JPS56105422A - Preparation of composite texture type high tensile hot rolled steel plate with excellent surface property - Google Patents

Preparation of composite texture type high tensile hot rolled steel plate with excellent surface property

Info

Publication number
JPS56105422A
JPS56105422A JP713880A JP713880A JPS56105422A JP S56105422 A JPS56105422 A JP S56105422A JP 713880 A JP713880 A JP 713880A JP 713880 A JP713880 A JP 713880A JP S56105422 A JPS56105422 A JP S56105422A
Authority
JP
Japan
Prior art keywords
steel
temp
steel plate
sec
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.)
Pending
Application number
JP713880A
Other languages
Japanese (ja)
Inventor
Shigeki Hamamatsu
Seiichi Sugisawa
Noriaki Nagao
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.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries 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 Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP713880A priority Critical patent/JPS56105422A/en
Publication of JPS56105422A publication Critical patent/JPS56105422A/en
Pending 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 prepare the titled steel plate with excellent weldability and a strength- ductility balance at a low cost by reducing a Si content of a steel as well as controlling cooling after hot rolling. CONSTITUTION:The steel consisting of, in the percent weight basis, 0.03-0.20% of C; <=0.15% Si; 0.3-3.0% Mn; <=0.10% sol. Al and the remainder of Fe and inevitable impurities is subjected to the hot rolling and a final finishing temp. is adjusted to an Ar3 point or more. Immediately, said steel is rapidly quenched to a temp. range of Ar3-Ar1 point at a cooling speed of 20-75 deg.C/sec and, subsequently, gradually cooled over a time of 2sec or more at a cooling speed of 20 deg.C/sec or less within said temp. range. Then, said steel is rapidly quenched again to an Ms point or below at a cooling speed of 20-75 deg.C/sec. If said steel is treated as described above, the high tensile hot rolled steel plate having no stripe like scale scars generated on a surface thereof and a composite texture of a low temp. transformation product comprising either a martensite phase and a bainite phase or both of them and a ferrite phase as well as excellent strength-ductility balance and weldability can be obtained.
JP713880A 1980-01-24 1980-01-24 Preparation of composite texture type high tensile hot rolled steel plate with excellent surface property Pending JPS56105422A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP713880A JPS56105422A (en) 1980-01-24 1980-01-24 Preparation of composite texture type high tensile hot rolled steel plate with excellent surface property

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP713880A JPS56105422A (en) 1980-01-24 1980-01-24 Preparation of composite texture type high tensile hot rolled steel plate with excellent surface property

Publications (1)

Publication Number Publication Date
JPS56105422A true JPS56105422A (en) 1981-08-21

Family

ID=11657710

Family Applications (1)

Application Number Title Priority Date Filing Date
JP713880A Pending JPS56105422A (en) 1980-01-24 1980-01-24 Preparation of composite texture type high tensile hot rolled steel plate with excellent surface property

Country Status (1)

Country Link
JP (1) JPS56105422A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1982002902A1 (en) * 1981-02-20 1982-09-02 Morita Masahiko Process for manufacturing high-tensile,hot-rolled steel strip having a low yield ratio due to its mixed 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
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
JPS62202048A (en) * 1985-11-26 1987-09-05 Kobe Steel Ltd High strength hot rolled steel plate and its manufacture

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1982002902A1 (en) * 1981-02-20 1982-09-02 Morita Masahiko Process for manufacturing high-tensile,hot-rolled steel strip having a low yield ratio due to its mixed 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
JPH048485B2 (en) * 1984-01-20 1992-02-17
JPH0525941B2 (en) * 1984-01-20 1993-04-14 Kobe Steel Ltd
JPS6156264A (en) * 1984-08-24 1986-03-20 Kobe Steel Ltd High strength and high ductility ultrathin steel wire
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
JPS62202048A (en) * 1985-11-26 1987-09-05 Kobe Steel Ltd High strength hot rolled steel plate and its manufacture
JPH0524221B2 (en) * 1985-11-26 1993-04-07 Kobe Steel Ltd

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