| 摘要 |
PURPOSE:To obtain a steel for high temp. use with superior toughness and weldability as well as superior strength at high temp. by specifying the composition of a steel consisting of C, Si, Mn, P, Cr, Mo, B, sol. Al and Fe. CONSTITUTION:This high-strength steel for high temp. use with superior toughness and wedability consists of, by weight, 0.01-0.09% C, 0.01-0.50% Si, 0.10- 3.00% Mn, <=0.020% P, 7.00-13.00% Cr, 0.50-3.00% Mo, 0.0002-0.0010% B, 0.01-0.05% sol. Al and the balance Fe with inevitable impurities. The steel may further contain one or more among 0.10-1.00% Cu, 0.10-1.00% Ni and 0.02- 0.05% Ti or one or more among 0.10-0.30% V, 0.04-0.10% Nb and 0.20-1.50% W. The steel is obtd. by adding said very small amount of B to a high-Cr steel for high temp. use so as to improve the hardenability and strength as well as the toughness and by reducing the C content so as to improve the weldability.
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