... parts 4.investment casting and machining Baoding Hairun Machi nery And Equipment Trading Co., Ltd. mostly produces steel casting, alloy steel casting, gray iron ... .PROCESSMATERIAL SANDResin SandGrey Iron, Ductile Iron, Malleable Iron, Stainless Steel, Carbon, Steel, Aluminum ,Brass, Bronze Clay Sand INVESTMENTSilica SolStainless Steel, Carbon Steel, Special Alloy Steel Bronze ,Brass, Aluminum ...