... coat,polish,zinc plated,acid pickling light galvanized u frame steel beams1.Strictly quality control by 100% ... moulds, auto parts, fifth wheel, lift platform, garage, hardware, crane partsMaterialcarbon steel, stainless steel, aluminum alloy, copperProcedurewelding, ... machine, punching machine, Welding robot, powder coat finishing line ,plasma cutting machine, hacksaw cutting machine, rolling machine ...