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ASTM B884-2019 pdf free download

ASTM B884-2019 pdf free download.Standard Specification for Niobium-Titanium Alloy Billets, Bar, and Rod for Superconducting Applications
1. Scope
1.1 This specification covers niobium-titanium alloy billets, bars, and rods, at 46 to 48 % titanium. This material is used in the manufacture of wire for superconducting applications. 1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.3 The following precautionary caveat pertains only to the test methods portion, Section 14, of this specification: This standard does not purport to address all ofthe safety concerns, ifany, associated with its use. It is the responsibility ofthe user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions ofTerms Specific to This Standard: 3.1.1 rod, n—material greater than 0.5 in. (13 mm) and less than 2.5 in. (60 mm) in diameter. 3.1.2 bar, n—material greater than or equal to 2.5 in (60 mm) and less than 6 in. (150 mm) in diameter. 3.1.3 billet, n—material greater than or equal to 6 in. (150 mm) in diameter. 3.1.4 lot, n—a lot shall consist of material of the same size, shape, condition, and finish produced from the same ingot or powder blend by the same reduction schedule and the same heat treatment parameters. Unless otherwise agreed between manufacturer and purchaser, a lot shall be limited to the product of an 8th period for final continuous anneal, or to a single furnace load for final batch anneal.
4. Ordering Information
4.1 Purchase orders for material under this specification should include: 4.1.1 ASTM designation and year of issue, 4.1.2 Quantity in weight, number ofpieces, and dimensions, 4.1.3 Grain size limit for diameters greater than 7.75 in. (see 7.2 and Table 1),4.1.4 Surface texture, if required (see 10.3), 4.1.5 Annealing condition, if different from 7.1, 4.1.6 Permissible variations in diameter and length (see 9.1 and 9.2), 4.1.7 Sampling and analytical methods, if required (see 11.3), 4.1.8 Inspection requirements (see Section 15), 4.1.9 Certification and report needs (see Section 17), and 4.1.10 Additions to the specification and supplementary requirements, as required.
5. Materials and Manufacture
5.1 Materials covered by this specification shall be made from ingots which are produced by vacuum, plasma-arc, or electron beam furnace melting, or a combination of these methods. All melting is to be carried out in furnaces usually used for reactive metals. 5.2 The products covered by this specification are formed with conventional forging, swaging, rolling, extruding, and drawing equipment normally available in metalworking plants.
6. Chemical Composition
6.1 The Nb-Ti alloy ingots, billets, and rods covered by this specification shall conform to the chemical composition limits shown in Table 2. 6.2 The manufacturer’s ingot analysis shall be considered the chemical analysis for the products supplied to this specification, except for the interstitials carbon, oxygen, nitrogen, and hydrogen. When specified in the purchase order, the analysis for these interstitials shall be measured on product.
10. Workmanship, Finish, and Appearance
10.1 Surface Condition—The finished material shall be free of visually detectable cracks, seams, slivers, blisters, laps, gouges, and other injurious imperfections. 10.2 Liquid Penetrant Examination—The surfaces of billet and bar shall be examined using liquid penetrant inspection methods (see 14.4). The following indications are unaccept- able: 10.2.1 Cracks, 10.2.2 Linear indications, 10.2.3 Rounded indications with dimensions exceeding 0.03 in. (0.8 mm), and 10.2.4 For sidewall surfaces only, rounded indications that are separated by less than 0.03 in. (0.8 mm) edge to edge. 10.3 Surface Finish—Surface finish shall be as specified in the purchase order (see 14.6). 10.4 Surface Preparation—The finished surface shall be pickled and rinsed in water. Removal of liquid penetrant test materials after pickling shall be by rinsing or additional pickling. 10.5 Cleanliness—Materials shall be clean to the extent that no contamination is visible to the unaided eye, corrected for 20/20 vision, when viewed under an illumination of at least 100 foot candles (1100 lux) on the surface being tested.

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