40 Processing and transformation of metal building materials, namely, treatment of ores and metals, namely, metal coating, all metal treating and all mechanical , thermo-mechanical or chemical transformations of the properties and characteristics of metal, metal tempering, metal treatment services, namely, finishing of metal surfaces, metal coating services, brazing, chromium plating, nickel plating, tin plating, zinc plating, galvanization, laminating, armor plating, cutting, burnishing by abrasion, polishing, magnetization, plating drawing, stripping finishes, welding of metals, recycling of metal goods and treatment of materials during the process for manufacturing metal goods, namely, machining and forming oxygen-cutting, pickling, welding, stamping, forging, pressing, deburring, machining, laminating, die-forging and shaping of metals, vacuum treatment and nitrogen case-hardening, assembly of metal sets and sections