ISO 9330-5:2000 pdf download

ISO 9330-5:2000 pdf download.welded steel tubes for pressurepurposes -Technical deliveryconditions — Part 5: Submerged arc-welded unalloyedand alloyed steel tubes with specifiedlow temperature properties.
5 Manufacturing process
5.1 Steelmaking process
If requested, the purchaser shall be informed of the steelmaking process used.
Steels may be cast in ingots or may be strand cast. When steels of different grades are sequentially strand cast identification of the resultant transition material is required. The producer shall remove the transition material by an established procedure that positively separates the grades.
5.2 Deoxidation process
Steels intended for the production of tubes covered by this part of ISO 9330 shall be fully-killed.
5.3 Product-making process for tubes
A welded tube is obtained by shaping a flat-rolled product and then welding the edges. The weld may be longitudinal or helical.
Tubes shall be submerged arc-welded (SAW) using at least one run on the inside and one run on the outside of the tube. Unless otherwise agreed, the process of manufacture is left to the discretion of the manufacturer, provided that the welding method and welder/welding operator have been approved in accordance with a qualified procedure.
Tubes covered by this part of ISO 9330 may be hot finished or cold finished. The terms “hot finished” and “cold finished” apply to the condition of the tube before it is heat treated, if applicable.
8.1 Appearance and soundness
8.1.1 The tubes shall be free from such defects as can be established by visual inspection and testing in accordance with this part of ISO 9330.
8.1.2 The tubes shall have a finish and internal and external surface condition typical of the manufacturing process and, when applicable, the heat-treated condition. The finish and surface condition shall permit surface imperfections or marks requiring dressing to be identified.
8.1.3 It shall be permissible to dress, by grinding or machining, surface marks and imperfections provided that the thickness of the tube after dressing does not fall below the minimum permitted wall thickness.
8.1.4 Surface imperfections which encroach on the minimum wall thickness shall be considered defects and shall be deemed not to comply with this part of ISO 9330.
8.1.5 All dressed areas shall blend smoothly into the contour of the tube.
8.1.6 The manufacturer shall explore, by grinding, a sufficient number of surface marks and imperfections identified during visual inspection to provide assurance that these have been evaluated to ensure compliance with 8.1.7.
8.1.7 The manufacturer shall, subject to the limitations given in 8.1.8, dress surface marks and imperfections found by exploration in accordance with 8.1 .6 to be deeper than 5 % of the specified thickness but not less than 0,5 mm.
8.1.8 If surface imperfections acceptable under 8.1.7 are not scattered and/or appear over a large area in excess of what is considered to be an acceptable surface condition then tubes shall be rejected or alternatively subjected to dressing as agreed upon between the purchaser and the manufacturer.
8.1.9 Repairs to the parent metal of the tubes shall only be carried out by grinding or machining. Peening or welding are not permitted.
NOTE Repairs to the weld seam are permitted, in accordance with an established procedure.
8.2 Preparation of ends
Tubes are normally delivered with square cut ends. By agreement between the purchaser and the manufacturer at the time of ordering they can also be delivered with bevelled ends, see ISO 6761. The ends shall be free from excessive burrs.
8.3 Delivery conditions
When the tubes are delivered in the heat-treated condition the parameters given in Table 2 shall apply.
9 Inspection and testing
9.1Type of inspection and testing
The inspection and testing procedure for deliveries in accordance with this part of lSO 9330 shall be as specified inISO 404.
9.2Types of the inspection document
Tubes delivered in accordance with this part of lSO 9330 shall be provided with an inspection certificate,3.1.B, inaccordance with ISO 10474, see 4.2.
NOTE lf inspection document 3.1.C or 3.2 is specified the purchaser should notify the manufacturer of the address of theorganization or person nominated by him to carry out the inspection and to produce the certificate of conformity.