ASTM B919-19 pdf download.Standard Specification for Welded Copper Heat Exchanger Tubes With Internal Enhancement.
Ordering Information
5.1 Include the following information when placing orders for product under this specification:
5.1.1 ASTM designation number and year of issue,
5.1.2 Copper UNS No.,
5.1.3 Tube type (Section 4),
5.1.4 Temper (Section 8),
5.1.5 Length, diameter, bottom-wall thickness, and en- hancement dimensions. Configuration of the enhanced surface shall be as agreed upon between the manufacturer, or supplier, and purchaser,
5.1.6 How furnished: straight or coils,
5.1.7 Quantity,
5.1.8 Cuprous oxide test, if required (12.3 and 16.1.4),
5.1.9 Certification, when required (Section 22), and
5.1.10 Mill test report, if required (Section 23).
6. Materials and Manufacture
6.1 Material:
6.1.1 The material of manufacture shall be sheet or strip, of the required alloy, and may be either cold worked or annealed.
6.1.2 The material shall be of such purity and soundness as to be suitable for processing into the product prescribed herein.
6.2 Manufacture: 6.2.1 The welded tube shall be manufactured from either cold rolled or annealed sheet or strip. The sheet or strip shall be formed into a tubular shape on a suitable forming mill.
6.2.2 Welding shall be accomplished by any process that produces forge or fusion welds leaving no crevice visible to the unaided eye in the weld seam. 6.2.2.1 Forge—Welded Tube—The edges of the strip shall be heated to the required welding temperature, usually by a high frequency electric current, and be pressed firmly together causing a forged-type joint to be formed with internal and external flash.
6.2.2.2 Fusion—Welded Tube—The edges of the tube shall be brought together and welded, usually by a GTAW welding process, without the addition of filler metal, causing a fusion- type joint to be formed with no internal or external flash. 6.2.2.3 Flash Removal—The external flash of forge welded tubes, if present, shall be removed by scarfing. The internal flash shall be treated by one of the following techniques: (1) IFI—internal flash to remain in the as-welded condition, (2) IFR—internal flash to be removed by scarfing, and (3) IFD— internal flash displaced by rolling or drawing.
6.2.3 The internal enhancement shall be produced by cold forming.
6.2.4 The longitudinal seam from welding shall be free of filler metal.
7. Chemical Composition
7.1 The material shall conform to the requirements in Table 1 for the copper specified in the contract or purchase order.
7.2 These compositional limits do not preclude the possible presence of other unnamed elements. When required, limits and analysis for unnamed elements shall be established by agreement between the manufacturer and the purchaser. 8. Temper 8.1 Tempers, as defined in Classification B601, of the various tube types are as follows: 8.1.1 As-Welded: 8.1.1.1 Annealed strip WM50, subsequently internally en- hanced by cold working and welded. 8.1.2 Welded and Annealed: 8.1.2.1 Annealed strip, internally enhanced by cold working, welded and soft annealed W060, and 8.1.2.2 Annealed strip, internally enhanced by cold working, welded and light annealed W050. N OTE 1—By agreement with the purchaser and manufacturer, product in special tempers may be supplied with properties as agreed upon between the purchaser and the manufacturer.
9. Grain Size for Annealed Tempers
9.1 Samples of annealed temper tubes shall be examined at a magnification of 75 diameters. The grain size shall be determined in the wall beneath the internal enhancement. The microstructure shall show complete recrystallization and shall have an average grain size within the limits specified in Table 2. 9.2 The surface of the test specimen for the microscopical examination shall approximate a radial longitudinal section of the tube. 10. Mechanical Properties 10.1 WM (as-welded) and WO (annealed) temper shall conform to the mechanical properties as specified in Table 2.
10.2 If disagreement arises between the grain size require- ment and the mechanical property requirements for annealed tempers, the mechanical property requirements take precedent.ASTM B919 pdf download.