| 摘要 |
PROBLEM TO BE SOLVED: To produce steel parts having corrosion resistance of a certain degree, good in cold workability and warm forgeability, moreover having excellent machinability and whose surface hardness is controlled to >=630 HV by induction hardening and to provide a method for producing the same. SOLUTION: This steel parts are ones having a compsn. contg., by mass, 0.3 to 0.6% C, <=1.0% Si, <=1.0% Mn, <=0.04% P, 0.005 to 0.2% S, 4.0 to 11.0% Cr, 0.001 to 0.1% Al, 0.0005 to 0.02% Ca, 0.0005 to 0.01% O, and the balance substantial Fe, also contg. sulfides of >=5μm diameter equivalent to a circle contg. 0.1 to 10% Ca by >=5 pieces per 3.3 mm2, and in which the face to be used is subjected to induction hardening.
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