Characteristics Ferro Silicon ( FeSi ) used as deoxidizer and alloying agents in the steel industry. In order to obtain qualified chemical composition and guarantee the quality of steel, in the last stage of the steel must be deoxidized. The chemical affinity between silicon and oxygen is very large, Thus ferrosilicon is strong deoxidizer used in sedimentation and diffusion deoxidation of steel-making. Add a certain amount of silicon in the steel, can significantly improve the strength, hardness and elasticity of steel. Standard Grade Chemical Element (%) Si Al S P C â?¥(Min) â?¤(Max) FeSi65 65 2.0 0.02 0.04 0.2 FeSi70 70 2.0 0.02 0.04 0.2 FeSi72 72 2.0 0.02 0.04 0.2 FeSi75 75 2.0 0.02 0.04 0.2 Size: 10-50mm; etc. The content packaging particle size may be based on customer demand production.