| 摘要 |
In order to provide a method for producing machine parts from a high-hardness and highly corrosion resistant martensitic stainless steel, the present invention is characterized by production by means of a procedure for preparing a martensitic stainless steel, a procedure for quenching from 1030-1140°C, a subzero treatment procedure, and an annealing procedure. The components of the martensitic stainless steel include, by mass percent, 0.20%-0.40% C, 0.1% or less N, 3% or less Mo, and 12.0%-16.0% Cr, the remainder being substantially Fe and unavoidable impurities. 0.3%‰¤C+N‰¤0.4%, and the PI value (=Cr+3.3Mo+16N) is 18 or more. By means of the abovementioned procedures, machine parts can be produced from a high-hardness, highly corrosion-resistant martensitic stainless steel that has a surface layer prior austenite crystal grain size of 30-100 µm and a surface hardness (abbreviated below as hardness) of HRC 58-62. |
