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Seamless steel tubes for pressure purposes. Technical delivery conditions - Alloy fine grain steel tubes Ingestion-build-207047 ISO 21905 specifies requirements and1 Scope This European Standard specifies the technical delivery conditions in two test categories for seamless tubes of circular cross section, made of weldable alloyed fine grained steel. NOTE Once this standard is published in the Official Journal of the European Union (OJEU) under Directive 97 23 EC, presumption of conformity to the Essential Safety Requirements (ESR) of Directive 97 23 EC is limited to technical data of materials in this standard