ASTM F288-96(2019)
(Specification)Standard Specification for Tungsten Wire for Electron Devices and Lamps
Standard Specification for Tungsten Wire for Electron Devices and Lamps
ABSTRACT
This specification covers three types of drawn pure and thoriated tungsten wire suitable for fabrication into parts for electron tubes, lamps, and other electron devices, and one type of rod for metal-to-glass sealing (grid wire is excepted): Type 1A, Type 1B, Type 2A, and Type 2B. Types 1A and 1B are designated as UNS R07005; Type 2A is designated as UNS R07911; and Type 2B is designated as UNS R07912. The wire and rod shall conform to the prescribed chemical requirements for thoria and tungsten and to the specified physical properties such as tensile strength, ductility, and surface defects. The weight/diameter conversion formulas are given. Wires shall be furnished in the following specified finishes: Finish 1, Finish 2, Finish 3, Finish 4, Finish 5, Finish 6, and Finish 7. The material shall be smooth, free of twists, bends, kinks, curls, and as free of dents, swaging marks, scratches, die marks, laps, seams, splits, slivers, inclusions, bumps, pits, grooves, cracks, and other physical defects Unless black finish is specified, all types of wire shall have a clean finish, free of graphite, grease, oil, and lubricants. Wire for hooks, supports, springs, anchors, and mesh shall have a bright smooth surface free of cracks holes, or craters. The requirements for straightness, and coiling and spooling are detailed as well. The following analysis and tests shall be performed: chemical analysis, tensile test, ductility test, visual inspection, dimensional measurements, and examination for surface flaws.
SCOPE
1.1 This specification covers three types of drawn wire suitable for fabrication into parts for electron tubes, lamps, and other devices; and one type of rod for metal-to-glass sealing (grid wire is excepted):
1.1.1 Type 1A—Commercially pure nonsag wire (Note 2 and Note 3).
1.1.2 Type 1B—Commercially pure rod suitable for metal-to-glass sealing.
1.1.3 Type 2A—Thoriated filament wire containing 1 % thoria.
1.1.4 Type 2B—Thoriated filament wire containing 2 % thoria.
1.2 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.
1.3 Types 1A and 1B are designated as UNS R07005. Type 2A is designated as UNS R07911. Type 2B is designated as UNS R07912.
1.4 The following precautionary caveat pertains only to the Chemical Analysis, Section 12 of this specification: 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
Note 1: A dimensional measurement method for testing nonsag tungsten wire above 0.030 in. (0.76 mm) in diameter is provided in Test Method F269.
Note 2: Acceptance of nonsag wire characteristics for particular applications of size shall be by agreement between producer and consumer based on either a flashed microstructure as shown by photomicrographs, or on dimensional measurement limits determined in accordance with Test Method F269.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:F288 −96 (Reapproved 2019)
Standard Specification for
1
Tungsten Wire for Electron Devices and Lamps
ThisstandardisissuedunderthefixeddesignationF288;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.1 This specification covers three types of drawn wire
ization established in the Decision on Principles for the
suitableforfabricationintopartsforelectrontubes,lamps,and
Development of International Standards, Guides and Recom-
other devices; and one type of rod for metal-to-glass sealing
mendations issued by the World Trade Organization Technical
(grid wire is excepted):
Barriers to Trade (TBT) Committee.
1.1.1 Type 1A—Commerciallypurenonsagwire(Note2and
Note 3).
2. Referenced Documents
1.1.2 Type 1B—Commercially pure rod suitable for metal-
2
to-glass sealing. 2.1 ASTM Standards:
1.1.3 Type 2A—Thoriated filament wire containing 1% F16Test Methods for Measuring Diameter or Thickness of
thoria. Wire and Ribbon for Electronic Devices and Lamps
1.1.4 Type 2B—Thoriated filament wire containing 2% F204Test Method for Surface Flaws in Tungsten Seal Rod
thoria. and Wire
F205Test Method for Measuring Diameter of Fine Wire by
1.2 Thevaluesstatedininch-poundunitsaretoberegarded
Weighing
as standard. The values given in parentheses are mathematical
F219Test Methods ofTesting Fine Round and FlatWire for
conversions to SI units that are provided for information only
Electron Devices and Lamps
and are not considered standard.
F269Test Method for Sag of Tungsten Wire
1.3 Types 1Aand 1B are designated as UNS R07005. Type
2.2 Military Standards:
2A is designated as UNS R07911. Type 2B is designated as
MIL-STD-105Sampling Procedures and Tables for Inspec-
UNS R07912.
3
tion by Attributes
3
1.4 The following precautionary caveat pertains only to the
MIL-STD-129Marking for Shipment and Storage
Chemical Analysis, Section 12 of this specification: This
standard does not purport to address all of the safety concerns,
3. Terminology
if any, associated with its use. It is the responsibility of the user
3.1 Definition of Terms Specific to This Standard:
of this standard to establish appropriate safety, health, and
3.1.1 wire—The term wire as used in this specification
environmental practices and determine the applicability of
applies to all drawn material that is spooled or coiled, and to
regulatory limitations prior to use.
short cut lengths 0.020 in. (0.51 mm) or less in diameter.
NOTE 1—A dimensional measurement method for testing nonsag
3.1.2 nonsag or doped tungsten wire—This term designates
tungsten wire above 0.030 in. (0.76 mm) in diameter is provided in Test
a wire which, when recrystallized, shows elongated interlock-
Method F269.
NOTE 2—Acceptance of nonsag wire characteristics for particular ing grains.
applicationsofsizeshallbebyagreementbetweenproducerandconsumer
3.1.3 rod—Thetermrodasusedinthisspecificationapplies
based on either a flashed microstructure as shown by photomicrographs,
to centerless ground material 0.020 in. (0.51 mm) or larger in
orondimensionalmeasurementlimitsdeterminedinaccordancewithTest
Method F269. diameter, in short cut lengths or random cut lengths.
1 2
This specification is under the jurisdiction of ASTM Committee F01 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Electronics and is the direct responsibility of Subcommittee F01.03 on Metallic contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Materials, Wire Bonding, and Flip Chip. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved April 1, 2019. Published April 2019. Originally the ASTM website.
3
approved in 1954. Last previous edition approved in 2014 as F288 – 96 (2014). AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
DOI: 10.1520/F0288-96R19. Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
F288−96 (2019)
4. Ordering Information 7.2 Out-of-roundness of wire or rod over 0.020 in. (0.51
mm)indiametershallbewithin5%ofthemaximumdiameter,
4.1 Orders for wire and rod furnished to this specification
when mea
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.