ASTM B365-12(2019)

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:B365 −12 (Reapproved 2019)
Standard Specification for
Tantalum and Tantalum Alloy Rod and Wire
This standard is issued under the fixed designation B365; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
2.1 ASTM Standards:
1.1 This specification covers unalloyed and alloyed tanta-
lum rod and wire. E8 Test Methods for Tension Testing of Metallic Materials
[Metric] E0008_E0008M
1.2 The materials covered by this specification are:
E29 Practice for Using Significant Digits in Test Data to
1.2.1 R05200, unalloyed tantalum, electron-beam furnace
Determine Conformance with Specifications
or vacuum-arc melt, or both,
1.2.2 R05400, unalloyed tantalum, powder-metallurgy
3. Terminology
consolidation,
3.1 Definitions of Terms Specific to This Standard:
1.2.3 R05255, tantalum alloy, 90 % tantalum, 10 %
3.1.1 lot, n—all material produced from the same ingot or a
tungsten, electron-beam furnace or vacuum-arc melt, or both,
single powder blend at one time, with the same cross section
1.2.4 R05252, tantalum alloy, 97.5 % tantalum, 2.5 %
and with the same nominal metallurgical parameters.
tungsten, electron-beam furnace or vacuum-arc melt, or both,
3.1.2 rod, n—material 0.125 to 2.5 in. (3.18 to 63.50 mm) in
and
diameter in round, hexagonal, or octagonal cross section
1.2.5 R05240 tantalum alloy, 60 % tantalum, 40 % niobium,
supplied in straight lengths.
electron-beam furnace or vacuum-arc melt, or both.
3.1.3 wire, n—material 0.010 to 0.124 in. (0.254 to 3.15
1.3 The values stated in inch-pound units are to be regarded
mm) in diameter furnished in coils or on spools or reels.
as standard. The values given in parentheses are mathematical
Material less than 0.010 in. in diameter is not covered by this
conversions to SI units that are provided for information only
specification.
and are not considered standard.
4. Ordering Information
1.4 The following precautionary caveat pertains only to the
test methods portion, Section 13, of this specification: This 4.1 Orders for material under this specification shall include
standard does not purport to address all of the safety problems,
the following information as applicable:
if any, associated with its use. It is the responsibility of the user 4.1.1 Quantity (weight or number of pieces),
of this standard to establish appropriate safety, health, and
4.1.2 Name of material (tantalum rod or wire),
environmental practices and determine the applicability of 4.1.3 Type (see 1.2),
regulatory limitations prior to use.
4.1.4 Method of manufacture (Section 5),
1.5 This international standard was developed in accor- 4.1.5 ASTM designation,
dance with internationally recognized principles on standard-
4.1.6 Finish and appearance (Section 9), and
ization established in the Decision on Principles for the 4.1.7 Additions to the specification and supplementary re-
Development of International Standards, Guides and Recom-
quirements if required.
mendations issued by the World Trade Organization Technical
5. Materials and Manufacture
Barriers to Trade (TBT) Committee.
5.1 Material covered by this specification shall be made
from vacuum-arc melted or electron-beam melted ingots or
powder-metallurgy consolidated unalloyed tantalum.
This specification is under the jurisdiction of ASTM Committee B10 on
Reactive and Refractory Metals and Alloys and is the direct responsibility of
Subcommittee B10.03 on Niobium and Tantalum. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Nov. 1, 2019. Published November 2019. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1961. Last previous edition approved in 2012 as B365 – 12. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/B0365-12R19. the ASTM website.
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B365−12 (2019)
5.2 The various tantalum mill products covered by this 8.3.1 The permissible variation in cut lengths shall not
specification are formed with the conventional extrusion, exceed a total of 0.25 in. (6.35 mm).
forming, swaging, rolling, and drawing equipment normally
8.3.2 The permissible variation in straightness of rounds
available in metal working plants.
shall not exceed 0.050 in. (1.27 mm)/ft (304.8 mm) in any
length.
6. Chemical Composition
8.4 Quantity or Weight—For orders requiring up to 100 lb
6.1 The tantalum and tantalum alloy ingots and the tantalum
(45.4 kg), the manufacturer may overship by 10 %. When the
powder-metallurgy consolidated ingots for conversion to fin-
order is for quantities up to 500 lb (226.8 kg), the manufacturer
ished products covered by this specification shall conform to
may overship by 5 %. The permissible overship for quantities
the requirements for chemical composition as prescribed in
larger than this shall be negotiated between the purchaser and
Table 1.
the manufacturer.
6.1.1 Analysis for elements not listed in Table 1 and not
normally expected in tantalum shall not be required unless
9. Workmanship, Finish, and Appearance
specified at time of purchase.
9.1 The finished rod and wire shall be free of injurious
6.2 The manufacturer’s ingot analysis shall be considered
external and internal imperfections of a nature that will
the chemical analysis for products supplied under this specifi-
interfere with the purpose for which it is intended in accor-
cation.
dance with standards of acceptability agreed upon between the
6.3 When requested by the purchaser at the time of
manufacturer and the purchaser.
purchase, the seller shall furnish a report certifying the values
9.2 Material may be finished as forged, rolled, swaged,
ofcarbon,oxygen,nitrogen,andhydrogenasspecifiedinTable
drawn in the as-cleaned, as-machined, or as-ground conditions.
2 for each lot of material supplied. The performance of this
The manufacturer shall be permitted to remove minor surface
special provision will be negotiated.
imperfections provided such removal does not reduce the
7. Mechanical Properties dimensions below the minimum permitted by the tolerances
established in Section 8 of this specification.
7.1 Materials supplied under this specification shall con-
form to the requirements for mechanical properties as specified
9.3 Methods of testing for defects and standards of accept-
in Table 3.
ability shall be as agreed upon between the manufacturer and
the purchaser at time of purchase.
7.2 The performance of mechanical tests to this requirement
will be negotiated at time of purchase.
10. Sampling
8. Dimensions, Mass, and Permissible Variations
10.1 Samples shall be taken from the material to determine
8.1 Tolerances on Rounds—Tolerances on tantalum and
conformity to this specification. The samples shall be taken so
tantalum alloy round products covered by this specification
as to be representative of the finished products.
shall be as specified in Table 4.
10.2 Care shall be taken to ensure that the sample selected
8.2 Tolerances for Square, Rectangular, or Other Shapes—
for testing is representative of the material, and that it is not
Tolerances for forged or rolled square, rectangular, or other
contaminated by the sampling procedure. If there is any
shapes shall be as agreed upon between purchaser and seller at
question relating to the sampling technique, or to the testing
the time of purchase.
thereof, the methods of sampling and testing shall be as agreed
8.3 Other Tolerances and Limitations: upon between the purchaser and the manufacturer.
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 Niobium
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
B365−12 (2019)
TABLE 2 Additional Chemical Requirements for Finished Product (When Specified
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