1、Designation: F 73 96 (Reapproved 2009)Standard Specification forTungsten-Rhenium Alloy Wire for Electron Devices andLamps1This standard is issued under the fixed designation F 73; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the
2、 year of last revision. A number in parentheses indicates the year of last reapproval. A superscriptepsilon () 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 mate
3、rial isknown 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 S
4、I units 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 deter
5、mine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2F 205 Test Method for Measuring Diameter of Fine Wire byWeighingF 219 Test Methods of Testing Fine Round and Flat Wirefor Electron Devices and Lamps3. Ordering Information3.1 Orders for wire fur
6、nished to 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 st
7、raight chemically 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 Properti
8、es5.1 Tensile 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 follow
9、ing requirements: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 succes
10、siveclose-wound turns completely around mandrels shall be freefrom splitting or cracking when tested in accordance with 8.3.2and examined at a magnification of 303.5.3 Special Ductility RequirementsWire for certain appli-cations requires a special ductility as agreed upon between thepurchaser and th
11、e seller.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 Straightn
12、essStraightness of wire 3.00 mg/200 mmand larger shall be specified as the radius of curvature orcamber of a given length of wire as agreed upon between the1This specification is under the jurisdiction of ASTM Committee F01 onElectronics and is the direct responsibility of Subcommittee F01.03 on Met
13、allicMaterials.Current edition approved May 1, 2009. Published July 2009. Originally approvedin 1966. Last previous edition approved in 2002 as F 73 96 (2002).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of
14、ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.purchaser and supplier. For wire under 3.00 mg/200 mm,alternative methods may be used a
15、s agreed upon between thepurchaser and supplier.7. 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 303, fromdents, swaging marks, scratches, swaging die marks, laps,seams, splits,
16、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 surface defec
17、ts 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 an-nealed,
18、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 F 219. Use a flatblack background when testing fine
19、 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 overa 90 steel bar edge having a radius approximately equal to thediameter of the wire to be tested. Hold the wire against theedge of the bar with
20、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 completely aro
21、und 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, springs, an
22、chors, and meshshall be examined at a magnification of 103.8.5 Dimensional MeasurementsDetermine the apparentsize and the uniformity of wire up to 760 mg/200 mm inaccordance with Test Method F 205.9. Rejection9.1 Any spool of wire or individual cut pieces not conform-ing to the specified requirement
23、s may be rejected. If 15 % ormore 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 mayarrive a
24、t the manufacturers plant in the same condition as itleft.TABLE 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
25、/(mg/200 mm)High-Tensile 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 90T
26、ABLE 3 Permissible Variations 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 60.02 mg/200 mm 0.02 mg/200 mmOver 0.36 to 0.67, incl 60.03 mg/200 mm 0.02 mg/200 mmOver 0.67 to 2.0, incl 63 % by weight 0.02
27、mg/200 mmOver 2.0 to 760.0, incl 63 % by weight 1 %Over 760.0 61.5 % of diameter .F 73 96 (2009)210. 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 lengt
28、h andwound smoothly with no loose 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 si
29、zes of wireshall conform to the 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
30、wire for sizes over 50 to 100 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 20
31、0 mm or the diameter(in inches and millimetres), or both,11.1.3 Name of material and manufacturers process desig-nation,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
32、a packing slipplainly marked with 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 t
33、ransit or in handling. Nodusty 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; UNSR07031TABLE 4 Ductility Test ConditionsWire Diameter, in. (mm)Mandrel D
34、iameter,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 to0.51), incl0.045 (1.14) 600TABLE 5 Size of Spool, Band, or CoilFlange or Head Diameter, in. (mm) Mandrel or Hub Diameter,
35、in. (mm) Inside or Hole Diameter, in. (mm) Traverse, in. (mm)0.715 to 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) (15.7
36、5 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.
37、4)F 73 96 (2009)3ASTM International takes no position respecting the validity of any patent rights asserted in connection 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
38、 such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible 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 a
39、dditional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful 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
40、 the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 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 website(www.astm.org).F 73 96 (2009)4
