[ Treatment of materials, namely, treating metal for producing pipes and tubes of metal, centrifugally cast pipes with interior profiles for gas-cracking installations and steam-cracking installations,] [ crude and semi-wrought common metals and their alloys, ] [ stainless steel, stainless steel castings and centrifugally cast, stainless steel pipes, metal castings being shaped metal parts for industrial furnaces and furnace installations, for] [ pumps in power stations and ] [ chemical works...