... through bending,forming, automatic welding, hot dip galvanization and powder coating. We owned advanced production-line, it included Flatting ... Auto-closed up machine, submerged arc welding machine and powder coating line, and our workmanship and quality control ... or American standard ASTM A123, IS: 2626-1985.Powder coatingPure polyester powder painting, color is optional according toRAL Color stardand ...