| 摘要 |
PROBLEM TO BE SOLVED: To provide inexpensive steel for a cargo oil tank which has excellent corrosion resistance. SOLUTION: (1) The steel has a composition containing 0.01 to 0.3% C, 0.02 to 1% Si, 0.05 to 2% Mn, <=0.05% P, <=0.01% S and 0.03 to 3% Ni, and the balance Fe with impurities, and, Mo, Cu, Cr, W, Ca, Ti, Nb, V, B, Sb, Sn and Al can be contained therein. (2) The steel has a composition containing 0.01 to 0.3% C, 0.02 to 1% Si, 0.05 to 2% Mn, <=0.05% P, <=0.01% S, 0.01 to 3% Ni, 0.01 to 2% Cu, <=0.05% Cr and <=0.07 Al, and the balance Fe with impurities, and in which the number of inclusion particles with a grain diameter of >30μm is <30 pieces per cm<2> , and, provided that Ap denotes the ratio in the % unit of pearlite occupied in the structure, and C denotes the content of carbon in mass%, A/C<=130 is satisfied. The steel can contain Mo, Cu, W, Ca, Ti, Nb, V, B, Sb and Sn.
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