发明名称 |
High-toughness, high-tensile-strength steel and method of manufacturing the same |
摘要 |
High-tensile-strength steel having excellent arrestability and a TS of not less than 900 MPa, as well as a method of manufacturing the same. The steel of the invention has the following composition (% by weight): C: 0.02% to 0.1%; Si: not greater than 0.6%; Mn: 0.2% to 2.5%; Ni: greater than 1.2% but not greater than 2.5%; Nb: 0.01% to 0.1%; Ti: 0.005% to 0.03%; N: 0.001% to 0.006%; Al: not greater than 0.1%; and optional elements. Ceq of the B-free steel is 0.53-0.7%, and Ceq of the B-bearing steel is 0.4-0.58%. The microstructure of the steel may be a mixed structure of martensite (M) and lower bainite (LB) occupying at least 90 vol. % in the microstructure, LB occupying at least 2 vol. % in the mixed structure, and the aspect ratio of prior austenite grains is not less than 3.
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申请公布号 |
US6183573(B1) |
申请公布日期 |
2001.02.06 |
申请号 |
US20000482527 |
申请日期 |
2000.01.14 |
申请人 |
SUMITOMO METAL INDUSTRIES, LTD. |
发明人 |
FUJIWARA KAZUKI;OKAGUCHI SHUJI;HAMADA MASAHIKO;KOMIZO YU-ICHI |
分类号 |
C21D8/02;C22C38/00;C22C38/04;C22C38/08;C22C38/12;(IPC1-7):C22C38/08 |
主分类号 |
C21D8/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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