6
Pipes and tubes of metal, in particular centrifugally cast pipes with interior profiles for gas-cracking installations and steam cracking installations in the field of chemical plants, especially petro-chemical plants and fertilizer plants, and in the field of industrial furnaces, in particular for use in the radiant zones in steam cracker and steam reformer furnaces; crude and semi-wrought common metals and their alloys, in particular stainless steel; stainless steel castings and centrifugally cast, stainless steel pipes for use in chemical plants, especially petro-chemical plants and fertilizer plants, and in the field of industrial furnaces, in particular for use in the radiant zones in steam cracker and steam reformer furnaces; metal castings being shaped in the form of metal parts for industrial furnaces and furnace installations, for pumps in power stations and chemical works, for fittings in the chemical and plastics industries and for industrial furnace construction, shipbuilding and mechanical engineering; metal castings being shaped in the form of metal parts made from heat-resistant and wear-resistant special alloys for descaling installations in cement factories and ore-roasting installations
40
Treatment of materials, namely, treatment of metal
42
Engineering, in particular the design, calculation, in particular advance calculation, of industrial installations, in particular installations in the chemical and plastics industries, engineering drawings for industrial installations, in particular installations in the chemical and plastics industries; surveying; construction drafting, in particular for industrial installations, in particular installations in the chemical and plastics industries; technical project studies, namely, technical surveying; conducting measurements, namely, measurement evaluations for industrial installations, in particular installations in the chemical and plastics industries, in particular to define operational parameters for industrial installations; calculation of the operational ratings of industrial installations, in particular installations in the chemical and plastics industries, in particular calculation of efficiency ratings, namely, testing, analysis and evaluation of the goods and services of others for the purpose of centrifugation
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