JPS5633425A - Manufacture of tempered high tensile steel sheet having excellent low temperature toughness - Google Patents

Manufacture of tempered high tensile steel sheet having excellent low temperature toughness

Info

Publication number
JPS5633425A
JPS5633425A JP10777979A JP10777979A JPS5633425A JP S5633425 A JPS5633425 A JP S5633425A JP 10777979 A JP10777979 A JP 10777979A JP 10777979 A JP10777979 A JP 10777979A JP S5633425 A JPS5633425 A JP S5633425A
Authority
JP
Japan
Prior art keywords
temp
rolling
heated
high tensile
manufacture
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
JP10777979A
Other languages
Japanese (ja)
Other versions
JPS5740891B2 (en
Inventor
Tamotsu Hashimoto
Yasuo Otani
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 JP10777979A priority Critical patent/JPS5633425A/en
Publication of JPS5633425A publication Critical patent/JPS5633425A/en
Publication of JPS5740891B2 publication Critical patent/JPS5740891B2/ja
Granted legal-status Critical Current

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  • Heat Treatment Of Steel (AREA)

Abstract

PURPOSE: To manufacture tempered high tensile steel sheet excellent in low temp. toughness, by subjecting a steel material contg. a small quantity of Nb to the combination of controlled rolling and temper treatment under specific conditions.
CONSTITUTION: Steel contg. <0.20% C, <1.0% Si, <2.0% Mn, 0.015W0.10% Nb, 0.015W0.10% soluble Al, in addition at least one member among the group <1.0% Cu, <10% Ni, <2% Cr, <1.0% Mo, <0.10% V, <0.10% Ti, <0.01% B is heated to ≥1,200°C where nitride and carbonitride of Nb form soln. sufficiently and is primarily rolled, the rolling being discontinued when intermediate thickness of the plate is attained. After cooled to ≤Ar3 transformation temp., the steel is heated to 850W950°C and ≥Ac3 transformation temp., then it is rolled secondarily at ≥65% reduction ratio based on the finish thickness of the plate. In that case, it is subjected to rolling ≥50% reduction ratio at least at ≤800°C, in addition, the secondary rolling is completed of 750W680°C. Finally, after cooled once to a prescribed temp., it is heated to just above the Ac3 transformation temp. and is hardened and tempered.
COPYRIGHT: (C)1981,JPO&Japio
JP10777979A 1979-08-24 1979-08-24 Manufacture of tempered high tensile steel sheet having excellent low temperature toughness Granted JPS5633425A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10777979A JPS5633425A (en) 1979-08-24 1979-08-24 Manufacture of tempered high tensile steel sheet having excellent low temperature toughness

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10777979A JPS5633425A (en) 1979-08-24 1979-08-24 Manufacture of tempered high tensile steel sheet having excellent low temperature toughness

Publications (2)

Publication Number Publication Date
JPS5633425A true JPS5633425A (en) 1981-04-03
JPS5740891B2 JPS5740891B2 (en) 1982-08-31

Family

ID=14467797

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10777979A Granted JPS5633425A (en) 1979-08-24 1979-08-24 Manufacture of tempered high tensile steel sheet having excellent low temperature toughness

Country Status (1)

Country Link
JP (1) JPS5633425A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59140355A (en) * 1983-01-31 1984-08-11 Sumitomo Metal Ind Ltd Extremely thick steel plate with high toughness and tension
US4537644A (en) * 1981-09-28 1985-08-27 Nippon Steel Corporation High-tension high-toughness steel having excellent resistance to delayed fracture and method for producing the same
JPS60187664A (en) * 1984-03-01 1985-09-25 Nippon Steel Corp Electric welded oil well pipe having low hardness and high yield strength and its production
JPS60187663A (en) * 1984-03-01 1985-09-25 Nippon Steel Corp Electric welded oil well pipe having low hardness and high yield strength and its production
US4634573A (en) * 1981-09-10 1987-01-06 Daido Tokushuko Kabushiki Kaisha Steel for cold forging and method of making
JPS627761A (en) * 1985-06-24 1987-01-14 Asahi Chem Ind Co Ltd Mixed polyamide resin composition and melt-extrusion molded product of said composition
US4687525A (en) * 1984-09-03 1987-08-18 Hoesch Stahl Ag Worked low-temperature tough ferritic steel
US5827379A (en) * 1993-10-27 1998-10-27 Nippon Steel Corporation Process for producing extra high tensile steel having excellent stress corrosion cracking resistance
US7967923B2 (en) * 2008-10-01 2011-06-28 Nippon Steel Corporation Steel plate that exhibits excellent low-temperature toughness in a base material and weld heat-affected zone and has small strength anisotropy, and manufacturing method thereof

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4634573A (en) * 1981-09-10 1987-01-06 Daido Tokushuko Kabushiki Kaisha Steel for cold forging and method of making
US4537644A (en) * 1981-09-28 1985-08-27 Nippon Steel Corporation High-tension high-toughness steel having excellent resistance to delayed fracture and method for producing the same
JPS59140355A (en) * 1983-01-31 1984-08-11 Sumitomo Metal Ind Ltd Extremely thick steel plate with high toughness and tension
JPS60187664A (en) * 1984-03-01 1985-09-25 Nippon Steel Corp Electric welded oil well pipe having low hardness and high yield strength and its production
JPS60187663A (en) * 1984-03-01 1985-09-25 Nippon Steel Corp Electric welded oil well pipe having low hardness and high yield strength and its production
US4687525A (en) * 1984-09-03 1987-08-18 Hoesch Stahl Ag Worked low-temperature tough ferritic steel
JPS627761A (en) * 1985-06-24 1987-01-14 Asahi Chem Ind Co Ltd Mixed polyamide resin composition and melt-extrusion molded product of said composition
US5827379A (en) * 1993-10-27 1998-10-27 Nippon Steel Corporation Process for producing extra high tensile steel having excellent stress corrosion cracking resistance
US7967923B2 (en) * 2008-10-01 2011-06-28 Nippon Steel Corporation Steel plate that exhibits excellent low-temperature toughness in a base material and weld heat-affected zone and has small strength anisotropy, and manufacturing method thereof

Also Published As

Publication number Publication date
JPS5740891B2 (en) 1982-08-31

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