Rolling member and its manufacturing method

摘要

Problem to be solved: to suppress the white structure formed by the use in the hydrogen permeation part, and to achieve the long life.Mass%C: 0.10-0.30%Si: 0.05 to 0.80%Mn: 0.40 to 1.00%P: 0.020% or lessS: 0.015% or lessCr: 0.60 to 1.50%Al: 0.005 to 0.100%N: 0.003 to 0.025%O: 0.0015% or lessIn the rolling parts made of steel of residual Fe and impuritiesAverage austenite grain size μ M or less;The residual austenite content is less than 20.0% in volume ratio.Rolling parts characterized by surface hardness of 750 HV or more.Diagram