... Materials: AISI E52100Grade: Grade10 to Grade1000 Size: 0.5mmComplying to: ISO3290 reasonable pricechrome steel balls made ... /32") up to 1-1/2" GRADES:, 10, 25, 50, 100, 500, 1000, 2000 CHEMICAL COMPOSITION CHROMIUM1 ... CARBON.98% TO 1.05% MANGANESE0.25% TO 0.45% SILICON0.15% TO 0.35% PHOSPHOROUS0.010% MAX. SULPHUR0. ... CORROSION RESISTANCENO CORROSION RESISTANCE MAGNETIC 0.5mm steel ball coppered