Investment casting, also known as Lost Wax casting. Our company employs silica sol precision casting. The production process of this technology starts with using molten wax to injection - cast wax parts in a mold, which have the same shape as the casting. Then, layer - by - layer wrap the wax parts with high - temperature - resistant shell materials and dry them to form a shell. The shell is placed in a steam wax - melting furnace where the wax melts out. After that, pour molten steel into the shell. Once the molten steel cools and solidifies, remove the shell and molding sand, and the casting is obtained.