JPS55131130A - Production of high strength steel material having low yield ratio - Google Patents

Production of high strength steel material having low yield ratio

Info

Publication number
JPS55131130A
JPS55131130A JP3813179A JP3813179A JPS55131130A JP S55131130 A JPS55131130 A JP S55131130A JP 3813179 A JP3813179 A JP 3813179A JP 3813179 A JP3813179 A JP 3813179A JP S55131130 A JPS55131130 A JP S55131130A
Authority
JP
Japan
Prior art keywords
steel material
yield ratio
low
low yield
temperature
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
JP3813179A
Other languages
Japanese (ja)
Inventor
Masashi Takahashi
Kazutoshi Kunishige
Seiichi Sugisawa
Shoichi Tsunematsu
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 JP3813179A priority Critical patent/JPS55131130A/en
Publication of JPS55131130A publication Critical patent/JPS55131130A/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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/185—Hardening; Quenching with or without subsequent tempering from an intercritical temperature

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 Sheet Steel (AREA)

Abstract

PURPOSE:To produce the high-strength steel plate having a low yield ratio by applying the specific heat treatment of low carbon steel material to make its structure to ferrite and low temperature transformed structure. CONSTITUTION:The steel containing C; 0.01-0.15%, Si<3.0%, Mn; 1.0-4.0%, S<0.015%, sol.Al; 0.001-0.10%, or the steel further containing, if necessary, one or more kinds of Cu<1.0%, Ni<1.0%, Cr<1.0%, Mo<0.4%, Nb<0.10%, V<0.15%, Ti<0.15%, Zr<0.10%, rare earth elements <0.10%, Ca<0.01%. This steel material is heated to the temperature between the AC1 point and AC3 point, after which the co-existence temperature region of ferrite and austenite is slow cooled as far as possible at a cooling rate of 10 deg.C/sec. or less. Next, in order to cause low-temperature transformation of the austenite portion, it is quenched at a cooling rate of 30 deg.C/sec. or more. This yields the steel material for automobiles of tensile strength 50kg/mm<2> or more and a low yield ratio.
JP3813179A 1979-03-29 1979-03-29 Production of high strength steel material having low yield ratio Pending JPS55131130A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3813179A JPS55131130A (en) 1979-03-29 1979-03-29 Production of high strength steel material having low yield ratio

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3813179A JPS55131130A (en) 1979-03-29 1979-03-29 Production of high strength steel material having low yield ratio

Publications (1)

Publication Number Publication Date
JPS55131130A true JPS55131130A (en) 1980-10-11

Family

ID=12516880

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3813179A Pending JPS55131130A (en) 1979-03-29 1979-03-29 Production of high strength steel material having low yield ratio

Country Status (1)

Country Link
JP (1) JPS55131130A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01259120A (en) * 1988-04-11 1989-10-16 Nisshin Steel Co Ltd Manufacture of ultrahigh strength steel stock having superior ductility
JPH01259121A (en) * 1988-04-11 1989-10-16 Nisshin Steel Co Ltd Manufacture of ultrahigh strength steel stock excellent in ductility
JPH03140441A (en) * 1989-10-26 1991-06-14 Mannesmann Ag Steel pipe material for reinforcing automobile door
JPH0517825A (en) * 1991-05-27 1993-01-26 Sumitomo Metal Ind Ltd Production of cold rolled high strength steel sheet excellent in formability

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01259120A (en) * 1988-04-11 1989-10-16 Nisshin Steel Co Ltd Manufacture of ultrahigh strength steel stock having superior ductility
JPH01259121A (en) * 1988-04-11 1989-10-16 Nisshin Steel Co Ltd Manufacture of ultrahigh strength steel stock excellent in ductility
JPH03140441A (en) * 1989-10-26 1991-06-14 Mannesmann Ag Steel pipe material for reinforcing automobile door
JPH0517825A (en) * 1991-05-27 1993-01-26 Sumitomo Metal Ind Ltd Production of cold rolled high strength steel sheet excellent in formability

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