BS EN 10217‑3:2019 pdf download.Welded steel tubes for pressure purposes – Technical delivery conditions Part 3: Electric welded and submerged arc welded alloy fine grain steel tubes with specified room, elevated and 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 5.1.1 This document covers steel grades in four qualities (see Tables 2 and 4): — the basic quality (P … N); — the elevated temperature quality (P … NH); — the low temperature quality (P … NL1); — the special low temperature quality (P … NL2). 5.1.2 In accordance with the classification system in EN 10020, the tube grades in this standard are classified as follows: — P275NL1, P355N, P355NH and P355NL1 are alloy quality steels; — The other grades are alloy special steels. 5.2 Designation 5.2.1 For the tubes covered by this document, the steel designation consists of: — the number of this European Standard, e.g. EN 10217-3; 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 for the lowest applicable wall thickness (T) group expressed in MPa (see Table 4); — one of the additional symbols N, NH, NL1or NL2 (see 5.1.1, Tables 2 and 4).
6 Information to be supplied by the purchaser 6.1 Mandatory information The following information shall be supplied by the purchaser at the time of enquiry and order: a) the quantity (mass, total length or number of tubes of set length); b) the term ‘tube’ and tube type, HFW, SAWL or SAWH;c) the dimensions (outside diameter D, wall thickness T) (see Tables 8 and 9); d) the random length range (see 8.8.3); e) for tubes with a D/T > 100, out of roundness limits (see 8.8.4.6). f) the designation of the steel grade in accordance with this document (see 5.2); g) the test category (see 9.3). 6.2 Options A number of options are specified in this document and these are listed below. In the event that the purchaser does not indicate a wish to implement any of these options at the time of enquiry and order, the tubes shall be supplied in accordance with the basic specification (see 6.1). 1) Tube manufacturing process and/or route (see 7.2.1); 2) Restriction on copper and tin content (see Table 2); 3) Product analysis (see 8.2.2); 4) Determination of grain size according to EN ISO 643 (see 8.3); 5) Verification of elevated temperature mechanical properties for NH-grades (see 8.4); 6) Verification of mechanical properties at elevated temperature for NL-grades (see 8.4 and Annex B); 7) Selection of method for verification of leak-tightness (see 8.5.3.1); 8) Non-Destructive Testing of test category 2 HFW tubes for detection of transverse imperfections (see 8.5.3.2); 9) Non-Destructive Testing of test category 2 tubes for detection of laminar imperfections (see 8.5.3.2); 10) Special end preparation (see 8.7); 11) Exact lengths (see 8.8.3); 12) Inspection document 3.2 in place of the standard 3.1 Inspection Certificate (see 9.2.1); 13) Verification of tensile strength of the weld in the transverse direction for tubes with 219,1 < D ≤ 508 mm (see Table 15); 14) Additional verification of impact energy at a temperature different from the standard 15) Agreement of a different test pressure for hydrostatic leak-tightness test (see 11.9.1); 16) Wall thickness measurement away from the ends (see 11.10); 17) Non-Destructive Testing method for the inspection of the weld seam of HFW tubes (see 11.12.1.1); BS EN 10217‑3 pdf download.