| 摘要 |
The steel composition comparises 0.02-0.15 % C, 0.03-0.50 % Si, 0.5-2.0 % Mn, at most 0.003 % P, 0.003-0.015 % S, at most 0.05 % Ni, 0.05-0.80 % Mo, 0.01-0.20 % V, 0.010-0.080 % Sol.Al, 0.0040- 0.010 % N, 0.0010-0.0050 % Ca, and balance Fe (all wt.%), with addition of 0.005-0.04 % Ti, 0.01-0.05 % Nb and 0.0005-0.0025 % B. Especially, the high strength steel does not produce stress corrosion crack at the weld zone in H2 atmosphere, and its tensile strength is over 60 kg/mm2.
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