Pouring process refers to the method and technology of pouring the refined steel into steel ingot. The casting method can be divided into up-casting and down-casting according to the orientation of the molten steel entering the ingot mold. Steel grades such as stainless steel, silicon steel and sheet with strict surface quality requirements are down-casting. Steel grades such as heavy rail and gun tube with higher internal quality requirements are mostly up-casting. Small ingot can only bet, large ingot is suitable for betting.