| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel to be induction-hardened which acquires superior workability and strength characteristics after having been induction-hardened, even though being in a state as hot-rolled. SOLUTION: The steel has a composition comprising, 0.40 to 0.55 mass% C, 0.16 to 0.25 mass% Si, 0.5 to 0.8 mass% Mn, 0.03 mass% or less P, 0.002 to 0.015 mass% S, 0.02 to 0.05 mass% Al, 0.06 to 0.15 mass% Cu, less than 0.1 mass% Cr, 0.002 to 0.005 mass% Sb, 0.0015 to 0.0050 mass% N, 0.015 to 0.030 mass% Ti, 0.001 to 0.003 mass% B so as to satisfy 0.1≤ä(Cu[mass%]+0.5)/Sb[mass%]}×B[mass%]≤1.0, and the balance Fe with unavoidable impurities. COPYRIGHT: (C)2010,JPO&INPIT
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