JPS5534659A - Manufacture of high tensile steel sheet with superior cold workability - Google Patents

Manufacture of high tensile steel sheet with superior cold workability

Info

Publication number
JPS5534659A
JPS5534659A JP10713978A JP10713978A JPS5534659A JP S5534659 A JPS5534659 A JP S5534659A JP 10713978 A JP10713978 A JP 10713978A JP 10713978 A JP10713978 A JP 10713978A JP S5534659 A JPS5534659 A JP S5534659A
Authority
JP
Japan
Prior art keywords
steel sheet
temp
sec
cooling rate
sheet
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
JP10713978A
Other languages
Japanese (ja)
Other versions
JPS5818970B2 (en
Inventor
Yoshio Sakamoto
Isao Ito
Shoichi Takizawa
Takao Ikenaga
Nobuo Aoyanagi
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 JP10713978A priority Critical patent/JPS5818970B2/en
Publication of JPS5534659A publication Critical patent/JPS5534659A/en
Publication of JPS5818970B2 publication Critical patent/JPS5818970B2/en
Expired 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)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

PURPOSE:To obtain the title sheet with low yield ratio by treating a steel sheet consisting of a specified amt. of C, Mn, Si, and the balance Fe and inevitable impurities while specifying the temp. in hot rolling and the cooling rate and by coiling the treated sheet. CONSTITUTION:A steel sheet consisting of C 0.05-0.25%, Mn 0.1-2%, Si <=1%, and the balance Fe and inevitable impurities is treated under the following conditions and coiled: at the time of hot rolling the temp. is regulated to below the equilibrium ferrite transformation start temp. (T1), and a reduction ratio of 20- 80% is applied. The hot rolled sheet is then cooled from T1 to the ferrite transformation start temp. (T2) at an average cooling rate above 30 deg.C/sec and from T2 to above the pearlite transformation start temp. at an average cooling rate below 30 deg.C/sec for above 2 sec. The cooled sheet is further cooled at a cooling rate above 50 deg.C/sec and coiled at below the bainite transformation start temp. Thus, a high tensile steel sheet is obtd. having a mixed structure of bainite phase and/or martensite phase and ferrite phase and an yield ratio below 80%.
JP10713978A 1978-08-31 1978-08-31 Method for manufacturing high-strength thin steel sheets with excellent cold workability Expired JPS5818970B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10713978A JPS5818970B2 (en) 1978-08-31 1978-08-31 Method for manufacturing high-strength thin steel sheets with excellent cold workability

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10713978A JPS5818970B2 (en) 1978-08-31 1978-08-31 Method for manufacturing high-strength thin steel sheets with excellent cold workability

Publications (2)

Publication Number Publication Date
JPS5534659A true JPS5534659A (en) 1980-03-11
JPS5818970B2 JPS5818970B2 (en) 1983-04-15

Family

ID=14451491

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10713978A Expired JPS5818970B2 (en) 1978-08-31 1978-08-31 Method for manufacturing high-strength thin steel sheets with excellent cold workability

Country Status (1)

Country Link
JP (1) JPS5818970B2 (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5735663A (en) * 1980-08-11 1982-02-26 Kobe Steel Ltd Hot rolled steel plate for rim of wheel
US4406713A (en) * 1981-03-20 1983-09-27 Kabushiki Kaisha Kobe Seiko Sho Method of making high-strength, high-toughness steel with good workability
US4472208A (en) * 1982-06-28 1984-09-18 Sumitomo Metal Industries, Ltd. Hot-rolled high tensile titanium steel plates and production thereof
US4501626A (en) * 1980-10-17 1985-02-26 Kabushiki Kaisha Kobe Seiko Sho High strength steel plate and method for manufacturing same
US4502897A (en) * 1981-02-20 1985-03-05 Kawasaki Steel Corporation Method for producing hot-rolled steel sheets having a low yield ratio and a high tensile strength due to dual phase structure
JPS60152655A (en) * 1984-01-20 1985-08-10 Kobe Steel Ltd High-strength low-carbon steel material having superior heavy workability
JPS60152654A (en) * 1984-01-20 1985-08-10 Kobe Steel Ltd Steel material having superior resistance to hydrogen induced cracking, high strength, ductility and toughness and its manufacture
JPS6156264A (en) * 1984-08-24 1986-03-20 Kobe Steel Ltd High strength and high ductility ultrathin steel wire
JPS6196057A (en) * 1985-06-01 1986-05-14 Kobe Steel Ltd Hot-rolled steel plate having maximum strength
JPS61130454A (en) * 1984-11-28 1986-06-18 Kobe Steel Ltd High-strength hot-rolled steel sheet having superior suitability to stretch flanging and ferrite-bainite structure and its manufacture
JPS61170518A (en) * 1985-01-25 1986-08-01 Kobe Steel Ltd Production of high-strength hot rolled steel sheet having excellent formability
JPS6250436A (en) * 1985-08-29 1987-03-05 Kobe Steel Ltd Low carbon steel wire superior in cold wire drawability
US5213634A (en) * 1991-04-08 1993-05-25 Deardo Anthony J Multiphase microalloyed steel and method thereof
CN108431282A (en) * 2015-12-28 2018-08-21 Posco公司 Tool steel plate and its manufacturing method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19833321A1 (en) * 1998-07-24 2000-01-27 Schloemann Siemag Ag Method and installation to produce dual phase steels out of hot-rolled strip, with cooling rate at first cooling stage set sufficiently low to obtain temperature which is sufficiently high for rapid transformation of austenite into ferrite

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02428B2 (en) * 1980-08-11 1990-01-08 Kobe Steel Ltd
JPS5735663A (en) * 1980-08-11 1982-02-26 Kobe Steel Ltd Hot rolled steel plate for rim of wheel
US4501626A (en) * 1980-10-17 1985-02-26 Kabushiki Kaisha Kobe Seiko Sho High strength steel plate and method for manufacturing same
US4502897A (en) * 1981-02-20 1985-03-05 Kawasaki Steel Corporation Method for producing hot-rolled steel sheets having a low yield ratio and a high tensile strength due to dual phase structure
US4406713A (en) * 1981-03-20 1983-09-27 Kabushiki Kaisha Kobe Seiko Sho Method of making high-strength, high-toughness steel with good workability
US4472208A (en) * 1982-06-28 1984-09-18 Sumitomo Metal Industries, Ltd. Hot-rolled high tensile titanium steel plates and production thereof
JPS60152655A (en) * 1984-01-20 1985-08-10 Kobe Steel Ltd High-strength low-carbon steel material having superior heavy workability
JPS60152654A (en) * 1984-01-20 1985-08-10 Kobe Steel Ltd Steel material having superior resistance to hydrogen induced cracking, high strength, ductility and toughness and its manufacture
JPH0525941B2 (en) * 1984-01-20 1993-04-14 Kobe Steel Ltd
JPH048485B2 (en) * 1984-01-20 1992-02-17
JPS6156264A (en) * 1984-08-24 1986-03-20 Kobe Steel Ltd High strength and high ductility ultrathin steel wire
JPH045743B2 (en) * 1984-11-28 1992-02-03 Kobe Steel Ltd
JPS61130454A (en) * 1984-11-28 1986-06-18 Kobe Steel Ltd High-strength hot-rolled steel sheet having superior suitability to stretch flanging and ferrite-bainite structure and its manufacture
JPS61170518A (en) * 1985-01-25 1986-08-01 Kobe Steel Ltd Production of high-strength hot rolled steel sheet having excellent formability
JPS6196057A (en) * 1985-06-01 1986-05-14 Kobe Steel Ltd Hot-rolled steel plate having maximum strength
JPS6250436A (en) * 1985-08-29 1987-03-05 Kobe Steel Ltd Low carbon steel wire superior in cold wire drawability
US5213634A (en) * 1991-04-08 1993-05-25 Deardo Anthony J Multiphase microalloyed steel and method thereof
CN108431282A (en) * 2015-12-28 2018-08-21 Posco公司 Tool steel plate and its manufacturing method
US11214845B2 (en) 2015-12-28 2022-01-04 Posco Steel sheet for tool and manufacturing method therefor

Also Published As

Publication number Publication date
JPS5818970B2 (en) 1983-04-15

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