Refined silicon in metallic silicon metal has a Si content of at least 99%, and unrefined silicon has a Si content of at least 97%.Si 97 is a metallurgical grade silicon metal, an ideal substitute for 553 silicon metal.
Off grade silicon metal, also called low-grade silicon metal, silicon metal slag, a by-product in the manufacture of silicon metal. The silicon content of off grade silicon metal is 45% to 97%, and the rest is C, S, P, Al, SiO2, Fe, Ca, etc.
Silicon Metal 2202 is high grade silicon metal.It's silicon content is above 99.5%. The ferro content is 0.2%, the aluminum content is 0.2%, and the calcium content is 0.02%. The size of silicon metal grade 2202 is 10-100mm.
Silicon metal 3303 (Si) is an industrial purified single silicon, which is mainly used for the production of silicone, the preparation of high-purity semiconductor materials and the preparation of special-purpose alloy.
Metallurgical grade silicon metal 441, with a silicon content of 99%. The contents of iron, aluminum, and calcium are 4%, 4%, and 1%.
Silicon metal is an essential element in steelmaking. Silicon metal 441 has a higher silicon content. So it can be used as an iron alloy additive in the steelmaking industry. The price of silicon metal 441 is higher than metal silicon metal 553, but the quality is better.
Silicon metal 553 is a commonly used grade silicon metal. In the silicon metal 553, the silicon content should be as high as 98.5%. The contents of iron, aluminum, and calcium are 0.5%, 0.5%, and 0.3% respectively.
Silicon metal is a non-ferrous alloy product that is gray, hard and fragile. According to its use, there are chemical silicon metal and industrial silicon. Nowadays industrial silicon is widely used in aluminum industry, steelmaking, iron-based alloy additives, etc.