JPS56146826A - Production of high tensile steel sheet having low yield ratio and high ductility - Google Patents

Production of high tensile steel sheet having low yield ratio and high ductility

Info

Publication number
JPS56146826A
JPS56146826A JP4867680A JP4867680A JPS56146826A JP S56146826 A JPS56146826 A JP S56146826A JP 4867680 A JP4867680 A JP 4867680A JP 4867680 A JP4867680 A JP 4867680A JP S56146826 A JPS56146826 A JP S56146826A
Authority
JP
Japan
Prior art keywords
steel sheet
low yield
yield ratio
tensile steel
high tensile
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
JP4867680A
Other languages
Japanese (ja)
Other versions
JPS618126B2 (en
Inventor
Takayoshi Shimomura
Koichi Osawa
Takeshi Okuyama
Masayuki Kinoshita
Michinori Kajita
Masaharu Jitsukawa
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 Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan 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 NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP4867680A priority Critical patent/JPS56146826A/en
Publication of JPS56146826A publication Critical patent/JPS56146826A/en
Publication of JPS618126B2 publication Critical patent/JPS618126B2/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
    • 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

Abstract

PURPOSE:To produce a high tensile steel sheet having a low yield ratio, high ductility and high curing performance for baking and useful for automotive bodies etc. by passing a steel limited of solid solution C and S, P content in particular to a rolling-annealing line under specific conditions. CONSTITUTION:The steel consisting of 0.03-0.15% C, 0.01-0.80% Si, 1.00- 2.10% Mn, where C+1/5Mn=0.35-0.45%, <=0.015% P, 0.010-0.100% Sol Al, and metal/S=4-15 of >=1 kinds of Zr, REM, Ti where >=0.003% S, and the balance iron with unavoidable impurities is produced. This is finish-rolled at above the Ar3 transformation point in a hot rolling process and is coiled at below the Ar1 point, thereafter it is pickled. Then, it is heated at 730-900 deg.C, and is held for 10-300sec, thereafter it is cooled down to 600-300 deg.C at 5-30 deg.C/sec cooling rates, thence it is water-hardened. By this method, the high tensile steel sheet having a low yield ratio and high ductility is obtained inexpensively.
JP4867680A 1980-04-15 1980-04-15 Production of high tensile steel sheet having low yield ratio and high ductility Granted JPS56146826A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4867680A JPS56146826A (en) 1980-04-15 1980-04-15 Production of high tensile steel sheet having low yield ratio and high ductility

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4867680A JPS56146826A (en) 1980-04-15 1980-04-15 Production of high tensile steel sheet having low yield ratio and high ductility

Publications (2)

Publication Number Publication Date
JPS56146826A true JPS56146826A (en) 1981-11-14
JPS618126B2 JPS618126B2 (en) 1986-03-12

Family

ID=12809915

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4867680A Granted JPS56146826A (en) 1980-04-15 1980-04-15 Production of high tensile steel sheet having low yield ratio and high ductility

Country Status (1)

Country Link
JP (1) JPS56146826A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61264159A (en) * 1985-05-13 1986-11-22 Kobe Steel Ltd High-strength hot-rolled steel sheet of 55kgf/mm2 level for direct current butt welding
JPS61264160A (en) * 1985-05-13 1986-11-22 Kobe Steel Ltd High-strength hot-rolled steel sheet of 60kgf/mm2 level for direct current butt welding
JPH02282420A (en) * 1989-04-21 1990-11-20 Sumitomo Metal Ind Ltd Production of hot-rolled steel sheet to be worked and thermomechanical treatment of hot-rolled steel sheet
US8828153B2 (en) 2005-07-04 2014-09-09 Nippon Steel & Sumitomo Metal Corporation High-strength cold-rolled steel sheet and high-strength plated steel sheet

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6659366B2 (en) * 2016-01-15 2020-03-04 中央精機株式会社 Metal melting equipment

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61264159A (en) * 1985-05-13 1986-11-22 Kobe Steel Ltd High-strength hot-rolled steel sheet of 55kgf/mm2 level for direct current butt welding
JPS61264160A (en) * 1985-05-13 1986-11-22 Kobe Steel Ltd High-strength hot-rolled steel sheet of 60kgf/mm2 level for direct current butt welding
JPH0581658B2 (en) * 1985-05-13 1993-11-15 Kobe Steel Ltd
JPH02282420A (en) * 1989-04-21 1990-11-20 Sumitomo Metal Ind Ltd Production of hot-rolled steel sheet to be worked and thermomechanical treatment of hot-rolled steel sheet
US8828153B2 (en) 2005-07-04 2014-09-09 Nippon Steel & Sumitomo Metal Corporation High-strength cold-rolled steel sheet and high-strength plated steel sheet

Also Published As

Publication number Publication date
JPS618126B2 (en) 1986-03-12

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