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> |
申请人 |
NIPPON STEEL CORP., TOKIO/TOKYO, JP |
发明人 |
TAMEHIRO, HIROSHI, KIMITSU-SHI CHIBA, JP;CHIZIIWA, RIKIO, KIMITSU-SHI CHIBA, JP;SAKUMOTO, YOSHIFUMI, CHIYODA-KU-TOKYO, JP;FUNATO, KAZUO, KIMITSU-SHI CHIBA, JP;YOSHIDA, YUZURU, KIMITSU-SHI CHIBA, JP;KEIRA, KOICHIRO, CHIYODA-KU TOKYO, JP |