40 Treatment of common metals and their alloys, and treatment of steel; processing of metals, namely, mechanical, thermomechanical or chemical changes to the properties and characteristics of metals, alloys and steels; direct reduction of iron, metal tempering, finishing surfaces of metals, brazing, casting, anodising, chrome plating, sintering, electrogalvanising, phosphatising, milling, forming, tin-plating, galvanisation, nickel plating, laminating, armour plating, cutting, burnishing, magnetisation, plating, drawing, pickling, and soldering of metals, metal coating, recycling of metal goods; treatment of materials during the manufacturing process for metal goods, namely, forging, pressing, deburring, machining, laminating and shaping of metals, vacuum treatment, nitriding, assembling of metal profiles