JPS57134515A - Production of high tension bolt - Google Patents
Production of high tension boltInfo
- Publication number
- JPS57134515A JPS57134515A JP1850181A JP1850181A JPS57134515A JP S57134515 A JPS57134515 A JP S57134515A JP 1850181 A JP1850181 A JP 1850181A JP 1850181 A JP1850181 A JP 1850181A JP S57134515 A JPS57134515 A JP S57134515A
- Authority
- JP
- Japan
- Prior art keywords
- cold
- toughness
- strength
- reduction
- degraded
- 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
Abstract
PURPOSE: To obtain a nonrefined high tension bolt of high strength, high toughness and a long tool life by subjecting steel of specific composition to a constant temp. transformation treatment then cold drawing and cold forging thereby forming the bolt.
CONSTITUTION: After steel of 0.15W0.3% C and 1W2% Mn is heated to above the Ac3 transformation point (if necessary, it is cold-drawn at about ≤40% reduction of area), after which it is subjected to constant temp. transformation at 450W580°C. After cooling, it is cold-drawn at ≤40% reduction of area, whereby a bolt is formed. Here, the C is required above the lower limit in order to increase the strength and above the upper limit, toughness is lowered, and cold forgeability and tool life are degraded considerably. The Mn is required to be above the lower limit in order to assure the strength, and above the upper limit, the decreased effect of toughness improvement is resulted and the cold forgeability is degraded. The transformation treatment forms fine sorbite or mixed structure of this and bainite, and improves elongation and drawing. The drawing is required to improve the tensile strength to about ≥70kg/mm2 and if the reduction of area is in excess of 40%, the toughness is degraded.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1850181A JPS60406B2 (en) | 1981-02-10 | 1981-02-10 | Manufacturing method for high-tensile bolts |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1850181A JPS60406B2 (en) | 1981-02-10 | 1981-02-10 | Manufacturing method for high-tensile bolts |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57134515A true JPS57134515A (en) | 1982-08-19 |
JPS60406B2 JPS60406B2 (en) | 1985-01-08 |
Family
ID=11973368
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1850181A Expired JPS60406B2 (en) | 1981-02-10 | 1981-02-10 | Manufacturing method for high-tensile bolts |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60406B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59145734A (en) * | 1983-02-10 | 1984-08-21 | Nippon Steel Corp | Manufacture of high tensile bolt of not less than 70kg/mm2 tensile strength |
JPS59147738A (en) * | 1983-02-14 | 1984-08-24 | Nippon Steel Corp | Manufacture of high tensile bolt having tensile strength of above 80kg/mm2 |
US5366568A (en) * | 1993-10-13 | 1994-11-22 | Bruce Douglas G | Method of producing primarily tempered martensite steel |
JP2008261055A (en) * | 2008-05-26 | 2008-10-30 | Kobe Steel Ltd | High-toughness martensitic steel |
-
1981
- 1981-02-10 JP JP1850181A patent/JPS60406B2/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59145734A (en) * | 1983-02-10 | 1984-08-21 | Nippon Steel Corp | Manufacture of high tensile bolt of not less than 70kg/mm2 tensile strength |
JPS59147738A (en) * | 1983-02-14 | 1984-08-24 | Nippon Steel Corp | Manufacture of high tensile bolt having tensile strength of above 80kg/mm2 |
JPH0233771B2 (en) * | 1983-02-14 | 1990-07-30 | Nippon Steel Corp | |
US5366568A (en) * | 1993-10-13 | 1994-11-22 | Bruce Douglas G | Method of producing primarily tempered martensite steel |
JP2008261055A (en) * | 2008-05-26 | 2008-10-30 | Kobe Steel Ltd | High-toughness martensitic steel |
Also Published As
Publication number | Publication date |
---|---|
JPS60406B2 (en) | 1985-01-08 |
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