40 Treatment of metals; treatment of steels; mechanical, thermomechanical or chemical transformation of the properties and characteristics of metals in the nature of the treatment of metals, namely, direct reduction of iron, metal tempering, finishing of metal surfaces, brazing, casting, anodizing, chromium plating, sintering, electrolytic zinc plating, phosphatizing, milling, shaping, tin-plating, galvanizing, nickel plating, laminating, armor plating, cutting, polishing, magnetizing, plating, cupping, stripping and soldering; shaping of metal products, namely, casting of metal; metal tempering; finishing of metal surfaces; galvanization; laminating of metal plates and metal sheets; cutting of metals; polishing of metals; metal plating; welding of metals; metal coating, namely, applying protective coatings to metal by means of galvanization; recycling of metal products; swaging, namely, forging of metal goods to the order and specification of others