JPS57194209A - Production of hot rolled high tensile steel plate or high forming property - Google Patents

Production of hot rolled high tensile steel plate or high forming property

Info

Publication number
JPS57194209A
JPS57194209A JP7903281A JP7903281A JPS57194209A JP S57194209 A JPS57194209 A JP S57194209A JP 7903281 A JP7903281 A JP 7903281A JP 7903281 A JP7903281 A JP 7903281A JP S57194209 A JPS57194209 A JP S57194209A
Authority
JP
Japan
Prior art keywords
steel plate
tensile steel
high tensile
temp
forming property
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
JP7903281A
Other languages
Japanese (ja)
Other versions
JPS6339647B2 (en
Inventor
Kazuhide Nakaoka
Yoshihiro Hosoya
Tomoyoshi Okita
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 JP7903281A priority Critical patent/JPS57194209A/en
Publication of JPS57194209A publication Critical patent/JPS57194209A/en
Publication of JPS6339647B2 publication Critical patent/JPS6339647B2/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

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 Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

PURPOSE:To obtain a high tensile steel plate of low yield ratios having excellent balance of strength and ductility by desirable combinations of controlling the austenite grain sizes in the stage of hot rolling adequately and controlling cooling conditions after the end of finish rolling. CONSTITUTION:The steel contg. 0.05-0.15% C, 0.4-1.5% Si, 1.0-2.5% Mn, <=0.005% S, and, if necessary, >=1 kind of <=0.5% Cr, and <=0.3% Mo is prepared as a blank material. In the stage of hot rolling of this steel, it is screwed down to >=40% total drafts in a temp. region of <=35mum austenite grain aizes at <= 880 deg.C and is finished at >=Ar3 point. The steel plate after the finishing is cooled quickly to the Ar3 point - (Ar3-100) deg.C within 2 seconds and is held at around these temp. for 1sec, after which it is cooled quickly down to >=40 deg.C/S cooling rates. The coiling temp. of this time is kept at <=250 deg.C. As a result, the hot rolled high tensile steel plate of high forming property is obtained stably and accurately.
JP7903281A 1981-05-25 1981-05-25 Production of hot rolled high tensile steel plate or high forming property Granted JPS57194209A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7903281A JPS57194209A (en) 1981-05-25 1981-05-25 Production of hot rolled high tensile steel plate or high forming property

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7903281A JPS57194209A (en) 1981-05-25 1981-05-25 Production of hot rolled high tensile steel plate or high forming property

Publications (2)

Publication Number Publication Date
JPS57194209A true JPS57194209A (en) 1982-11-29
JPS6339647B2 JPS6339647B2 (en) 1988-08-05

Family

ID=13678582

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7903281A Granted JPS57194209A (en) 1981-05-25 1981-05-25 Production of hot rolled high tensile steel plate or high forming property

Country Status (1)

Country Link
JP (1) JPS57194209A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008001984A (en) * 2006-05-24 2008-01-10 Kobe Steel Ltd High-strength hot-rolled steel sheet excellent in formability for stretch flangeability, and manufacturing method therefor
CN109881107A (en) * 2019-04-01 2019-06-14 山东钢铁集团日照有限公司 A kind of hot rolling Q&P980 steel and its production method with different yield tensile ratios

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5591934A (en) * 1978-12-30 1980-07-11 Nippon Steel Corp Preparation of composite structure high tension hot rolled steel sheet having high ductility and low yield ratio characteristic
JPS5633427A (en) * 1979-08-28 1981-04-03 Sumitomo Metal Ind Ltd Manufacture of hot rolled high tensile steel sheet
JPS5633428A (en) * 1979-08-28 1981-04-03 Sumitomo Metal Ind Ltd Manufacture of hot rolled high tensile steel sheet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5591934A (en) * 1978-12-30 1980-07-11 Nippon Steel Corp Preparation of composite structure high tension hot rolled steel sheet having high ductility and low yield ratio characteristic
JPS5633427A (en) * 1979-08-28 1981-04-03 Sumitomo Metal Ind Ltd Manufacture of hot rolled high tensile steel sheet
JPS5633428A (en) * 1979-08-28 1981-04-03 Sumitomo Metal Ind Ltd Manufacture of hot rolled high tensile steel sheet

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008001984A (en) * 2006-05-24 2008-01-10 Kobe Steel Ltd High-strength hot-rolled steel sheet excellent in formability for stretch flangeability, and manufacturing method therefor
CN109881107A (en) * 2019-04-01 2019-06-14 山东钢铁集团日照有限公司 A kind of hot rolling Q&P980 steel and its production method with different yield tensile ratios

Also Published As

Publication number Publication date
JPS6339647B2 (en) 1988-08-05

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