... up to 56 HRC Rockwell or higher. Martensitic Grades are known for high hardness and allowances must be made for poor weld ability and ... their use in the chemical, paper and textile industries (valves, pumps and bearings).OUR MAIN PRODUCTS:Stainless steel ball:AISI302,304,316,420 ... ,G16,G14,G12,G10Any further Information,Plz contact us! 8mm High Quality Stainless steel ball