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
21、etely around mandrels of sizes as specifiedin Table 4 at the recommended forming temperatures. Splittingor cracking indicates failure (see 5.2.2).8.4 Visual InspectionCheck conformance of the wire tothe requirements specified in 7.1.2 by visual inspection, exceptthat wire used as hooks, supports, sp
22、rings, anchors, and meshshall be examined at a magnification of 10.8.5 Dimensional MeasurementsDetermine the apparentsize and the uniformity of wire up to 760 mg/200 mm inaccordance with Test Method F205.9. Rejection9.1 Any spool of wire or individual cut pieces not conform-ing to the specified requ
23、irements may be rejected. If 15 % orTABLE 1 Chemical RequirementsElement CompositionTungsten remainderRhenium, % 2.5 to 3.5Other elements (each), ppm, max 100Total other elements, ppm, max 500TABLE 2 Tensile Properties for UNS R07031Weight of Wire, mg/200 mmTensile Strength, gf/(mg/200 mm)High-Tensi
24、le Wire (Finishes 1 and 2) Medium-Tensile Wire (Finish 3)Min Max Min Max0.70 to 2.00, incl 85 120 75 105Over 2.00 to 3.00, incl 75 110 70 100Over 3.00 to 5.80, incl 65 105 60 100Over 5.80 to 10.50, incl 75 110 70 100Over 10.50 to 15.50, incl 70 105 65 95Over 15.50 65 100 60 90TABLE 3 Permissible Var
25、iations in Weight and Size for All Types of WireWeight of Wire, mg/200 mm Dimensional Tolerances Size Uniformity End-to-End (Within a Spool)Up to 0.36 0.02 mg/200 mm 0.02 mg/200 mmOver 0.36 to 0.67, incl 0.03 mg/200 mm 0.02 mg/200 mmOver 0.67 to 2.0, incl 3 % by weight 0.02 mg/200 mmOver 2.0 to 760.
26、0, incl 3 % by weight 1 %Over 760.0 1.5 % of diameter .TABLE 4 Ductility Test ConditionsWire Diameter, in. (mm)Mandrel Diameter,in. (mm)FormingTemperatureof Wire, C0.0065 to 0.010 (0.17 to 0.25),incl0.025 (0.64) 400Over 0.010 to 0.015 (0.25 to0.38), incl0.030 (0.76) 500Over 0.015 to 0.020 (0.38 to0.
27、51), incl0.045 (1.14) 600F73 96 (2013)2more of the spools of wire or cut pieces in any shipment do notconform to the specified requirements, the entire shipment maybe rejected.9.2 The purchaser shall return rejected material in a suitablecontainer for shipping, the original if possible, so that it m
28、ayarrive at the manufacturers plant in the same condition as itleft.10. Coiling and Spooling10.1 Spools and bands shall be clean and free from openseams or projections which might catch or tangle the wireduring winding.10.2 Wire shall be furnished in one continuous length andwound smoothly with no l
29、oose turns. There shall be no pilingup of turns such as to prevent free unwinding or cause kinks orbends when the wire is removed from the spool. The outer endshall be attached firmly to the spool or band by suitable means.10.3 The size of spool, band, or coil for all sizes of wireshall conform to t
30、he requirements specified in Table 5.10.4 Excepting Finish 5, no spools or bands in any oneshipment shall contain less than 100 m of wire for sizes 0.49mg/200 mm and under; not less than 200 m of wire for sizes0.50 mg to 50 mg/200 mm inclusive; and not less than 100 mof wire for sizes over 50 to 100
31、 mg/200 mm, inclusive. Forwire sizes above 100 mg/200 mm, each spool or band shallcontain not less than 50 g of wire.11. Product Marking11.1 Each spool or band shall be marked with the followinginformation:11.1.1 Name of manufacturer,11.1.2 Wire size in milligrams per 200 mm or the diameter(in inche
32、s and millimetres), or both,11.1.3 Name of material and manufacturers processdesignation,11.1.4 Manufacturers lot number of material and finishingdate,11.1.5 Quantity in metres, and11.1.6 Tensile strength of straightened wire.11.2 Each shipping container shall contain a packing slipplainly marked wi
33、th the following information:11.2.1 Purchasers order number,11.2.2 Purchasers specification,11.2.3 Gross weight and total metres, and11.2.4 Name of manufacturer.12. Packaging12.1 Each shipment shall be packaged in such a manner thatit will be protected from injury in transit or in handling. Nodusty
34、or linty material shall be used, nor any paperwrappingmaterial containing ingredients that would in any way beinjurious to the tungsten.13. Keywords13.1 electron devices; tungsten-rhenium alloy; UNSR07031ASTM International takes no position respecting the validity of any patent rights asserted in co
35、nnection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the respo
36、nsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful
37、 consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International,
38、100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM
39、 website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).TABLE 5 Size of Spool, Band, or CoilFlange or Head Diameter, in. (mm) Mandrel or Hub Diameter, in. (mm) Inside or Hole Diameter, in. (mm) Traverse, in. (mm)0.715 to
40、 0.785 0.580 to 0.605 0.437 to 0.450 0.420 to 0.430(18.16 to 19.94) (14.73 to 15.37) (11.10 to 11.43) (10.67 to 10.92)0.745 to 0.755 0.620 to 0.630 0.250 to 0.260 0.620 to 0.630(18.92 to 19.18) (15.75 to 16.00) (6.35 to 6.60) (15.75 to 16.00)1.88 to 2.38 1.13 to 1.63 0.375 0.75 to 1.00(47.8 to 60.5) (28.7 to 41.4) (9.52) (19.0 to 25.4)3.50 to 4.63 3.00 to 4.13 0.375 0.625(88.9 to 117.6) (76.2 to 104.9) (9.52) (15.88)4.00 to 4.75 3.88 to 4.00 3.50 to 3.88 0.75 to 1.00(101.6 to 120.6) (98.6 to 101.6) (88.9 to 98.6) (19.0 to 25.4)F73 96 (2013)3
