This preview shows page 1. Sign up to view the full content.
Unformatted text preview: SPECIFICATION FOR SEAMLESS UNS N08020, UNS N08026, AND UNS N08024 NICKEL-ALLOY PIPE AND TUBE
(Identical with ASTM Speciﬁcation B 729-99 except that certiﬁcation has been made mandatory.)
01 1. Scope 4. Ordering Information 1.1 This speciﬁcation covers UNS N08020, UNS N08026, and UNS N08024 seamless, cold-worked or hot-ﬁnished pipe and tube intended for general corrosive service. 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. 1.3 The following safety hazards caveat pertains only to the test methods portion, Section 10, of this speciﬁcation: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 4.1 Orders for materials 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 Finish. 4.1.4 Dimensions: 188.8.131.52 Tube — Specify outside diameter and the average or minimum wall thickness. 184.108.40.206 Pipe — Standard pipe size and schedule. 220.127.116.11 Length, (cut to length or random). 4.1.5 Quantity (feet or number of pieces). 4.1.6 Nondestructive Testing (see 7.2): 2. Referenced Documents 18.104.22.168 Pressure Requirements — Test pressure if other than required by 10.1. 22.214.171.124 Specify if an electric test is to be performed (see 7.2). 4.1.7 Ends — Plain ends cut and deburred will be furnished. If threaded ends or ends beveled for welding are desired, give details. 4.1.8 Certiﬁcation — Certiﬁcation is required (Section 11). 4.1.9 Samples for Product (Check) Analysis — State whether samples for product (check) analysis should be furnished (see 6.2).
929 2.1 ASTM Standards: B 829 Speciﬁcation for General Requirements for Nickel and Nickel Alloys Seamless Pipe and Tube E 8 Test Methods for Tension Testing of Metallic Materials 3. General Requirement 3.1 Material furnished under this speciﬁcation shall conform to the applicable requirements of Speciﬁcation B 829 unless otherwise provided herein. COPYRIGHT American Society of Mechanical Engineers Licensed by Information Handling Services SB-729 2001 SECTION II TABLE 1 CHEMICAL REQUIREMENTS
Composition, % Element Carbon, max Manganese, max Phosphorus, max Sulfur, max Silicon, max Nickel Chromium Molybdenum Copper Columbium (Nb) + tantalum Nitrogen Iron
A UNS N08026 0.03 1.00 0.03 0.03 0.50 33.00–37.20 22.00–26.00 5.00–6.70 2.00–4.00 ... 0.10–0.16 remainderA UNS N08020 0.07 2.00 0.045 0.035 1.00 32.00–38.00 19.00–21.00 2.00–3.00 3.00–4.00 8 × carbon–1.00 ... remainderA UNS N08024 0.03 1.00 0.035 0.035 0.50 35.00–40.00 22.50–25.00 3.50–5.00 0.50–1.50 0.15–0.35 ... remainderA By difference. 4.1.10 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. TABLE 2 MECHANICAL PROPERTY REQUIREMENTS
Tensile Strength, Yield Strength,A min min ksi 80 MPa 550 ksi 35 MPa 240 Elongation in 2 in. (50.8 mm) or 4D min, % 30.0 5. Materials and Manufacture A 5.1 The product of UNS N08020 alloy shall be furnished in the stabilized-annealed condition. The product of UNS N08026 alloy shall be furnished in the solution-annealed condition. The product of UNS N08024 alloy shall be furnished in the annealed condition.
NOTE 1 — The recommended annealing temperatures all followed by quenching in water or rapidly cooling by other means are as follows: 1800 to 1850°F (982 to 1010°C) for UNS N08020, 2050 to 2200°F (1121 to 1204°C) for UNS N08026, and 1925 to 1975°F (1052 to 1079°C) for UNS N08024. Yield strength shall be determined by the offset method at 0.2% limiting permanent set in accordance with Test Methods E 8. 7. Mechanical and Other Properties 7.1 Mechanical Properties — The material shall conform to the mechanical property requirements speciﬁed in Table 2. 7.2 Pressure and Nondestructive Electric Test — Each pipe and tube shall be subjected to either a pressure test or the nondestructive electric test at the manufacturer’s option. The purchaser may specify which test is to be used. 7.2.1 Any leaking areas may be cut out and the pipe retested as above. 7.2.2 Test signals produced by imperfections such as the following, may be judged as injurious or noninjurious, depending on visual observation of their severity or the type of signal they produce on the testing equipment used, or both. 126.96.36.199 Dinges,
930 6. Chemical Composition 6.1 The material shall conform to the composition limits speciﬁed in Table 1. One test is required for each lot as deﬁned in Speciﬁcation B 829. 6.2 If a product analysis is performed by the purchaser, the material shall conform to the composition limits speciﬁed in Table 1 subject to the product analysis tolerances speciﬁed in Table 1 of Speciﬁcation B 829. COPYRIGHT American Society of Mechanical Engineers Licensed by Information Handling Services PART B — NONFERROUS MATERIAL SPECIFICATIONS SB-729 188.8.131.52 Straightener marks, 184.108.40.206 Scratches, 220.127.116.11 Steel die stamps, and 18.104.22.168 Stop marks. psi (19 MPa) for all nominal sizes over 3 in. (76 mm). The allowable ﬁber stress for material in the condition (temper) furnished is 20 000 psi (138 MPa). 10.1.2 Visual examination is to be made when the material is under pressure. The full length of material must be examined for leaks. 10.1.3 When so agreed upon between the manufacturer and the purchaser, pipe or tube may be tested to one and one-half times the allowable ﬁber stress given in 10.1.1. 8. Sampling 8.1 Product (Check) Analysis shall be wholly the responsibility of the purchaser. 9. Number of Tests 9.1 Chemical Analysis — One test per lot. 9.2 Mechanical Properties — One test per lot. 9.3 Nondestructive Test — Each piece in each lot. 11. Certiﬁcation 11.1 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. Test Methods 12. Keywords 10.1 Hydrostatic Test: 10.1.1 Each pipe or tube shall be hydrostatically tested, at a pressure not to exceed 2500 psi (17 MPa) for nominal sizes 3 in. (76 mm) and under, nor 2800 12.1 nickel-iron-chromium-molybdenum-copper-columbium; seamless pipe; seamless tube; UNS N08020; UNS N08024; UNS N08026 931 COPYRIGHT American Society of Mechanical Engineers Licensed by Information Handling Services ...
View Full Document
- Spring '08