Al-killed steels.
  • the non-ageing cold-rolled steel is obtained by a continuous heat-treatment which does not require an over-ageing treatment. It is, however, essential to soak the strip at a temperature in the range from 680°C to 900°C prior to cooling.
  • US-A-3385946 is concerned with the initial heating stage in a continuous annealing process and discloses a method for continuous annealing a low carbon steel tinplate strip.
  • the strip is heated to a temperature which is below its recrystallisation temperature.
  • a rapid heating means is then employed to perform the final heating of the strip to the annealing temperature (which is above its recrystallisation temperature) in the final stages associates with the annealing of the strip.
  • the cooling portion in all the existing continuous annealing equipment for the production of deep drawable steel sheets is a rate-determining portion of the equipment.
  • the operation and control processes thereof are planned so as to preferentially achieve the desired cooling conditions.
  • the aforementioned cold rolled sheet (of 0.8 mm final gauge) was heated to various temperatures at a heating rate of 35°C/sec and rapidly cooled at a cooling rate of 30°C/sec. Thereafter the r-values (Lankford value) were measured and the results are shown in Fig. 3. As seen from Fig. 3, the r-value tends to increase as the annealing temperature rises in the case of low carbon steel, but the change of r-value is not so large. However, when the annealing temperature reaches 850°C, the growth of austenite phase increases to obstruct the growth of crystal grains and hence the r-value tends to decrease. On the contrary, the r-value tends to considerably increase as the annealing temperature rises in the case of extra-low carbon steel.
  • a method of continuously annealing sheet material of extra-low carbon steel for deep drawing comprising the steps of heating and cooling the sheet material wherein the sheet material is heated from room temperature to a temperature above its recrystallisation temperature, the temperature of the heated sheet is regulated by rapid heating to a desired maximum temperature, said maximum temperature being determined by the steel composition, within an accuracy of ⁇ 10°C, rapidly cooled without soaking after reaching said maximum temperature and the rapidly-cooled sheet material is finally cooled to room temperature.
  • the apparatus used in the present invention is largely different from the conventional apparatus shown in Fig. 4 in that the overaging zone is omitted and a temperature regulating zone is provided instead of the soaking zone.
  • it is intended to positively control the temperature while heating the steel sheet in the temperature regulating zone, so that the temperature regulating zone is required to have a fairly large heating capacity and a good response.
  • the heating capacity per unit length of steel sheet in the temperature regulating zone is necessary to be larger than that of the heating zone or preheating zone.
  • the temperature accuracy is at least ⁇ 10°C even at a non-steady portion.
  • a means for directly blowing a high-temperature non-oxidizing gas to the steel sheet, a means for directly heating the steel sheet by application of current, a means for using a radiant tube at a temperature higher than that usually used and so on are adopted to the temperature regulating zone.
  • the temperature regulating zone has the function of correcting the control of mechanical properties and change of components by the annealing temperature, or the function of correcting the temperature of the steel sheet by the sheet travelling speed or change of sheet gauge, whereby the intended maximum temperature of steel sheet can be controlled with good precision.
  • the feature that the steel sheet is partially cooled in the course of the heating is effective for achieving the object of the invention.
  • the steel sheet After the steel sheet is heated to the intended maximum temperature in the temperature regulating zone as shown in symbols (i), (ii), (iii) or (iv) of Fig. 1a, it is rapidly cooled without passing through the overaging zone.
  • a gas jet cooling, roll cooling or a combination thereof is suitable as a cooling means.
  • consideration of the mechanical properties hardly restricts the cooling rate and it may be determined mainly by the circumstances of the installation and its operation since the special treatment of rapid cooling-overaging is not required.
  • a preliminary heating zone may be arranged before the heating zone, or the heating zone may be divided into plural furnace bodies, which do not injure the effect of the invention. Further, the feature that the cooling zone is divided into two or more cooling furnace bodies for enhancing the cooling efficiency also does not injure the effect of the invention.
  • the invention when using an extra-low carbon steel as a sheet material, various mechanical properties can be obtained from the same sheet material or the mechanical properties of a non-steady portion in the sheet material can be made uniform by accurately controlling only the heat annealing temperature in the continuous annealing treatment.
  • the invention can advantageously realize the following facts:
  • the heating capacity of the heating zone was about 40x106 kcal/hr.
  • the soaking zone only had a heating capacity compensating for the dissipation of heat from the furnace body and its burner capacity was a tenth of that of the heating zone.
  • the heating capacity of the temperature regulating zone according to the present invention is at least twice that of a conventional soaking zone by using a super-high temperature radiant tube having a furnace temperature above 1100°C together with a high temperature gas jet, which corresponds to 10 ⁇ 20x106 kcal/hr.
  • the heating capacity of the temperature regulating zone is more than that of the heating zone.
  • the intended heating temperature of the deep drawable extra-low carbon steel can be accurately controlled to obtain a steel sheet having no variation in mechanical properties. Further, the heat efficiency can be enhanced by arranging the preliminary heating zone before the heating zone.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Claims (2)

  1. Procédé pour recuire en continu un matériau en feuille d'acier en teneur extra-basse en carbone pour emboutissage profond, comprenant les étapes qui consistent à chauffer et refroidir le matériau en feuille, caractérisé en ce que le matériau en feuille est porté de la température ambiante à une température supérieure à sa température de recristallisation, en ce que la température de la feuille chauffée est régulée par chauffage rapide à une température maximale désirée, ladite température maximale étant déterminée par la composition de l'acier, avec une précision de ± 10 °C, en ce qu'elle est ensuite rapidement refroidie sans maintien en température après avoir atteint ladite température maximale et en ce que le matériau en feuille rapidement refroidi est enfin refroidi à température ambiante.
  2. Procédé selon la revendication 1, caractérisé en ce que ledit acier est partiellement refroidi lors de la phase de chauffage pour réguler la température maximale désirée.
EP86306234A 1985-08-13 1986-08-12 Procédé pour recuire en continu un acier en teneur extra-basse en carbone pour emboutissage profond Expired - Lifetime EP0211681B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86306234T ATE103011T1 (de) 1985-08-13 1986-08-12 Verfahren zur kontinuierlichen waermebehandlung von tiefziehfaehigen staehlen mit sehr niedrigem kohlenstoffgehalt.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP176817/85 1985-08-13
JP17681785 1985-08-13

Publications (3)

Publication Number Publication Date
EP0211681A2 EP0211681A2 (fr) 1987-02-25
EP0211681A3 EP0211681A3 (en) 1990-06-06
EP0211681B1 true EP0211681B1 (fr) 1994-03-16

Family

ID=16020362

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86306234A Expired - Lifetime EP0211681B1 (fr) 1985-08-13 1986-08-12 Procédé pour recuire en continu un acier en teneur extra-basse en carbone pour emboutissage profond

Country Status (11)

Country Link
EP (1) EP0211681B1 (fr)
JP (1) JPS62124233A (fr)
KR (1) KR910001607B1 (fr)
CN (1) CN1012826B (fr)
AT (1) ATE103011T1 (fr)
BE (1) BE905254A (fr)
CA (1) CA1274157A (fr)
DE (1) DE3689714T2 (fr)
ES (1) ES2000607A6 (fr)
FR (1) FR2586257B1 (fr)
IT (1) IT1197864B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19860472A1 (de) * 1998-12-28 2000-07-06 Bosch Gmbh Robert Verfahren zum Vergüten von Stahlbändern
CN101921949B (zh) * 2010-07-22 2012-01-25 首钢总公司 一种冷轧薄板45号钢连续退火生产方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3385946A (en) * 1965-04-16 1968-05-28 Westinghouse Electric Corp Continuous annealing method and apparatus
FR2087775A5 (fr) * 1969-11-14 1971-12-31 Nippon Kokan Kk
JPS6044376B2 (ja) * 1978-10-21 1985-10-03 新日本製鐵株式会社 非時効性で、かつ深絞り加工性の優れた連続熱処理による冷延鋼板の製造方法
JPS5989727A (ja) * 1982-11-12 1984-05-24 Kawasaki Steel Corp プレス成形性の優れた超深絞り用冷延鋼板の製造方法
JPS60106919A (ja) * 1983-11-15 1985-06-12 Kawasaki Steel Corp 極低炭素冷延鋼板の連続焼鈍方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
The Making, Shaping and Treating of Steel, 9th Edition, USS, 1971, page 977 *

Also Published As

Publication number Publication date
KR910001607B1 (ko) 1991-03-16
FR2586257B1 (fr) 1991-03-01
IT8621475A0 (it) 1986-08-12
JPH0538046B2 (fr) 1993-06-07
ATE103011T1 (de) 1994-04-15
DE3689714D1 (de) 1994-04-21
JPS62124233A (ja) 1987-06-05
FR2586257A1 (fr) 1987-02-20
CA1274157A (fr) 1990-09-18
EP0211681A2 (fr) 1987-02-25
KR870002288A (ko) 1987-03-30
BE905254A (fr) 1986-12-01
DE3689714T2 (de) 1994-09-29
IT8621475A1 (it) 1988-02-12
ES2000607A6 (es) 1988-03-01
IT1197864B (it) 1988-12-21
EP0211681A3 (en) 1990-06-06
CN86105994A (zh) 1987-04-01
CN1012826B (zh) 1991-06-12

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