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EP0211681A2 - Verfahren zur kontinuierlichen Wärmebehandlung von tiefziehfähigen Stählen mit sehr niedrigem Kohlenstoffgehalt - Google Patents

Verfahren zur kontinuierlichen Wärmebehandlung von tiefziehfähigen Stählen mit sehr niedrigem Kohlenstoffgehalt Download PDF

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Publication number
EP0211681A2
EP0211681A2 EP86306234A EP86306234A EP0211681A2 EP 0211681 A2 EP0211681 A2 EP 0211681A2 EP 86306234 A EP86306234 A EP 86306234A EP 86306234 A EP86306234 A EP 86306234A EP 0211681 A2 EP0211681 A2 EP 0211681A2
Authority
EP
European Patent Office
Prior art keywords
zone
temperature
heating
low carbon
regulating
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
EP86306234A
Other languages
English (en)
French (fr)
Other versions
EP0211681B1 (de
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/de
Publication of EP0211681A3 publication Critical patent/EP0211681A3/en
Application granted granted Critical
Publication of EP0211681B1 publication Critical patent/EP0211681B1/de
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 and an apparatus for continuously annealing an extra-low carbon steel for deep drawing. More particularly, it relates to a method and an apparatus which can utilize excellent mechanical properties of extra-low carbon steel at maximum by taking a serious view of heating as a furnace structure as compared with the conventional furnace structure in which the most important section is cooling zone.
  • the cooling portion in all the existing continuous annealing equipments for the production of deep drawable steel sheets is a rate-determining portion of the equipment, and the operation and control processes thereof are planned so as to preferentially attain the desired cooling conditions. This is a natural consequence from a viewpoint of the conventional technical idea.
  • a temperature starting the rapid cooling or a temperature at an outlet side of a soaking zone should be constant.
  • the temperature in the heating zone varies as shown by symbols (i), (ii) and (iii) in Fig. 4a, and in extreme cases, the sheet heated to a higher temperature in the heating zone is gradually cooled in the soaking zone as shown in the symbol (i) of Fig. 4a.
  • r-value (Lankford value) was measured to obtain a result as shown in Fig. 3.
  • Fig. 3 in case of the low carbon steel, the r-value tends to increase as the annealing temperature rises, but the change of r-value is not so large. Inversely, when the annealing temperature reaches 850°C, the rate of austenite phase increases to obstruct the growth of crystal grains and hence the r-value tends to decrease. On the contrary, in case of the extra-low carbon steel, the r-value tends to considerably increase as the annealing temperature rises.
  • the steel sheet is annealed according to the changed heat cycle as shown in the symbols (i), (ii) and (iii) of Fig. 4a in the heating zone as previously mentioned, so that even when the temperature at delivery side of the soaking zone is constant, there is caused a problem of changing the mechanical properties by the maximum heating temperature in the heating zone.
  • a continuous annealing apparatus for deep drawable extra-low carbon steel comprising a heating zone, a temperature regulating zone having a heating capability per unit length of steel sheet larger than that of the heating zone and a good response capable of attaining a temperature accuracy of at least ⁇ 10°C even at a non-steady portion, a rapid cooling zone and a final cooling zone.
  • This apparatus is different from the conventional continuous annealing apparatus in a point that the temperature regulating zone is used instead of the soaking zone and the overaging zone is omitted as shown in Fig. lb.
  • a preliminary heating zone is arranged before the heating zone for improving heat efficiency.
  • a zone capable of cooling during the heating may be arranged in order to efficiently control the maximum heating temperature.
  • the apparatus according to the invention is largely different from the conventional apparatus shown in Fig. 4 in a point that the overaging zone is omitted and the temperature regulating zone is arranged 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 it 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, and also the temperature accuracy is necessary to be at least ⁇ 10°C even at a non-steady portion.
  • a means for directly blowing a high-temperature heated 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 a function of correcting the control of mechanical properties and change of components by the annealing temperature or a function of correcting the temperature of the steel sheet by the sheet travelling speed or change of sheet gauge, whereby the objective ultimate temperature of steel sheet can be controlled with a 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 objective ultimate temperature in the temperature regulating zone as shown in symbols (i), (ii), (iii) or (iv) of Fig. la, 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.
  • the cooling rate is hardly restricted from a viewpoint of mechanical properties, so that it may be determined mainly by circumstances from viewpoints of installation and operation because special treatment of rapid cooling-overaging is not required.
  • the reason why the steel sheet is rapidly cooled after the temperature reaches the objective ultimate temperature is due to the fact that the improvement of mechanical properties is no longer expected when the soaking time becomes long as shown in Fig. 2 and conversely risks such as abnormal growth of crystal grains, degradation of properties increase and frequency in occurrence of operational troubles such as heat buckle, pick-up and so on becomes high.
  • a preliminary heating zone may be arranged before the heating zone or the heating zone may be divided into plural furnace bodies, which does 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 does not also 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 non-steady portion in the sheet material can be uniformized by accurately controlling only the heat annealing temperature in the continuous annealing treatment.
  • the invention can advantageously realize the following facts:
  • the r-value, hot coiling temperature and heating temperature can uniformly be maintained over substantially the whole length of the sheet.
  • the heating capacity of the heating zone was about 40xlo 6 kcal/hr.
  • the soaking zone had only a heating capacity compensating dissipation 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 invention is at least two times of that of the 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 blowing, which corresponds to 10 ⁇ 20X10 6 kcal/hr.
  • the heating capacity of the temperature regulating zone is more than that of the heating zone.
  • the objective heating temperature of the deep drawable extra-low carbon steel can be accurately controlled to obtain a steel sheet having no change of mechanical properties. Further, the heat efficiency can be enhanced by arranging the preliminary heating zone before the heating zone. These improving effects are very conspicuous.

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  • 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)
EP86306234A 1985-08-13 1986-08-12 Verfahren zur kontinuierlichen Wärmebehandlung von tiefziehfähigen Stählen mit sehr niedrigem Kohlenstoffgehalt Expired - Lifetime EP0211681B1 (de)

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
JP17681785 1985-08-13
JP176817/85 1985-08-13

Publications (3)

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

Family

ID=16020362

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86306234A Expired - Lifetime EP0211681B1 (de) 1985-08-13 1986-08-12 Verfahren zur kontinuierlichen Wärmebehandlung von tiefziehfähigen Stählen mit sehr niedrigem Kohlenstoffgehalt

Country Status (11)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000039349A1 (de) * 1998-12-28 2000-07-06 Robert Bosch Gmbh Verfahren zum vergüten von stahlbändern

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (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
DE2056313B2 (de) * 1969-11-14 1972-11-09 Nippon Kokan K.K., Tokio Kontinuierliches Anlaßverfahren für kaltgewalztes, tiefziehfähiges Band
DE2942338A1 (de) * 1978-10-21 1980-04-24 Nippon Steel Corp Verfahren zur herstellung von alterungsbestaendigem kaltgewalztem stahlband
JPS5794524A (en) * 1980-12-04 1982-06-12 Nippon Kokan Kk <Nkk> Method for continuous annealing
EP0112027A1 (de) * 1982-11-12 1984-06-27 Kawasaki Steel Corporation Verfahren zur Herstellung von kaltgewalzten Stahlblechtafeln für extremes Tiefziehen mit hoher Formbarkeit beim Pressen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (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
DE2056313B2 (de) * 1969-11-14 1972-11-09 Nippon Kokan K.K., Tokio Kontinuierliches Anlaßverfahren für kaltgewalztes, tiefziehfähiges Band
DE2942338A1 (de) * 1978-10-21 1980-04-24 Nippon Steel Corp Verfahren zur herstellung von alterungsbestaendigem kaltgewalztem stahlband
JPS5794524A (en) * 1980-12-04 1982-06-12 Nippon Kokan Kk <Nkk> Method for continuous annealing
EP0112027A1 (de) * 1982-11-12 1984-06-27 Kawasaki Steel Corporation Verfahren zur Herstellung von kaltgewalzten Stahlblechtafeln für extremes Tiefziehen mit hoher Formbarkeit beim Pressen

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol.6, no.180 (C-125)(1058), 14 September 1982 & JP-A-57 094524 (NIPPON KOKAN) 12-06-1982 *
The Making, Shaping and Treating of Steel, 9th Edition, USS, 1971, page 977 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000039349A1 (de) * 1998-12-28 2000-07-06 Robert Bosch Gmbh Verfahren zum vergüten von stahlbändern

Also Published As

Publication number Publication date
BE905254A (fr) 1986-12-01
JPS62124233A (ja) 1987-06-05
IT8621475A0 (it) 1986-08-12
ES2000607A6 (es) 1988-03-01
EP0211681B1 (de) 1994-03-16
EP0211681A3 (en) 1990-06-06
CA1274157A (en) 1990-09-18
IT1197864B (it) 1988-12-21
KR870002288A (ko) 1987-03-30
IT8621475A1 (it) 1988-02-12
CN86105994A (zh) 1987-04-01
FR2586257A1 (fr) 1987-02-20
DE3689714D1 (de) 1994-04-21
KR910001607B1 (ko) 1991-03-16
ATE103011T1 (de) 1994-04-15
FR2586257B1 (fr) 1991-03-01
CN1012826B (zh) 1991-06-12
DE3689714T2 (de) 1994-09-29
JPH0538046B2 (de) 1993-06-07

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