... instruments,chemical industry,plastic hard ware,scent bottle sprayer,valve,nail polish,air condition,medical material,automotive fittings. ... is being used in rolling element bearings, valve seats, casters, ball bearings and valve parts.420C is a martensitic stainless steel ... , pumps and bearings).OUR MAIN PRODUCTS:Stainless steel ball:AISI302,304,316,420,4440CBearing steel balls:AISIE52100Carbon steel ...