JPS57131325A - Production of low yield ratio, high tensile cold rolled steel plate having good gamma value - Google Patents

Production of low yield ratio, high tensile cold rolled steel plate having good gamma value

Info

Publication number
JPS57131325A
JPS57131325A JP1515981A JP1515981A JPS57131325A JP S57131325 A JPS57131325 A JP S57131325A JP 1515981 A JP1515981 A JP 1515981A JP 1515981 A JP1515981 A JP 1515981A JP S57131325 A JPS57131325 A JP S57131325A
Authority
JP
Japan
Prior art keywords
steel plate
transformation point
cold rolled
production
temp
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
JP1515981A
Other languages
Japanese (ja)
Other versions
JPH026814B2 (en
Inventor
Koichi Hashiguchi
Isao Takahashi
Toshio Irie
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 JP1515981A priority Critical patent/JPS57131325A/en
Publication of JPS57131325A publication Critical patent/JPS57131325A/en
Publication of JPH026814B2 publication Critical patent/JPH026814B2/ja
Granted 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
    • 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

Abstract

PURPOSE:To obtain a titled steel plate of superior workability by cold rolling the steel plate then subjecting the same to box annealing wherein it is hated to prescribed temps. and is then cooled down to the next prescribed temps. and is held at these temp. then subjecting the same to prescribed continuous annealing. CONSTITUTION:Steel contg., by weight, 0.02-0.12% C, 0.5-1.5% Mn, <=0.1% Al, and in some cases, further contg. Si, P, Cr, Mo, Nb, Ti, V, B, etc., and consisting of the balance Fe is cold rolled. Then, after cold rolling of said steel plate it is subjected to the box annealing of heating to an Ac1 transformation point (Ac1 transformation point +100 deg.C) temp. range for a short time, followed by cooling down to (Ac1 transformation point -100 deg.C) Ac1 transformation point temp. range and holding at these temps. for longer than the time (t) determined by the equationI. Thereafter, it is subjected to the continuous annealing of heating for >=1 second in an alpha-gamma region, and setting the average cooling rate down to 650-300 deg.C to the critical cooling rate (CR deg.C/s)-200 deg.C/s range determined by the equationI.
JP1515981A 1981-02-04 1981-02-04 Production of low yield ratio, high tensile cold rolled steel plate having good gamma value Granted JPS57131325A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1515981A JPS57131325A (en) 1981-02-04 1981-02-04 Production of low yield ratio, high tensile cold rolled steel plate having good gamma value

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1515981A JPS57131325A (en) 1981-02-04 1981-02-04 Production of low yield ratio, high tensile cold rolled steel plate having good gamma value

Publications (2)

Publication Number Publication Date
JPS57131325A true JPS57131325A (en) 1982-08-14
JPH026814B2 JPH026814B2 (en) 1990-02-14

Family

ID=11881016

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1515981A Granted JPS57131325A (en) 1981-02-04 1981-02-04 Production of low yield ratio, high tensile cold rolled steel plate having good gamma value

Country Status (1)

Country Link
JP (1) JPS57131325A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60245728A (en) * 1984-05-22 1985-12-05 Kawasaki Steel Corp Manufacture of high tension steel sheet having not less than 70% yield ratio and high ductility
US4770719A (en) * 1984-04-12 1988-09-13 Kawasaki Steel Corporation Method of manufacturing a low yield ratio high-strength steel sheet having good ductility and resistance to secondary cold-work embrittlement
US4830686A (en) * 1984-04-12 1989-05-16 Kawasaki Steel Corporation Low yield ratio high-strength annealed steel sheet having good ductility and resistance to secondary cold-work embrittlement

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05112845A (en) * 1991-03-30 1993-05-07 Nippon Steel Corp High strength cold rolled steel for deep drawing good in face shapeability after forming and having excellent dent resistance

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55158226A (en) * 1979-05-28 1980-12-09 Nippon Steel Corp Manufacture of cold rolled steel sheet having high tensile strength and composite structure excellent in deep drawability

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55158226A (en) * 1979-05-28 1980-12-09 Nippon Steel Corp Manufacture of cold rolled steel sheet having high tensile strength and composite structure excellent in deep drawability

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4770719A (en) * 1984-04-12 1988-09-13 Kawasaki Steel Corporation Method of manufacturing a low yield ratio high-strength steel sheet having good ductility and resistance to secondary cold-work embrittlement
US4830686A (en) * 1984-04-12 1989-05-16 Kawasaki Steel Corporation Low yield ratio high-strength annealed steel sheet having good ductility and resistance to secondary cold-work embrittlement
JPS60245728A (en) * 1984-05-22 1985-12-05 Kawasaki Steel Corp Manufacture of high tension steel sheet having not less than 70% yield ratio and high ductility
JPH0218363B2 (en) * 1984-05-22 1990-04-25 Kawasaki Steel Co

Also Published As

Publication number Publication date
JPH026814B2 (en) 1990-02-14

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