high quality Silicon metal 421 for Steel makingIts component, silicon content is at about 98% (during recent years , the product whose Si content is at 99.99% also can be included in metal Silicon), the balance impurity is Fe,Al,Ca and so on. Feature: Industrial silicon powder is regarded as alloy additive ,improve the steel hardenability in metallurgy and foundry industry . Uses:As non-ferrous alloy additives.      Grade Composition Si Impurities (%) Fe Al Ca ≤ 421 99.3 0.4 0.2 0.1 Size: 10-50mm,50-100mm or as customers' requirements. Packing: Ton parcel, 1000kg/bag