C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/117, 148/34.4
C22C 38/00 (2006.01) C21D 8/02 (2006.01)
Patent
CA 1084310
ABSTRACT OF THE DISCLOSURE High tension steel sheet having excellent low-tempera- ture toughness and a yield point not lower than 40 kg/mm2 is produced by heating a steel ingot or slab to a temperature not higher than 1150°C, and rolling the steel ingot or slab thus heated with a total reduction amount not less than 50% in a temp- erature range not higher than 930°C and a finishing temperature not higher than 830°C, the steel ingot or slab contains 0.01 to 0.13% C, 0.1 to 1.0% si, 0.7 to 2.0% Mn, not more than 0.1% total Al, 0.004 to 0.03% Ti, 0.001 to 0.0009% total N, 0.01 to 0.10% Nb, one or both of 0.01 to 0.15% V, 0.05 to 0.40% Mo, with the bal- ance being unavoidable impurities and Fe, in which (Nb%) x (C%) ? 5 x 10-3 and TiN is not larger than 0.02µ is not less than 0.004%; the steel sheet is useful in the manufacture of steel pipes, fittings and other components to be employed in cold regions.
275903
Eiro Seiji
Masui Hiroaki
Nakasugi Hajime
Takeda Tetuo
Tamehiro Hiroshi
Nippon Steel Corporation
Sherman
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