JPS5454915A - Production of high-tensile steel plate having good cold toughness and weldability - Google Patents

Production of high-tensile steel plate having good cold toughness and weldability

Info

Publication number
JPS5454915A
JPS5454915A JP12096777A JP12096777A JPS5454915A JP S5454915 A JPS5454915 A JP S5454915A JP 12096777 A JP12096777 A JP 12096777A JP 12096777 A JP12096777 A JP 12096777A JP S5454915 A JPS5454915 A JP S5454915A
Authority
JP
Japan
Prior art keywords
steel
steel plate
cooled
weldability
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.)
Granted
Application number
JP12096777A
Other languages
Japanese (ja)
Other versions
JPS589815B2 (en
Inventor
Hajime Nakasugi
Hiroaki Masui
Hiroshi Tamehiro
Seiji Isoda
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
Nippon 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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP12096777A priority Critical patent/JPS589815B2/en
Publication of JPS5454915A publication Critical patent/JPS5454915A/en
Publication of JPS589815B2 publication Critical patent/JPS589815B2/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)

Abstract

PURPOSE:To obtain a steel plate having a good cold toughness and weldability and less expensive than Nb steel, a molten metal having a special composition is cooled at a particular rate, heated and rolled under a special condition. The steel includes C, Si, Mn, S, Al, Ti and the balance Fe. CONSTITUTION:A molten steel is treated which includes C:0.02 to 0.13%, Si: equals or less than 0.8%, Mn:1.0to 1.8%, S:equals or less than 0.010%, total Al: 0.005 to 0.08%, Ti:0.04 to 0.15% N:0.001 to 0.008%, the balance Fe and unavoideble impurities. The composition further satisfies relations such that o.01 <= Ti%- 3.4%<= 0.12 and Ti%/C% <= 4. The molten steel is cooled from a temperature just bolow liquid phase at a rate of 60 deg.C/min to 1000 deg.C at which temperature TiC (or TiCN) completely precipitates, and then cooled at any rate below 1000 deg.C until Ar1 point or below. The steel is then heated up to 1050 to 1250 deg.C and applied such condition that accumulated reduction below 850 deg.C reaches more than 50% and finishing temperature is 700 to 800 deg.C. The process provides a steel plate having characteristic with 85% ductile fracture in DWTT having a transition temperature below-10 deg.C and Charpy absorption energy in welding heat affected zone being more than 5kg-m at-10 deg.C.
JP12096777A 1977-10-11 1977-10-11 Manufacturing method of high-strength steel plate with excellent low-temperature toughness and weldability Expired JPS589815B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12096777A JPS589815B2 (en) 1977-10-11 1977-10-11 Manufacturing method of high-strength steel plate with excellent low-temperature toughness and weldability

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12096777A JPS589815B2 (en) 1977-10-11 1977-10-11 Manufacturing method of high-strength steel plate with excellent low-temperature toughness and weldability

Publications (2)

Publication Number Publication Date
JPS5454915A true JPS5454915A (en) 1979-05-01
JPS589815B2 JPS589815B2 (en) 1983-02-23

Family

ID=14799436

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12096777A Expired JPS589815B2 (en) 1977-10-11 1977-10-11 Manufacturing method of high-strength steel plate with excellent low-temperature toughness and weldability

Country Status (1)

Country Link
JP (1) JPS589815B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60204826A (en) * 1984-03-29 1985-10-16 Sumitomo Metal Ind Ltd Production of ti high tensile steel having excellent low- temperature toughness
JPS61264159A (en) * 1985-05-13 1986-11-22 Kobe Steel Ltd High-strength hot-rolled steel sheet of 55kgf/mm2 level for direct current butt welding
JPS61264160A (en) * 1985-05-13 1986-11-22 Kobe Steel Ltd High-strength hot-rolled steel sheet of 60kgf/mm2 level for direct current butt welding

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01147785U (en) * 1988-03-28 1989-10-12
JPH01144279U (en) * 1988-03-29 1989-10-03
JP4969275B2 (en) * 2007-03-12 2012-07-04 株式会社神戸製鋼所 High tensile steel plate with excellent toughness of weld heat affected zone

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60204826A (en) * 1984-03-29 1985-10-16 Sumitomo Metal Ind Ltd Production of ti high tensile steel having excellent low- temperature toughness
JPH0583606B2 (en) * 1984-03-29 1993-11-26 Sumitomo Metal Ind
JPS61264159A (en) * 1985-05-13 1986-11-22 Kobe Steel Ltd High-strength hot-rolled steel sheet of 55kgf/mm2 level for direct current butt welding
JPS61264160A (en) * 1985-05-13 1986-11-22 Kobe Steel Ltd High-strength hot-rolled steel sheet of 60kgf/mm2 level for direct current butt welding
JPH0581658B2 (en) * 1985-05-13 1993-11-15 Kobe Steel Ltd

Also Published As

Publication number Publication date
JPS589815B2 (en) 1983-02-23

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