ASTM F73-96

Standard Specification for Tungsten-Rhenium Alloy Wire for Electron Devices and Lamps

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 the standard. The values given in parentheses are for information only.

General Information

• Status: Historical
• Publication Date: 09-Jun-1996
• Technical Committee: F01 - Electronics
• Drafting Committee: F01.03 - Metallic Materials, Wire Bonding, and Flip Chip

Relations

• Replaced By: ASTM F73-96(2002) - Standard Specification for Tungsten-Rhenium Alloy Wire for Electron Devices and Lamps
• Effective Date: 10-Jun-1996

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NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn.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: F 73 – 96
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
Tungsten-Rhenium Alloy Wire for Electron Devices and
1
Lamps
This standard is issued under the fixed designation F 73; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (e) indicates an editorial change since the last revision or reapproval.
TABLE 1 Chemical Requirements
1. Scope
Element Composition
1.1 This specification covers tungsten-rhenium alloy wire
Tungsten remainder
suitable for use in electron devices and lamps. The material is
Rhenium, % 2.5 to 3.5
known as UNS R07031.
Other elements (each), ppm, max 100
1.2 The term wire as used in this specification applies to all
Total other elements, ppm, max 500
material 0.020 in. (0.51 mm) or less in diameter that is spooled
or coiled.
mm) gage length of wire in grams-force per milligram per 200
1.3 The values stated in inch-pound units are to be regarded
mm shall be within the limits prescribed in Table 2, when
as the standard. The values given in parentheses are for
tested in accordance with 8.2.
information only.
5.2 General Ductility Requirements—The ductility of wire
shall be sufficient to meet the following requirements:
2. Referenced Documents
5.2.1 Wire Sizes up to 75 mg/200 mm, incl—Six 1-m lengths
2.1 ASTM Standards:
shall be tested in accordance with 8.3.1. The wire shall not
F 205 Test Method for Measuring Diameter of Fine Wire by
break more than two times in the six tests. Where required, a
2
Weighing
lower limit may be negotiated between purchaser and seller.
F 219 Methods of Testing Fine Round and Flat Wire for
5.2.2 Wire Sizes over 75 mg/200 mm—Thirty successive
2
Electron Devices and Lamps
close-wound turns completely around mandrels shall be free
from splitting or cracking when tested in accordance with 8.3.2
3. Ordering Information
and examined at a magnification of 303.
3.1 Orders for wire furnished to this specification shall
5.3 Special Ductility Requirements—Wire for certain appli-
include the following information:
cations requires a special ductility as agreed upon between the
3.1.1 Length in metres,
purchaser and the seller.
3.1.2 Name of material,
6. Size, Straightness, and Tolerances
3.1.3 Straightness (see 6.2),
3.1.4 Finish (see 7.2),
6.1 Dimensional tolerances for wire for use as incandescent
3.1.5 Weight or size (see 6.1) and tolerance, and
filaments shall conform to the requirements prescribed in Table
3.1.6 Specification number and UNS number.
3.
NOTE 1—A typical ordering description for straight chemically cleaned
NOTE 2—Tolerances are industry standards; closer tolerances may be
wire is as follows: xxxx metres tungsten-rhenium alloy wire, straightened,
obtained in certain instances, usually at a premium.
Finish 2; 280.8 mg/200 mm (6 3 %), per ASTM F73 – XX (UNS
6.2 Straightness—Straightness of wire 3.00 mg/200 mm
R07031).
and larger shall be specified as the radius of curvature or
4. Chemical Composition camber of a given length of wire as agreed upon between the
purchaser and supplier. For wire under 3.00 mg/200 mm,
4.1 This wire shall conform to the requirements as to
alternative methods may be used as agreed upon between the
chemical composition prescribed in Table 1.
purchaser and supplier.
5. Physical Properties
7. Workmanship, Finish, and Appearance
5.1 Tensile Strength—The tensile strength of a 10-in. (250-
7.1 General Requirements:
7.1.1 The material shall be as smooth, as free of twists,
1
This specification is under the jurisdiction of ASTM Committee F-1 on bends, curls, kinks, and as free, when examined at 303, from
Electronics and is the direct responsibility of Subcommittee F01.03 on Metallic
dents, swaging marks, scratches, swaging die marks, laps,
Materials.
seams, splits, slivers, inclusions, bumps, pits, grooves, cracks,
Current edition approved June 10, 1996. Published August 1996. Originally
and other physical defects as best commercial practice will
published as F 73 – 66 T. Last previous edition F 73 – 81 (1991).
2
Annual Book of ASTM Standards, Vol 10.04. permit.
1

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F73
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 A
...