STEEL FOR HEAT TREATMENT

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PROBLEM TO BE SOLVED : To provide a steel for heat treatment, regarding a Cr-Mo-containing steel, even in the case spheroidizing is performed so as to spheroidize carbide, in which the re-solid solution treatment of the carbide during heat treatment is easily progressed, and the retained carbides can be efficiently reduced. SOLUTION : The steel for heat treatment has a chemical composition comprising, by mass, 0.4 to 0.7% C, ≤0.5% Si, 0.2 to 1.2% M, ≤0.05% P, ≤0.02% S, 0.6 to 1.5% Cr, 0.02 to 0.4% Mo, and ≤0.2% sol.Al, and the balance Fe with impurities, and in which the ratio between the peek intensity (IM) of the (422) face of M23C6(wherein, M denotes Cr, Mo, Mn ad Fe) and the peak intensity (I[!theta!]) of the (211) face of cementite, (IM/I[!theta!]) in an X-ray diffraction test is ≤0.3. COPYRIGHT : (C)2010, JPO&INPIT