C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
154/143, 148/31,
C21D 8/00 (2006.01) C22C 38/12 (2006.01) E04B 1/94 (2006.01)
Patent
CA 1320110
PROCESS FOR MANUFACTURING BUILDING CONSTRUCTION STEEL HAVING EXCELLENT FIRE RESISTANCE AND LOW YIELD RATIO, AND CONSTRUCTION STEEL MATERIAL ABSTRACT OF THE DISCLOSURE Disclosed is a process for manufacturing a building construction steel having excellent high-temperature characteristics, which can be marketed at an economi- cally 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°C, followed by air cooling.
602362
Chiziiwa Rikio
Funato Kazuo
Keira Koichiro
Sakumoto Yoshifumi
Tamehiro Hiroshi
Goudreau Gage Dubuc
Nippon Steel Corporation
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