Manufacturing method of mechanical component using martensitic stainless steel, rotating device, rolling bearing and rolling bearing unit
Abstract:
A martensitic stainless steel containing, by mass %, C: 0.20% to 0.40%, N: 0.1% or less, Mo: 3% or less, and Cr: 12.0% to 16.0%, such that 0.3%≤C+N≤0.4% and a PI value (=Cr+3.3Mo+16N) is 18 or more, with the remainder being substantially Fe and unavoidable impurities is quenched from a temperature of 1,030° C. to 1,140° C. and subjected to a subzero treatment and tempering so as to obtain a prior austenite crystal grain size of a surface layer of 30 μm to 100 μm and a surface hardness of 58 HRc to 62 HRc.
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