This Part of EN 10217 specifies the technical delivery conditions for two test categories of electric welded tubes of circular cross section, with specified elevated temperature properties, made from non-alloy quality steel or alloy special steel. These tube grades are intended to support the essential requirements of EU Directive 97/23/EC in respect of pressure equipment with specified elevated temperature properties, covered under all relevant Categories as set out in Article 9 of that Directive NOTE Once this standard is published in the Official Journal of the European Union (OJEU), presumption of conformity to the Essential Safety Requirements (ESR) of Directive 97/23/EC is limited to the technical data for the materials in this standard and does not presume adequacy of the material for a specific item of pressure equipment. Consequently, the assessment of the technical data stated in this material standard against the design requirements of this specific item of equipment to verify that the ESRs of the Pressure Equipment Directive are satisfied, needs to be done by the designer or manufacturer of the pressure equipment, taking also into account the subsequent manufacturing processes which may affect properties of the base materials. NOTE For further information see the guideline of European Commission and the Member State for the Interpretation of Directive 97/23/EC, Annex I.