BS EN 10217-4:2019 pdf download.Welded steel tubes for pressure purposes – Technical delivery conditions Part 4: Electric welded non-alloy steel tubes with specified low temperature properties.
4 Symbols For the purposes of this document, the symbols given in EN 10266 apply.
5 Classification and designation 5.1 Classification In accordance with the classification system in EN 10020, the steel grades given in Tables 2 and 4 are classified as non-alloy quality steels. 5.2 Designation 5.2.1 For the tubes covered by this document, the steel designation consists of: — the number of this document; plus either: — the steel name in accordance with EN 10027-1; or: — the steel number allocated in accordance with EN 10027-2. 5.2.2 The steel name is designated by: — the capital letter P for pressure purposes; — the indication of the specified minimum yield strength at room temperature for thickness less than or equal to 16 mm, expressed in MPa (see Table 4); — the symbol N to designate normalized delivery condition (see Table 1); — the symbol L for low temperature.
7 Manufacturing process 7.1 Steelmaking process The steelmaking process is at the discretion of the manufacturer with the exception that the open hearth (Siemens-Martin) process shall not be employed unless in combination with a secondary steelmaking or ladle refining process. Steels shall be fully killed and contain nitrogen binding elements, details of which shall be reported. NOTE This excludes the use of rimming, balanced or semi-killed steel. 7.2 Tube manufacture and delivery conditions 7.2.1 The tubes shall be manufactured by an electric welding process employing high frequency welding (HFW), of minimum frequency 100 kHz in accordance with one of the manufacturing routes specified in Table 1. Unless Option 1 is specified the manufacturing route is at the discretion of the manufacturer. Option 1: The manufacturing route from Table 1 is specified by the purchaser. The finished tubes shall not include the welds used to join together the lengths of the strip prior to forming. 7.2.2 Tube production welding shall be carried out by suitably qualified personnel in accordance with documented procedures. For tubes intended for use in pressure equipment under European legislation, manufacturers shall employ an established procedure for the approval of welding operatives. The production (welding) process for HFW tubes shall be qualified and approved under the tube manufacturer’s own QA system. 7.2.3 The delivery conditions of tubes covered by this document are shown in Table 1.
8 Requirements 8.1 General The tubes shall conform to the requirements of this document when supplied in a delivery condition in accordance with Table 1 and inspected in accordance with the specified requirements in Table 10. Tubes shall be suitable for hot and cold bending. In addition, the general technical delivery requirements specified in EN 10021 shall apply. 8.2 Chemical composition 8.2.1 Cast analysis The cast analysis reported by the steel producer shall apply and conform to the requirements of Table 2.BS EN 10217-4 pdf download.