... :powder coat,polish,zinc plated,acid pickling light galvanized u frame steel beams1.Strictly quality control by ... alloy, copperProcedurewelding,stamping,cutting,punching,bending,grinding,machining,threadingSurface finishingzinc plating, hot dipped galvanized, powder coat, e-coat, ... CNC laser-cut machine, CNC flame-cut machine, CNC bending machine, CNC boring machine, punching machine, Welding robot, ...