... coat,polish,zinc plated,acid pickling light galvanized u frame steel beams1.Strictly quality control by 100% inspection2.Small ... platform, garage, hardware, crane partsMaterialcarbon steel, stainless steel, aluminum alloy, copperProcedurewelding,stamping,cutting,punching,bending,grinding,machining,threadingSurface finishingzinc plating ... rolling machine and so on. light galvanized u frame steel beams