| 摘要 |
PROBLEM TO BE SOLVED: To prevent any surface cracks generated in the edging by regulating the composition so as to contain Ti and Mg of specified quantity in a carbon steel having the composition consisting of C, Mn, Si, P, S, Al, N, O, Cu of respectively specified quantity, and the balance substantially Fe. SOLUTION: A molten steel whose composition is regulated to contain, by weight, 0.005-0.06% Ti and 0.0005-0.01% Mg in a carbon steel having the composition consisting of 0.001-0.5% C, 0.1-3% Mn, 0.005-2% Si, 0.001-0.1% P, 0.001-0.05% S, 0.001-0.1% Al, 0.0005-0.01% N, 0.0005-0.005% O, 0.05-2% Cu, and the balance substantially Fe, is continuously cast. This system is effective in a case where the carbon steel contains 0.05-2% one or more kinds of Nb, V, Cr, Mo, Ni, Zr, B and Ca. It is also effective in a case where the carbon steel contains <=0.1 % Sn.
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