Martensitic free-cutting stainless steel with excellent rolling fatigue life characteristics

摘要

PROBLEM TO BE SOLVED: To provide a martensitic free cutting stainless steel suitable for a member such a sliding member and a bearing to which rolling contact fatigue life characteristics and corrosion resistance is required, in particular, a member which undergoes cutting work, the martensitic free cutting stainless steel being excellent in rolling contact fatigue life characteristics and corrosion resistance.SOLUTION: The martensitic free cutting stainless steel excellent in rolling contact fatigue life characteristics is provided, containing, by mass%, C:0.50 to 1.20%, Si:0.10 to 0.60%, Mn:0.01 to 0.40%, P:≤0.040%, S:0.09 to 0.20%, Cr:9.00 to 17.00% and the balance Fee with inevitable impurities, having a relationship of Mn/S≤2.5, and further having 50 to 250 pieces of sulfide with major axis of 20 μm or more per 1 mmdispersed in a surface forming a rolling surface.SELECTED DRAWING: None