Silicon Content: 65, 70, 72, 73, 75. Origin: Qinghai, Inner Mongolia, Ningxia, Fugu. In the torch steel, silicon iron is used for sedimentation and diffusion deoxidation, and also serves as an alloying agent in steelmaking. It improves cast iron properties, significantly enhancing the strength, hardness, and elasticity of steel, increasing its magnetic permeability, and reducing the hysteresis loss of transformer steel.