... ISO 9001:2008/SGS test report/ROHS report Stainless steel ball Name: Stainless steel ballsMaterial: AISI304,316,420C,440CSize: ... used in rolling element bearings, valve seats, casters, ball bearings and valve parts.420C is a martensitic stainless steel with 12 ... in the chemical, paper and textile industries (valves, pumps and bearings).OUR MAIN PRODUCTS:Stainless steel ball:AISI302,304,316,420, ...