Statistical Classification of Economic Activities in the European Community – From the French, Nomenclature Statistique des activités économiques dans la Communauté européenne (NACE)
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NACE International – The National Association of Corrosion Engineers
Furthermore a PREN-value ≥ 40 for duplex steels is called for in the DIN EN ISO 15156 as well as the American NACE - a standard for use in hydrogen sulfide environments known in the oil and gas extraction industries.