发明名称 |
Process for manufacturing building construction steel having excellent fire resistance and low yield ratio, and construction steel material. |
摘要 |
<p>Disclosed is a process for manufacturing a building construction steel having excellent high-temperature characteristics, which can be marketed at an economically reasonable price. According to this process, a slab having a steel composition in which appropriate amounts of Mo and Nb are added to a low-C and low-Mn steel is heated at a high temperature and rolling is finished at a relatively high temperature, or a slab having a steel composition in which an appropriate amount of Mo is added to a low-C and low-Mn steel composition is heated at a high temperature, rolling is finished at a relatively high temperature, and at the subsequent air-cooling step, water cooling is started at a temperature of a ferrite fraction of 20 to 50% during the transformation from austenite to ferrite, water cooling is carried out to an arbitrary temperature lower than 550 DEG C, followed by air cooling.</p> |
申请公布号 |
EP0347156(A2) |
申请公布日期 |
1989.12.20 |
申请号 |
EP19890305942 |
申请日期 |
1989.06.13 |
申请人 |
NIPPON STEEL CORPORATION |
发明人 |
TAMEHIRO, HIROSHI;CHIZIIWA, RIKIO;SAKUMOTO, YOSHIFUMI;FUNATO, KAZUO;YOSHIDA, YUZURU;KEIRA, KOICHIRO |
分类号 |
C21D8/00;C22C38/12 |
主分类号 |
C21D8/00 |
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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