SUS440F standard: JIS 


 ● Features and Scope: SUS440A stainless steel hardened state, the hard, but better than SUS440B, 11Cr17 toughness. SUS440A stainless steel for cutting tools, measuring tools, bearings. SUS440B stainless steel hardened state than SUS440A hard, but higher than SUS440C toughness. SUS440B stainless steel for cutting tools, valve. SUS440C are martensitic stainless steel, all stainless steel, heat-resistant steel has the highest hardness (up to HRC58 or more), used nozzle and bearing components, corrosion resistance and hardness of the mold and other components. SUS440F SUS440C is to improve the performance of steel-cutting steel. For automatic lathes. 


 ● Chemical Composition: C: 0.95 ~ 1.20 Si Si: ≤ 1.00 Manganese Mn: ≤ 1.25 S S: ≥ 0.15 P P: ≤ 0.060 Cr-Cr: 16.00 ~ 18.00 Ni: to allow containing ≤ 0.60 Mo Mo: ≤ 0.75 can be added