JPS648220A - Manufacture of steel having low yield point - Google Patents
Manufacture of steel having low yield pointInfo
- Publication number
- JPS648220A JPS648220A JP16138087A JP16138087A JPS648220A JP S648220 A JPS648220 A JP S648220A JP 16138087 A JP16138087 A JP 16138087A JP 16138087 A JP16138087 A JP 16138087A JP S648220 A JPS648220 A JP S648220A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- cementite
- yield point
- manufacture
- tempering
- 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.)
- Pending
Links
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
PURPOSE:To lower the yield point of a steel having a specified compsn. and a specified carbon equiv. while maintaining the mechanical properties on high levels, by quenching and tempering the steel under specified conditions so as to specify the structure and a precipitate. CONSTITUTION:A steel consisting of, by weight, 0.03-0.25% C, 0.03-0.5% Si, 0.20-1.8% Mn, 0.004-0.10% Al, 0.0001-0.005% N and the balance Fe and having <=0.45 Ceq. is quenched from the state of austenite and tempered at <=700 deg.C. By this method, a structure consisting of ferrite having many dislocations obtd. by releasing cementite from martensite during the tempering and of coagulated cementite which does not hinder the transfer of dislocations is formed and a precipitate other than ferrite and cementite is restricted to only AlN, so the yield ratio of the steel can be lowered to <=55%.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16138087A JPS648220A (en) | 1987-06-30 | 1987-06-30 | Manufacture of steel having low yield point |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16138087A JPS648220A (en) | 1987-06-30 | 1987-06-30 | Manufacture of steel having low yield point |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS648220A true JPS648220A (en) | 1989-01-12 |
Family
ID=15733991
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16138087A Pending JPS648220A (en) | 1987-06-30 | 1987-06-30 | Manufacture of steel having low yield point |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS648220A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5044333A (en) * | 1989-06-05 | 1991-09-03 | Yamaha Hatsudoki Kabushiki Kaisha | Balancing arrangement for internal combustion engine |
-
1987
- 1987-06-30 JP JP16138087A patent/JPS648220A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5044333A (en) * | 1989-06-05 | 1991-09-03 | Yamaha Hatsudoki Kabushiki Kaisha | Balancing arrangement for internal combustion engine |
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