... valve,nail polish,air condition,medical material,automotive fittings.Material Composition % MaterialCSiMnPSNiCrMoAISI3040.07 max1.0 max2 ... type of modern steel and famous for its high corrosion resistant, wear resistance, strength and hardness ... or higher. Martensitic Grades are known for high hardness and allowances must be made for poor ... Information,Plz contact us! 8mm High Quality Stainless steel ball