SB 668 - SPECIFICATION FOR UNS N08028 SEAMLESS TUBES SB-668...

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Unformatted text preview: SPECIFICATION FOR UNS N08028 SEAMLESS TUBES SB-668 01 (Identical with ASTM Specification B 668-99 except that certification has been made mandatory.) 1. Scope 1.1 This specification covers UNS N08028 seamless cold-finished tubes intended for general corrosive service. The general requirements are covered in Specification B 829. 1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only. 4.1.7 Samples for Product (Check) Analysis — State whether samples for product (check) analysis should be furnished, and 4.1.8 Purchaser Inspection — If the purchaser wishes to witness tests or inspection of material at the place of manufacture, the purchase order must so state, indicating which tests or inspections are to be witnessed. 2. Referenced Documents 5. Material and Manufacture 2.1 ASTM Standard: B 829 Specification for General Requirements for Nickel and Nickel Alloy Seamless Pipe and Tube 5.1 Tubes shall be made by the seamless process and shall be cold finished. 5.2 Tubes shall be furnished in the solution-annealed condition. NOTE 1 — The recommended heat treatment shall consist of heating the material to a temperature of 1975 to 2100°F (1080 to 1150°C) with subsequent quenching in water or rapidly cooling by other means. 3. General Requirement 3.1 Material furnished under this specification shall conform to the applicable requirements of Specification B 829 unless otherwise provided herein. 4. Ordering Information 5.3 The scale shall be removed by suitable means. When bright annealed, scale removal operations are not necessary. 4.1 Orders for material under this specification shall include the following information: 4.1.1 Alloy name or UNS number, 4.1.2 ASTM designation and year of issue, 4.1.3 Dimensions — Outside diameter, minimum or average wall thickness (in inches or millimetres, not gage number), and length (specific or random), 4.1.4 Quantity (feet or metres, or number of pieces), 4.1.5 Optional requirements, 4.1.6 Certification — Certification is required (Section 9), 848 6. Chemical Composition 6.1 The material shall conform to the requirement prescribed in Table 1. 6.1.1 A chemical analysis shall be made on each lot of material as described in Specification B 829. 6.2 If a product (check) analysis is performed by the purchaser, the material shall conform to Table 1 subject to the product (check) analysis variations prescribed in Specification B 829. COPYRIGHT American Society of Mechanical Engineers Licensed by Information Handling Services PART B — NONFERROUS MATERIAL SPECIFICATIONS TABLE 1 CHEMICAL REQUIREMENTS Element Carbon, max Silicon, max Manganese, max Phosphorus, max Sulfur, max Chromium Nickel Molybdenum Copper Iron A SB-668 7.1.1 One tension test shall be made on each lot of tubes. 7.2 Flaring Test — One flaring test shall be made on a specimen from one end of one tube from each lot of finished tubes. 7.3 Hydrostatic Test or Nondestructive Test: 7.3.1 Each tube shall be subjected to either the hydrostatic test or the nondestructive electric test at the manufacturer’s option. The purchaser may specify which test is to be used. Composition, % 0.030 1.0 2.50 0.030 0.030 26.0–28.0 30.0–34.0 3.0–4.0 0.6–1.4 RemainderA Determined arithmetically by difference. 8. Dimensions and Permissible Variations TABLE 2 TENSILE REQUIREMENTS Tensile Strength, min, ksi (MPa) 73 (500) Yield Strength, 0.2% Offset, min, ksi (MPa) 31 (214) Elongation in 2 in. (50.8 mm) or 4D, min, % 40 8.1 Outside Diameter and Wall Thickness — The permissible variations in the outside diameter and wall thickness of the tube shall not exceed those prescribed in Table 3. 9. Certification 7. Mechanical and Other Requirements 9.1 A manufacturer’s certification shall be furnished to the purchaser stating that the material has been manufactured, tested, and inspected in accordance with this specification, and that the test results on representative samples meet specification requirements. A report of the test results shall be furnished. 10. Keywords 7.1 The material shall conform to the mechanical properties prescribed in Table 2. One test is required for each lot, as defined in Specification B 829. 10.1 seamless tube; UNS N08028 TABLE 3 PERMISSIBLE VARIATIONS IN OUTSIDE DIAMETER AND WALL THICKNESS Wall Thickness, % Outside Diameter, in. (mm) Specified Outside Diameter, in. (mm) Up to 5⁄8 (15.9) excl 5 ⁄8 to 11⁄2 (15.9 to 38.1), incl Over 11⁄2 to 31⁄2 (38.1 to 88.9), incl Over 31⁄2 to 41⁄2 (88.9 to 114.3), incl Over 41⁄2 to 5 (114.3 to 127), incl Over 5 to 8 (127 to 203.2) incl + 0.005 0.0075 0.010 0.015 0.020 0.030 (0.13) (0.19) (0.25) (0.38) (0.51) (0.76) − 0.005 0.0075 0.010 0.015 0.020 0.030 (0.13) (0.19) (0.25) (0.38) (0.51) (0.76) + 15.0 10.0 10.0 10.0 12.5 12.5 Average − 15.0 10.0 10.0 10.0 12.5 12.5 Minimum Wall + 30.0 20.0 22.0 22.0 22.0 25.0 − 0 0 0 0 0 0 849 COPYRIGHT American Society of Mechanical Engineers Licensed by Information Handling Services ...
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This note was uploaded on 10/04/2010 for the course ENGINEERS 22453175 taught by Professor Heydari during the Spring '08 term at Miami University.

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