Martensitic stainless steel parts and method for producing the same

摘要

Martensitic stainless steel parts applicable, for example, to cylinders and pistons in automobile fuel pump system or so, which have chemical compositions consisting of 0.3 to 0.6 % of C, not more than 1.0 % (preferably 0.25 %) of Si, not more than 1.0 % (preferably 0.4 %) of Mn, not more than 0.04 % (preferably 0.015 %) of P, not more than 0.03 % (preferably 0.01 %) of S, desirably not more than 0.003 % of O, 4.0 to 11.0 % of Cr, optionally one or both of not more than 1.0 % of Mo and 0.02 to 0.2 % of N, and which is subjected to induction hardening on contact surface thereof.