... .80Appications:440C Stainless steel is a type of modern steel and famous for its high corrosion resistant, wear resistance, strength and hardness ... 56 HRC Rockwell or higher. Martensitic Grades are known for high hardness and allowances must be made for poor weld ability ... ,G16,G14,G12,G10Any further Information,Plz contact us! 8mm High Quality Stainless steel ball