... -2000 5) OEM is welcome Ningbo COSZO is specialized in producing kinds of investment casting spare parts, such as ... teeth. The materials we used for castings include carbon steel, alloy steel, stainless steel, refractory steel, ductile iron, etc. ... investment casting part: 1.Material: carbon steel, alloy steel, stainless steel, aluminum alloy, zinc alloy, brass, gray iron, nodular cast iron, ductile ...