ASTM F73-1996(2013) Standard Specification for Tungsten-Rhenium Alloy Wire for Electron Devices and Lamps《电子器件及灯泡用钨铼合金丝的标准规范》.pdf
《ASTM F73-1996(2013) Standard Specification for Tungsten-Rhenium Alloy Wire for Electron Devices and Lamps《电子器件及灯泡用钨铼合金丝的标准规范》.pdf》由会员分享,可在线阅读,更多相关《ASTM F73-1996(2013) Standard Specification for Tungsten-Rhenium Alloy Wire for Electron Devices and Lamps《电子器件及灯泡用钨铼合金丝的标准规范》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: F73 96 (Reapproved 2013)Standard Specification forTungsten-Rhenium Alloy Wire for Electron Devices andLamps1This standard is issued under the fixed designation F73; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the y
2、ear of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers tungsten-rhenium alloy wiresuitable for use in electron devices and lamps. The material i
3、sknown as UNS R07031.1.2 The term wire as used in this specification applies to allmaterial 0.020 in. (0.51 mm) or less in diameter that is spooledor coiled.1.3 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI unit
4、s that are provided for information onlyand are not considered standard.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine t
5、he applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2F205 Test Method for Measuring Diameter of Fine Wire byWeighingF219 Test Methods of Testing Fine Round and Flat Wire forElectron Devices and Lamps3. Ordering Information3.1 Orders for wire furnished t
6、o this specification shallinclude the following information:3.1.1 Length in metres,3.1.2 Name of material,3.1.3 Straightness (see 6.2),3.1.4 Finish (see 7.2),3.1.5 Weight or size (see 6.1) and tolerance, and3.1.6 Specification number and UNS number.NOTE 1A typical ordering description for straight c
7、hemically cleanedwire is as follows: xxxx metres tungsten-rhenium alloy wire, straightened,Finish 2; 280.8 mg/200 mm (63 %), per ASTM F73 XX (UNSR07031).4. Chemical Composition4.1 This wire shall conform to the requirements as tochemical composition prescribed in Table 1.5. Physical Properties5.1 Te
8、nsile StrengthThe tensile strength of a 10-in. (250-mm) gage length of wire in grams-force per milligram per 200mm shall be within the limits prescribed in Table 2, whentested in accordance with 8.2.5.2 General Ductility RequirementsThe ductility of wireshall be sufficient to meet the following requ
9、irements:5.2.1 Wire Sizes up to 75 mg/200 mm, inclSix 1-m lengthsshall be tested in accordance with 8.3.1. The wire shall notbreak more than two times in the six tests. Where required, alower limit may be negotiated between purchaser and seller.5.2.2 Wire Sizes over 75 mg/200 mmThirty successiveclos
10、e-wound turns completely around mandrels shall be freefrom splitting or cracking when tested in accordance with 8.3.2and examined at a magnification of 30.5.3 Special Ductility RequirementsWire for certain appli-cations requires a special ductility as agreed upon between thepurchaser and the seller.
11、6. Size, Straightness, and Tolerances6.1 Dimensional tolerances for wire for use as incandescentfilaments shall conform to the requirements prescribed in Table3.NOTE 2Tolerances are industry standards; closer tolerances may beobtained in certain instances, usually at a premium.6.2 StraightnessStraig
12、htness of wire 3.00 mg/200 mm andlarger shall be specified as the radius of curvature or camber ofa given length of wire as agreed upon between the purchaserand supplier. For wire under 3.00 mg/200 mm, alternativemethods may be used as agreed upon between the purchaserand supplier.1This specificatio
13、n is under the jurisdiction of ASTM Committee F01 onElectronics and is the direct responsibility of Subcommittee F01.03 on MetallicMaterials.Current edition approved May 1, 2013. Published May 2013. Originallyapproved in 1966. Last previous edition approved in 2009 as F73 96 (2009). DOI:10.1520/F007
14、3-96R13.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive,
15、PO Box C700, West Conshohocken, PA 19428-2959. United States17. Workmanship, Finish, and Appearance7.1 General Requirements:7.1.1 The material shall be as smooth, as free of twists,bends, curls, kinks, and as free, when examined at 30, fromdents, swaging marks, scratches, swaging die marks, laps,sea
16、ms, splits, slivers, inclusions, bumps, pits, grooves, cracks,and other physical defects as best commercial practice willpermit.7.1.2 Unless black finish is specified, all types of wire shallbe free of graphite, grease, and oil. All finishes shall be as freeof dirt, oxide, stains, scale, and other s
17、urface defects as bestcommercial practice permits. Refer to 8.4 for inspectionmethods.7.2 FinishThe wire shall be furnished in the followingfinishes:7.2.1 Finish 1Black,7.2.2 Finish 2Chemically cleaned,7.2.3 Finish 3Chemically cleaned and stress relieved,7.2.4 Finish 4Reducing atmosphere cleaned and
18、annealed, or7.2.5 Finish 5Etched.8. Test Methods8.1 Chemical AnalysisDetermine gravimetrically or by acombination of spectrochemical and gravimetric analyses.8.2 Tensile StrengthDetermine the tensile strength of thewire in accordance with Section 8 of Method F219. Use a flatblack background when tes
19、ting fine wire below 0.005 in. (0.13mm) in diameter.8.3 DuctilityDetermine the ductility of the wire as fol-lows:8.3.1 Wire up to 75 mg/200 mm, inclDraw the wire over a90 steel bar edge having a radius approximately equal to thediameter of the wire to be tested. Hold the wire against theedge of the
20、bar with the thumb and draw the wire at an angleof 45 to the bar edge at a rate of approximately 1 m/s until thetension on the wire is sufficient to cause a tight helical coil tobe formed after the tension is released (see 5.2.1).8.3.2 Wire over 75 mg/200 mmWind 30 successive close-wound turns compl
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