420C stainless steel balls are primarily used in Special bearings, anti-friction bearings, special pumps, recirculating balls, medical instruments, lighters, automotive seat-belts, oil refinery devices and components. 420C stainless steel balls. This type of stainless steels has good resistance against corrosion together with the high hardness. The balls made of this material are suitable for valves, special bearing etc., in which the protection against rustproof-grease is poor or absent. Their resistance against corrosion caused by water, steam, air, is good. This kind of steel is not suitable to be used with chemical agents like sea water and strong acids (even if diluted). 420C is similar to 420. It has a higher C chemical content, so the hardness is also higher than 420.
