| 摘要 |
PURPOSE:To inexpensively obtain a member for wear- and pitting-resistant parts having excellent resistance to seizure by precipitating a hard carbide in the carburization of a steel consisting of specifically composed C, Si, Mn, Cr, Mo, and Fe. CONSTITUTION:The steel which contains 0.10-0.30wt%, more preferably 0.10-0.20% C, <=0.50%, more preferably <=0.15% Si, <=1.50%, more preferably <=0.80% Mn, 2.0-8.0% Cr, and 0.30-0.80% Mo, is controlled to <=0.015%, more preferably <=0.005% S, and <=0.0015% O according to need, further contains 0.03-0.10% Pb at need and consists of the balance Fe and inevitable impurities and, if necessary, the steel having excellent cold forgeability and machinability are used as the stock. The concn. of C of the atmosphere is adjusted to about >=1.3% in the carburization stage of the above-mentioned stock to precipitate the hard carbide on the surface part. About >=850 Hv hardness is thereby assured in the surface part and the material having the excellent resistance to wear, pitting, seizure, etc., is obtd.
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