| 摘要 |
PURPOSE:To obtain the titled steel, by adding specified ratios of C, Si, Mn, Ca, Ti, Zr, Al, P, S to Fe. CONSTITUTION:Steel consisting of, by weight 0.01-0.35% C, 0.02-0.5% Si, 0.1-1.8% Mn, 0.0005-0.008% Ca, 0.006-0.2% total of one kind or 2 kinds of Ti and Zr, further restricting to <=0.005% Al, <=0.015% P, <=0.003% S and the balance Fe with impurities is prepd. Further if necessary, one or >=2 kinds among 0.2-0.6% Cu, 0.1-1.0% Ni, 0.2-0.3% Cr, and/or one or >=2 kinds among 0.10-1.0% Mo, 0.01-0.15% Nb, 0.01-0.15% V are incorporated. By this way, steel having superior sour resistance and good low temp. toughness and without causing hydrogen blister cracking under circumstances of low pH is obtd.
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