| 摘要 |
PROBLEM TO BE SOLVED: To obtain a clad steel plate excellent in low-temperature toughness at an HAZ (Heat Afect Zone) part. SOLUTION: The base material for clad steel plate has a composition which contains, by mass, 0.05 to 0.10% C, 0.10 to 0.30% Si, 1.30 to 1.60% Mn,≤0.015% P,≤0.002% S, 0.10 to 0.50% Ni,≤0.05% Cr, 0.005 to 0.030% Cu, 0.05 to 0.30% Mo, 0.015 to 0.040% V, 0.015 to 0.040% Nb, 0.005 to 0.020% Ti, 0.015 to 0.050% Al, 0.0010 to 0.0040% Ca and 0.0030 to 0.010% N and in which Ti/N is preferably made to a value ranging from 1.0 to 3.5. Low-temperature toughness in the heat affected zone can be greatly improved; and no additional heat treatment is required, which leads to a reduction in manufacturing costs. Moreover, HAZ hardness can be suppressed and cold cracking sensitivity at welding can be reduced. COPYRIGHT: (C)2004,JPO
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