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 toughnessInfo
- 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
Links
Landscapes
- 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
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)
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 |
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 |
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 |
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 |
-
1979
- 1979-08-24 JP JP10777979A patent/JPS5633425A/en active Granted
Cited By (11)
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 |
JPH0210219B2 (en) * | 1983-01-31 | 1990-03-07 | Sumitomo Metal Ind | |
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 |
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 |
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 |
JPH0367547B2 (en) * | 1985-06-24 | 1991-10-23 | Asahi Chemical Ind | |
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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