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.
7.1 Steelmaking process
The steelmaking process is at the discretion of the steel or tube manufacturer with the exception that steel produced by 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 semikillcd steel.
7.2 Tube manufacture and delivery conditions
7.2.1 Tube manufacturing shall be as specified in Table 1.
Unless Option 1 is specified, the manufacturing process and route is at the discretion of the manufacturer.
Option 1: The manufacturing process and/or route from Table 1 is specified by the purchaser.
Electric welded tubes shall be manufactured by a process employing high frequency welding (HFW), of minimum frequency 100 kHz.
The submerged arc weld of SAW tubes shall be made using at least one weld run on the inside and one weld run on the outside of the tube.
The strip used for the manufacture of SAWH tubes shall have a width of not less than 0,8 times or more than 3.0 times the outside diameter of the tube.
The finished tubes shall not include the welds used to join together the strip or plate prior to forming. except for SAWH tubes to test category 1, where this Is permitted only when the welding procedure for the weld joining the strip or plate has been qualified in accordance with Annex A and has also been subjected to the same inspection and testing regime as the helical pipe welds and base material to test category 2 (see 11.12.2.3).
7.2.2 Tube production welding shall be carried out by qualified personnel in accordance with documented procedures. For tubes to be used in pressure equipment under European legislation, manufacturers shall employ an established procedure for the approval of welding operatives.
7.2.3 The welding procedure for SAW tubes shall be qualified in accordance with Annex A.
7.2.4 The production (welding) process for HFW tubes shall be qualified and approved under the tube manufacturer’s own QA system. Only HFW tubes (see 3.4) shall be supplied for pressure equipment under European legislation.
7.2.5 The delivery conditions for tubes covered by this document are shown in Table 1.
8.3 Grain size
Tubes shall have a ferritic grain size equal to or finer than 6, in accordance with EN ISO 643.This need not be verified unless Option 4 is specified.
Option 4: Grain size in accordance with EN ISO 643 shall be determined and reported.
8.4 Mechanical properties
The mechanical properties of the tubes, in a specified delivery condition from Table 1, shall conform to the requirements of Tables 4 and 7 plus the relevant additional tests specified in 11.3 to 11.7. irrespective of whether the test results are actually verified or not (see Table 15 for a summary of the inspection and verification testing required).
The tensile properties at elevated temperature, for tube in grades P355NH and P460N11, are given in Tables 5 and 6, These do not have to be verified unless Option 5 is specified. By agreement, these properties can also be applied to the corresponding low and special low temperature quality steels (P355NL1 and NL2 or P46ONL1 and NL2) if Option 6 is specified.
Option 5: Elevated temperature tensile properties for the tube, given in Tables 5 and 6, shall be verified for NH- grades either at 400 °C or at an alternative temperature agreed at the time of enquily and order.
Elevated temperature tensile properties for steel grades P275NL1 and P275NL2 are given in Annex B. These do not apply unless Option 6 is specified.
Option 6: Elevated temperature tensile properties for the tube shall be verified for NL grades, either at 400 “C
or at an alternative temperature agreed at the time of enquiiy and order. Values given in Tables 5 and 6 for
P355NH and P46ONH, shall be applied to the equivalent P3SSNL and P46ONL grades. Specified properties for
P275NL grades are set out in Annex B.BS/EN 10217-3-2019 pdf download.
BS/EN 10217-3-2019 pdf download
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