JPS6455335A - Production of high-tensile steel having low yield ratio - Google Patents

Production of high-tensile steel having low yield ratio

Info

Publication number
JPS6455335A
JPS6455335A JP62212591A JP21259187A JPS6455335A JP S6455335 A JPS6455335 A JP S6455335A JP 62212591 A JP62212591 A JP 62212591A JP 21259187 A JP21259187 A JP 21259187A JP S6455335 A JPS6455335 A JP S6455335A
Authority
JP
Japan
Prior art keywords
steel
temp
yield ratio
range
point
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
JP62212591A
Other languages
Japanese (ja)
Other versions
JPH066740B2 (en
Inventor
Nobuo Shikauchi
Hisatoshi Tagawa
Norihiro Iwasaki
Yutaka Osanawa
Tadao Sugiyama
Hiroshi Narita
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 Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan 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 NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP62212591A priority Critical patent/JPH066740B2/en
Publication of JPS6455335A publication Critical patent/JPS6455335A/en
Publication of JPH066740B2 publication Critical patent/JPH066740B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Heat Treatment Of Steel (AREA)

Abstract

PURPOSE:To stably obtain the title high-tensile steel having <=85% yield ratio and >=50kgf/mm<2> tensile strength and further high toughness by heating a low alloy steel slab to control the austenite grain size to less than a prescribed value, hot-rolling, cooling, and then annealing the steel in a specified temp. range. CONSTITUTION:A low alloy steel is heated to 950-1,250 deg.C, and firstly rolled at >=30% draft at a temp. range >=100 deg.C higher than the Ar3 point to control the austenite grain size to <=No.5. The sufficiently refined austenite is rolled at 10-60% draft at a temp. range from the Ar3 point to the temp. less than 100 deg.C higher than the Ar3 point in accordance with the desired yield ratio and tensile strength. The finish-rolled steel is then air-cooled for 10-80sec, and then cooled to <=500 deg.C at a cooling rate higher than the air cooling. The cooled steel is annealed, as required, in the temp. range 400 deg.C-Ac1 point, and the desired high-tensile steel having a low yield ratio is obtained.
JP62212591A 1987-08-26 1987-08-26 Low yield ratio thick wall high strength steel manufacturing method Expired - Fee Related JPH066740B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62212591A JPH066740B2 (en) 1987-08-26 1987-08-26 Low yield ratio thick wall high strength steel manufacturing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62212591A JPH066740B2 (en) 1987-08-26 1987-08-26 Low yield ratio thick wall high strength steel manufacturing method

Publications (2)

Publication Number Publication Date
JPS6455335A true JPS6455335A (en) 1989-03-02
JPH066740B2 JPH066740B2 (en) 1994-01-26

Family

ID=16625233

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62212591A Expired - Fee Related JPH066740B2 (en) 1987-08-26 1987-08-26 Low yield ratio thick wall high strength steel manufacturing method

Country Status (1)

Country Link
JP (1) JPH066740B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02282418A (en) * 1989-04-24 1990-11-20 Kawasaki Steel Corp Production of high tensile strength steel sheet excellent in internal quality and workability
JPH04202619A (en) * 1990-11-29 1992-07-23 Kobe Steel Ltd Production of 60kgf/mm2 class steel plate excellent in welding crack resistance and having low yield ratio
JPH0545802A (en) * 1991-08-13 1993-02-26 Fuji Photo Film Co Ltd Film unit with lens
JPH0665682A (en) * 1992-08-25 1994-03-08 Kobe Steel Ltd High tensile strength steel plate over 570n/mm2 class excellent in weldability and reduced in yield ratio
US5938865A (en) * 1995-05-15 1999-08-17 Sumitomo Metal Industries, Ltc. Process for producing high-strength seamless steel pipe having excellent sulfide stress cracking resistance
JP2005118886A (en) * 2004-12-06 2005-05-12 Jfe Steel Kk Manufacturing method of thin hot-rolled steel sheet

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5852423A (en) * 1981-09-21 1983-03-28 Kawasaki Steel Corp Manufacture of unnormalized high tensile boron steel with superior toughness at low temperature and superior weldability
JPS5877527A (en) * 1981-10-31 1983-05-10 Nippon Steel Corp Manufacture of high-strength and high-toughness steel
JPS5896817A (en) * 1981-12-07 1983-06-09 Sumitomo Metal Ind Ltd Production of high tensile hot rolled steel material having high toughness
JPS5896818A (en) * 1981-12-07 1983-06-09 Sumitomo Metal Ind Ltd Production of hot-rolled steel material having high strength and excellent low temperature toughness
JPS5983722A (en) * 1982-11-05 1984-05-15 Kawasaki Steel Corp Preparation of low carbon equivalent unnormalized high tensile steel plate

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5852423A (en) * 1981-09-21 1983-03-28 Kawasaki Steel Corp Manufacture of unnormalized high tensile boron steel with superior toughness at low temperature and superior weldability
JPS5877527A (en) * 1981-10-31 1983-05-10 Nippon Steel Corp Manufacture of high-strength and high-toughness steel
JPS5896817A (en) * 1981-12-07 1983-06-09 Sumitomo Metal Ind Ltd Production of high tensile hot rolled steel material having high toughness
JPS5896818A (en) * 1981-12-07 1983-06-09 Sumitomo Metal Ind Ltd Production of hot-rolled steel material having high strength and excellent low temperature toughness
JPS5983722A (en) * 1982-11-05 1984-05-15 Kawasaki Steel Corp Preparation of low carbon equivalent unnormalized high tensile steel plate

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02282418A (en) * 1989-04-24 1990-11-20 Kawasaki Steel Corp Production of high tensile strength steel sheet excellent in internal quality and workability
JPH04202619A (en) * 1990-11-29 1992-07-23 Kobe Steel Ltd Production of 60kgf/mm2 class steel plate excellent in welding crack resistance and having low yield ratio
JPH0545802A (en) * 1991-08-13 1993-02-26 Fuji Photo Film Co Ltd Film unit with lens
JPH0665682A (en) * 1992-08-25 1994-03-08 Kobe Steel Ltd High tensile strength steel plate over 570n/mm2 class excellent in weldability and reduced in yield ratio
US5938865A (en) * 1995-05-15 1999-08-17 Sumitomo Metal Industries, Ltc. Process for producing high-strength seamless steel pipe having excellent sulfide stress cracking resistance
JP2005118886A (en) * 2004-12-06 2005-05-12 Jfe Steel Kk Manufacturing method of thin hot-rolled steel sheet

Also Published As

Publication number Publication date
JPH066740B2 (en) 1994-01-26

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees