ASTM B365-98
(Specification)Standard Specification for Tantalum and Tantalum Alloy Rod and Wire
Standard Specification for Tantalum and Tantalum Alloy Rod and Wire
SCOPE
1.1 This specification covers unalloyed and alloyed tantalum rod and wire.
1.2 The materials covered by this specification are:
1.2.1 R05200, unalloyed tantalum, electron-beam furnace or vacuum-arc melt, or both,
1.2.2 R05400, unalloyed tantalum, powder-metallurgy consolidation,
1.2.3 R05255, tantalum alloy, 90% tantalum 10% tungsten, electron-beam furnace or vacuum-arc melt, or both,
1.2.4 R05252, tantalum alloy, 97.5% tantalum 2.5% tungsten, electron-beam furnace or vacuum-arc melt, or both, and
1.2.5 R05240 tantalum alloy, 60% tantalum 40% columbium, electron-beam furnace or vacuum-arc melt, or both.
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.
1.4 The following precautionary caveat pertains only to the test methods portion, Section 13, of this specification: This standard does not purport to address all of the safety problems, 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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Designation: B 365 – 98
Standard Specification for
Tantalum and Tantalum Alloy Rod and Wire
This standard is issued under the fixed designation B 365; 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.
1. Scope 3.1.2 rod—material 0.125 to 2.5 in. (3.18 to 63.50 mm) in
diameter in round, hexagonal, or octagonal cross section
1.1 This specification covers unalloyed and alloyed tanta-
supplied in straight lengths.
lum rod and wire.
3.1.3 wire—material 0.010 to 0.124 in. (0.254 to 3.15 mm)
1.2 The materials covered by this specification are:
in diameter furnished in coils or on spools or reels. Material
1.2.1 R05200, unalloyed tantalum, electron-beam furnace
less than 0.010 in. in diameter is not covered by this specifi-
or vacuum-arc melt, or both,
cation.
1.2.2 R05400, unalloyed tantalum, powder-metallurgy con-
solidation,
4. Ordering Information
1.2.3 R05255, tantalum alloy, 90 % tantalum 10 % tungsten,
4.1 Orders for material under this specification shall include
electron-beam furnace or vacuum-arc melt, or both,
the following information as applicable:
1.2.4 R05252, tantalum alloy, 97.5 % tantalum 2.5 % tung-
4.1.1 Quantity (weight or number of pieces),
sten, electron-beam furnace or vacuum-arc melt, or both, and
4.1.2 Name of material (tantalum rod or wire),
1.2.5 R05240 tantalum alloy, 60 % tantalum 40 % colum-
4.1.3 Type (see 1.2),
bium, electron-beam furnace or vacuum-arc melt, or both.
4.1.4 Method of manufacture (Section 5),
1.3 The values stated in inch-pound units are to be regarded
4.1.5 ASTM designation,
as the standard. The values given in parentheses are for
4.1.6 Finish and appearance (Section 9), and
information only.
4.1.7 Additions to the specification and supplementary re-
1.4 The following precautionary caveat pertains only to the
quirements if required.
test methods portion, Section 13, of this specification: This
standard does not purport to address all of the safety problems,
5. Materials and Manufacture
if any, associated with its use. It is the responsibility of the user
5.1 Material covered by this specification shall be made
of this standard to establish appropriate safety and health
from vacuum-arc melted or electron-beam melted ingots or
practices and determine the applicability of regulatory limita-
powder-metallurgy consolidated unalloyed tantalum.
tions prior to use.
5.2 The various tantalum mill products covered by this
2. Referenced Documents specification are formed with the conventional extrusion,
forming, swaging, rolling, and drawing equipment normally
2.1 ASTM Standards:
2 available in metal working plants.
E 8 Test Methods for Tension Testing of Metallic Materials
E 29 Practice for Using Significant Digits in Test Data to
6. Chemical Composition
Determine Conformance with Specifications
6.1 The tantalum and tantalum alloy ingots and the tantalum
powder-metallurgy consolidated ingots for conversion to fin-
3. Terminology
ished products covered by this specification shall conform to
3.1 Definitions of Terms Specific to This Standard:
the requirements for chemical composition as prescribed in
3.1.1 lot—all material produced from the same ingot or a
Table 1.
single powder blend at one time, with the same cross section
6.1.1 Analysis for elements not listed in Table 1 and not
and with the same nominal metallurgical parameters.
normally expected in tantalum shall not be required unless
specified at time of purchase.
This specification is under the jurisdiction of ASTM Committee B-10 on 6.2 The manufacturer’s ingot analysis shall be considered
Reactive and Refractory Metals and Alloys and is the direct responsibility of
the chemical analysis for products supplied under this specifi-
Subcommittee B10.03 on Niobium and Tantalum.
cation.
Current edition approved Apr. 10, 1998. Published October 1998. Originally
published as B 365 – 61 T. Last previous edition B 365 – 92.
Annual Book of ASTM Standards, Vol 03.01.
Annual Book of ASTM Standards, Vol 14.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B 365
TABLE 1 Chemical Requirements
Content, max, weight %
Electron-Beam Electron-Beam Electron-Beam
Electron-Beam
Sintered Cast (R05255) Cast (R05252) Cast (R05240)
Cast (R05200)
Element
(R05400) Vacuum-Arc Cast Vacuum-Arc Cast Vacuum-Arc Cast
Vacuum-Arc Cast
Unalloyed (R05255) 90 % (R05252) 97.5 % (R05240) 60 %
(R05200) Unalloyed
Tantalum Tantalum 10 % Tantalum 2.5 % Tantalum 40 %
Tantalum
Tungsten Tungsten Columbium
C 0.010 0.010 0.010 0.010 0.010
O 0.015 0.03 0.015 0.015 0.020
N 0.010 0.010 0.010 0.010 0.010
H 0.0015 0.0015 0.0015 0.0015 0.0015
Nb 0.10 0.10 0.10 0.50 35.0–42.0
Fe 0.010 0.010 0.010 0.010 0.010
Ti 0.010 0.010 0.010 0.010 0.010
W 0.050 0.050 9.0–11.0 2.0–3.5 0.050
Mo 0.020 0.020 0.020 0.020 0.020
Si 0.005 0.005 0.005 0.005 0.005
Ni 0.010 0.010 0.010 0.010 0.010
Ta remainder remainder remainder remainder remainder
6.3 When requested by the purchaser at the time of pur- may overship by 5 %. The permissible overship for quantities
chase, the seller shall furnish a report certifying the values of larger than this shall be negotiated between the purchaser and
carbon, oxygen, nitrogen, and hydrogen as specified in Table 2 the manufacturer.
for each lot of material supplied. The performance of this
9. Workmanship, Finish, and Appearance
special provision will be negotiated.
9.1 The finished rod and wire shall be free of injurious
7. Mechanical Properties
external and internal imperfections of a nature that will
7.1 Materials supplied under this specification shall con- interfere with the purpose for which it is intended in accor-
form to the requirements for mechanical properties as specified dance with standards of acceptability agreed upon between the
in Table 3. manufacturer and the purchaser.
7.2 The performance of mechanical tests to this requirement 9.2 Material may be finished as forged, rolled, swaged,
will be negotiated at time of purchase. drawn in the as-cleaned, as-machined, or as-ground conditions.
The manufacturer shall be permitted to remove minor surface
8. Dimensions, Mass, and Permissible Variations
imperfections provided such removal does not reduce the
8.1 Tolerances on Rounds—Tolerances on tantalum and dimensions below the minimum permitted by the tolerances
tantalum alloy round products covered by this specification established in Section 8 of this specification.
shall be as specified in Table 4. 9.3 Methods of testing for defects and standards of accept-
8.2 Tolerances for Square, Rectangular, or Other Shapes— ability shall be as agreed upon between the manufacturer and
Tolerances for forged or rolled square, rectangular, or other the purchaser at time of purchase.
shapes shall be as agreed upon between purchaser and seller at
10. Sampling
the time of purchase.
8.3 Other Tolerances and Limitations: 10.1 Samples shall be taken from the material to determine
8.3.1 The permissible variation in cut lengths shall not conformity to this specification. The samples shall be taken so
exceed a total of 0.25 in. (6.35 mm). as to be representative of the finished products.
8.3.2 The permissible variation in straightness of rounds 10.2 Care shall be taken to ensure that the sample selected
shall not exceed 0.050 in. (1.27 mm)/ft (304.8 mm) in any for testing is representative of the material, and that it is not
length. contaminated by the sampling procedure. If there is any
8.4 Quantity or Weight—For orders requiring up to 100 lb question relating to the sampling technique, or to the testing
(45.4 kg), the manufacturer may overship by 10 %. When the thereof, the methods of sampling and testing shall be as agreed
order is for quantities up to 500 lb (226.8 kg), the manufacturer upon between the purchaser and the manufacturer.
TABLE 2 Additional Chemical Requirements for Finished Product (When Specified by the Purchaser)
Content, max, % weight Grades
Electron-Beam Case Electron-Beam Cast Electron-Beam-Cast Electron-Beam Cast
Element (R05200) Vacuum- Sintered (R05400) (R05255) Vacuum- (R0
...
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