... instruments,chemical industry,plastic hard ware,scent bottle sprayer,valve,nail polish,air condition,medical material,automotive fittings.Material ... the hardened, tempered and passivated condition. It allows creating a smooth polished surface and Razor sharp edges. It is ... used in rolling element bearings, valve seats, casters, ball bearings and valve parts.420C is a martensitic stainless steel with 12% ...