JPS57152422A - Production of high tensile steel plate of low crack sensitivity - Google Patents

Production of high tensile steel plate of low crack sensitivity

Info

Publication number
JPS57152422A
JPS57152422A JP3749081A JP3749081A JPS57152422A JP S57152422 A JPS57152422 A JP S57152422A JP 3749081 A JP3749081 A JP 3749081A JP 3749081 A JP3749081 A JP 3749081A JP S57152422 A JPS57152422 A JP S57152422A
Authority
JP
Japan
Prior art keywords
crack sensitivity
strength
hardened
steel plate
tensile steel
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
JP3749081A
Other languages
Japanese (ja)
Inventor
Shuichi Suzuki
Kiyoshi Bessho
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 JP3749081A priority Critical patent/JPS57152422A/en
Publication of JPS57152422A publication Critical patent/JPS57152422A/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)

Abstract

PURPOSE:To obtain a high-tensile steel plate of low crack sensitivity without addition of Mo, etc. that entails increase in sensitivity and cost by adding Nb, V, Ti, etc. and specifying rolling and heat treatment conditions. CONSTITUTION:Steel consisting, by weight %, of 0.03-0.10 C, 0.05-0.50 Si, 0.50-2.00 Mn, >=1 kind of 0.005-0.050 Ti, 0.010-0.050 Nb, and 0.03-0.10 V, and if necessary, 0.10-1.00 Ni and/or 0.0005-0.0030 B and the balance Fe and unavoidable impurities and <=0.20 PCM (weld crack sensitivity) of the equation is heated to 1,100-1,280 deg.C, and is rolled at >=30% draft at <=950 deg.C, immediately after which it is hardened or hardened and tempered. Namely, while the strength is improved by keeping C low and allowing carbides of Nb, V, Ti to deposit more than required, the degradation in toughness is prevented and the nonrecrystallizing region of austenite is widened by these elements. In this region, the steel is rolled and is directly hardened from the austenite having received sufficiently large working strains, whereby the strength is improved and the deficiency in the strength on account of the insufficiency in the carbides of Nb, Ti, V is compensated.
JP3749081A 1981-03-16 1981-03-16 Production of high tensile steel plate of low crack sensitivity Pending JPS57152422A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3749081A JPS57152422A (en) 1981-03-16 1981-03-16 Production of high tensile steel plate of low crack sensitivity

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3749081A JPS57152422A (en) 1981-03-16 1981-03-16 Production of high tensile steel plate of low crack sensitivity

Publications (1)

Publication Number Publication Date
JPS57152422A true JPS57152422A (en) 1982-09-20

Family

ID=12498955

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3749081A Pending JPS57152422A (en) 1981-03-16 1981-03-16 Production of high tensile steel plate of low crack sensitivity

Country Status (1)

Country Link
JP (1) JPS57152422A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2536765A1 (en) * 1982-11-29 1984-06-01 Nippon Kokan Kk PROCESS FOR MANUFACTURING STEEL PLATES HAVING HIGH TENSILE STRENGTH
JPS62158817A (en) * 1985-12-28 1987-07-14 Nippon Steel Corp Manufacture of thick steel plate having high strength and high toughness
JPH0196329A (en) * 1987-10-07 1989-04-14 Nippon Steel Corp Manufacture of steel for welding construction excellent in sulfide stress corrosion cracking resistance and having >=56kgf/mm2 tensile strength

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5468719A (en) * 1977-11-10 1979-06-02 Kawasaki Steel Co Production of nonthermal refining high tensile steel plate with excellent low temperature flexibility
JPS54118325A (en) * 1978-03-08 1979-09-13 Nippon Kokan Kk <Nkk> Production of hydrogen crack resistant nonrefined steel plate
JPS55115924A (en) * 1979-03-02 1980-09-06 Nippon Kokan Kk <Nkk> Production of high toughness high tensile steel plate

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5468719A (en) * 1977-11-10 1979-06-02 Kawasaki Steel Co Production of nonthermal refining high tensile steel plate with excellent low temperature flexibility
JPS54118325A (en) * 1978-03-08 1979-09-13 Nippon Kokan Kk <Nkk> Production of hydrogen crack resistant nonrefined steel plate
JPS55115924A (en) * 1979-03-02 1980-09-06 Nippon Kokan Kk <Nkk> Production of high toughness high tensile steel plate

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2536765A1 (en) * 1982-11-29 1984-06-01 Nippon Kokan Kk PROCESS FOR MANUFACTURING STEEL PLATES HAVING HIGH TENSILE STRENGTH
JPS62158817A (en) * 1985-12-28 1987-07-14 Nippon Steel Corp Manufacture of thick steel plate having high strength and high toughness
JPH0196329A (en) * 1987-10-07 1989-04-14 Nippon Steel Corp Manufacture of steel for welding construction excellent in sulfide stress corrosion cracking resistance and having >=56kgf/mm2 tensile strength

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