Si-Ca alloy,which is an ideal deoxidizer and desulfurizer,is composed of silicon,calcium and iron.It is widely used in the production of high quality steel,mild steel,stainless steel and nickel-base alloy,titanium-based alloys.It is aiso suitale for the training workshop as the heating agent and the additive in the producing of ductile casting iron,and inoculant of casting iron.Now,we began to use electro-silicothbrmic process in the production of Si-Ca alloy.