... being used in rolling element bearings, valve seats, casters, ball bearings and valve parts.420C is a martensitic stainless steel with 12% Chromium ... chemical, paper and textile industries (valves, pumps and bearings).OUR MAIN PRODUCTS:Stainless steel ball:AISI302,304,316,420,4440CBearing steel balls ... ,G16,G14,G12,G10Any further Information,Plz contact us! 8mm High Quality Stainless steel ball