CaSi alloy is the compound alloy which is composed by silicon, calcium and ferrum. It is an ideal compound deoxidizer and desulfurizer which can be widely used in the production of steels such as high-quality steel, low-carbon steel, stainless steel and special alloys such as Nickel base alloy, titanium base alloy. CaSi alloy can also be applied as the heat-raiser for converter steelmaking, the inoculant for cast iron production and addictive for nodular cast iron production.