ASTM F73-96(2013)
(Specification)Standard Specification for Tungsten-Rhenium Alloy Wire for Electron Devices and Lamps
Standard Specification for Tungsten-Rhenium Alloy Wire for Electron Devices and Lamps
ABSTRACT
This specification covers tungsten-rhenium alloy wire suitable for use in electron devices and lamps. The material is known as UNS R07031. This wire shall conform to the requirements as to chemical composition prescribed. The wire shall be furnished in the following finishes: Finish 1; Finish 2; Finish 3; Finish 4; and Finish 5. The following test methods shall be performed to conform with the specified requirements: chemical analysis; tensile strength; ductility; visual inspection; and dimensional measurements.
SCOPE
1.1 This specification covers tungsten-rhenium alloy wire suitable for use in electron devices and lamps. The material is known as UNS R07031.
1.2 The term wire as used in this specification applies to all material 0.020 in. (0.51 mm) or less in diameter that is spooled or coiled.
1.3 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.
1.4 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.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F73 −96 (Reapproved 2013)
Standard Specification for
Tungsten-Rhenium Alloy Wire for Electron Devices and
Lamps
ThisstandardisissuedunderthefixeddesignationF73;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.6 Specification number and UNS number.
1.1 This specification covers tungsten-rhenium alloy wire
NOTE 1—Atypical ordering description for straight chemically cleaned
wireisasfollows:xxxxmetrestungsten-rheniumalloywire,straightened,
suitable for use in electron devices and lamps. The material is
Finish 2; 280.8 mg/200 mm (63%), per ASTM F73–XX (UNS
known as UNS R07031.
R07031).
1.2 The term wire as used in this specification applies to all
material0.020in.(0.51mm)orlessindiameterthatisspooled
4. Chemical Composition
or coiled.
4.1 This wire shall conform to the requirements as to
1.3 Thevaluesstatedininch-poundunitsaretoberegarded
chemical composition prescribed in Table 1.
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only
5. Physical Properties
and are not considered standard.
5.1 Tensile Strength—The tensile strength of a 10-in. (250-
1.4 This standard does not purport to address all of the
mm) gage length of wire in grams-force per milligram per 200
safety concerns, if any, associated with its use. It is the
mm shall be within the limits prescribed in Table 2, when
responsibility of the user of this standard to establish appro-
tested in accordance with 8.2.
priate safety and health practices and determine the applica-
5.2 General Ductility Requirements—The ductility of wire
bility of regulatory limitations prior to use.
shall be sufficient to meet the following requirements:
5.2.1 WireSizesupto75mg/200mm,incl—Six1-mlengths
2. Referenced Documents
shall be tested in accordance with 8.3.1. The wire shall not
2.1 ASTM Standards:
break more than two times in the six tests. Where required, a
F205Test Method for Measuring Diameter of Fine Wire by
lower limit may be negotiated between purchaser and seller.
Weighing
5.2.2 Wire Sizes over 75 mg/200 mm—Thirty successive
F219Test Methods ofTesting Fine Round and FlatWire for
close-wound turns completely around mandrels shall be free
Electron Devices and Lamps
fromsplittingorcrackingwhentestedinaccordancewith8.3.2
and examined at a magnification of 30×.
3. Ordering Information
5.3 Special Ductility Requirements—Wire for certain appli-
3.1 Orders for wire furnished to this specification shall
cations requires a special ductility as agreed upon between the
include the following information:
purchaser and the seller.
3.1.1 Length in metres,
3.1.2 Name of material,
6. Size, Straightness, and Tolerances
3.1.3 Straightness (see 6.2),
6.1 Dimensional tolerances for wire for use as incandescent
3.1.4 Finish (see 7.2),
3.1.5 Weight or size (see 6.1) and tolerance, and filamentsshallconformtotherequirementsprescribedinTable
3.
This specification is under the jurisdiction of ASTM Committee F01 on NOTE 2—Tolerances are industry standards; closer tolerances may be
Electronics and is the direct responsibility of Subcommittee F01.03 on Metallic obtained in certain instances, usually at a premium.
Materials.
6.2 Straightness—Straightnessofwire3.00mg/200mmand
Current edition approved May 1, 2013. Published May 2013. Originally
largershallbespecifiedastheradiusofcurvatureorcamberof
approvedin1966.Lastpreviouseditionapprovedin2009asF73–96(2009).DOI:
10.1520/F0073-96R13.
a given length of wire as agreed upon between the purchaser
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
and supplier. For wire under 3.00 mg/200 mm, alternative
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
methods may be used as agreed upon between the purchaser
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. and supplier.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F73−96 (2013)
TABLE 1 Chemical Requirements
Element Composition
Tungsten remainder
Rhenium, % 2.5 to 3.5
Other elements (each), ppm, max 100
Total other elements, ppm, max 500
TABLE 2 Tensile Properties for UNS R07031
Tensile Strength, gf/(mg/200 mm)
Weight of Wire, mg/200 mm High-Tensile Wire (Finishes 1 and 2) Medium-Tensile Wire (Finish 3)
Min Max Min Max
0.70 to 2.00, incl 85 120 75 105
Over 2.00 to 3.00, incl 75 110 70 100
Over 3.00 to 5.80, incl 65 105 60 100
Over 5.80 to 10.50, incl 75 110 70 100
Over 10.50 to 15.50, incl 70 105 65 95
Over 15.50 65 100 60 90
TABLE 3 Permissible Variations in Weight and Size for All Types of Wire
Weight 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 mm
Over 0.36 to 0.67, incl ±0.03 mg/200 mm 0.02 mg/200 mm
Over 0.67 to 2.0, incl ±3 % by weight 0.02 mg/200 mm
Over 2.0 to 760.0, incl ±3 % by weight 1 %
Over 760.0 ±1.5 % of diameter .
7. Workmanship, Finish, and Appearance 8.3.1 Wire up to 75 mg/200 mm, incl—Drawthewireovera
90° steel bar edge having a radius approximately equal to the
7.1 General Requirements:
diameter of the wire to be tested. Hold the wire against the
7.1.1 The material shall be as smooth, as free of twists,
edge of the bar with the thumb and draw the wire at an angle
bends, curls, kinks, and as free, when examined at 30×, from
of45°tothebaredgeatarateofapproximately1m/suntilthe
dents, swaging marks, scratches, swaging die marks, laps,
tension on the wire is sufficient to cause a tight helical coil to
seams, splits, slivers, inclusions, bumps, pits, grooves, cracks,
be formed after the tension is released (see 5.2.1).
and other physical defects as best commercial practice will
8.3.2 Wire over 75 mg/200 mm—Wind 30 successive close-
permit.
wound turns completely around mandrels of sizes as spec
...
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