ASTM B521-98(2004)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:B521 −98(Reapproved2004)
Standard Specification for
Tantalum and Tantalum Alloy Seamless and Welded Tubes
This standard is issued under the fixed designation B521; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Ordering Information
1.1 This specification covers tantalum and tantalum alloy 4.1 Ordersformaterialunderthisspecificationshallinclude
seamless and welded tubes of the following grades: the following information:
4.1.1 Quantity,
1.1.1 UNS Grade R05400—Unalloyed tantalum, powder-
metallurgy consolidation, 4.1.2 UNS grade,
4.1.3 Type (welded or seamless),
1.1.2 UNS Grade R05200—Unalloyed tantalum, vacuum
melted, 4.1.4 Dimensions,
4.1.5 Nondestructive test requirements, if any, and
1.1.3 UNS Grade R05252—Tantalum + 2.5 % tungsten
alloy, vacuum melted. 4.1.6 Additions to the specification and supplementary
requirements, if any.
1.1.4 UNS Grade R05255—Tantalum + 10 % tungsten
alloy, vacuum melted.
5. Materials and Manufacture
1.1.5 UNS Grade R05240—Tantalum alloy, 60% tantalum,
40% columbium, electron-beam furnace or vacuum arc melt, 5.1 Seamless tube shall be made by any seamless method
or both. that will yield a product meeting the requirements of this
specification.
1.2 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are for 5.2 Welded tube shall be made from flat-rolled product by
information only. an automatic or semiautomatic fusion welding process with no
addition of filler metal.
2. Referenced Documents
6. Chemical Composition
2.1 ASTM Standards:
6.1 The material shall conform to the requirements of
E29Practice for Using Significant Digits in Test Data to
chemical composition prescribed in Table 1.
Determine Conformance with Specifications
6.1.1 Analysis for elements not listed in Table 1 and not
normally expected in tantalum shall not be required unless
3. Terminology
specified at time of purchase.
3.1 Definitions of Terms Specific to This Standard:
6.2 The manufacturer’s ingot analysis shall be considered
3.1.1 lot—all material produced from the same ingot or
the chemical analysis for products supplied under this specifi-
single powder blend, of the same size and last annealed in the
cation.
same furnace charge.
6.3 Whenrequestedbythepurchaseratthetimeofpurchase
3.1.2 process length—the one-piece length of each tube that
the manufacturer shall report the values of the interstitial
results from the production operation that first yields the
elements carbon, oxygen, hydrogen, and nitrogen as specified
tubular form. Sampling and testing should in general be based
in Table 2 for each lot of finished product.
on process lengths unless specifically stated otherwise.
7. Mechanical Properties
7.1 Tensile—The tensile properties of the finished tube
This specification is under the jurisdiction of ASTM Committee B10 on
material shall conform to the requirements of Table 3.
Reactive and Refractory Metals and Alloysand is the direct responsibility of
Subcommittee B10.03 on Niobium and Tantalum.
7.2 Flare—Asectionofthefinishedtubeshallbecapableof
Current edition approved May 1, 2004. Published May 2004. Originally
being flared without cracking visibly to the unaided eye. The
approved in 1970. Last previous edition approved in 1998 as B521–98. DOI:
flareshallbemadewithatoolhavinga60°includedangleuntil
10.1520/B0521-98R04.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or the outside diameter has been increased 20%.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
7.3 Reverse Flattening—Asectionofweldedtubethatisslit
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. longitudinally 90° either side of the weld shall be opened and
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B521−98(2004)
TABLE 1 Ingot Chemical Requirements
(Composition, max weight %)
Element
R05200 R05400 R05252 R05255 R05240
O 0.015 0.030 0.015 0.015 0.020
N 0.010 0.010 0.010 0.010 0.010
C 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 0.50 0.10 35.0–42.0
Mo 0.020 0.020 0.020 0.020 0.020
W 0.050 0.050 2.0–3.5 9.0–11.0 0.050
Ti 0.010 0.010 0.010 0.010 0.010
Si 0.005 0.005 0.005 0.005 0.005
Fe 0.010 0.010 0.010 0.010 0.010
Ni 0.010 0.010 0.010 0.010 0.010
Ta remainder remainder remainder remainder remainder
TABLE 2 Mechanical Requirements
R05200/R05400 R05252 R05255 R05240
Ultimate tensile strength, min, psi (MPa) 30 000 (207) 40 000 (276) 70 000 (481) 40 000 (226)
Yield strength, 0.2 % offset, min, psi (MPa) 20 000 (138) 28 000 (193) 60 000 (414) 28 000 (193)
Elongation, min %, in 1 or 2 in. (25 or 51 mm) 25 20 15 20
TABLE 3 Permissible Variations in Outside Dimensions Based on
t = average wall thickness of the tube, in. (or mm), and
Individual Measurements
D = outside diameter of the tube in. (or mm).
Diameter Permissible
A,B C Maintain the test pressure for a minimum of 10 s.
Outside Diameter,
Tolerance, Variations
in. (mm) Plus or Minus, in Wall
8.2 Pneumatic Test—If specified in the purchase order, each
in. (mm) Thickness, %
tubesotestedshallwithstandaninternalairpressureof100psi
Under 1 (25.4), excl 0.004 (0.102) 10
1to1 ⁄2 (25.4 to 38.1), excl 0.005 (0.127) 10
(0.7 MPa), minimum for 5 s, minimum without showing
1 ⁄2 to 2 (38.1 to 50.8), excl 0.006 (0.152) 10
evidence of leakage. The test method used shall permit easy
2to2 ⁄2 (50.8 to 63.5), excl 0.007 (0.178) 10
1 1
visual detection of any leakage such as by placing the tube
2 ⁄2 to 3 ⁄2 (63.5 to 88.9), excl 0.010 (0.254) 10
A under water or by using the pressure differential method. Any
These permissible variations in outside diameter apply only to tubes as finished
at the mill before subsequent swaging, expanding, bending, polishing, or other
evidence of the leakage shall be cause of rejection of that tube.
fabricating operation.
B 8.3 Helium Leak Test—If specified in the purchase order,
Ovality is the maximum and minimum outside diameter of a tube measured at any
one cross section. If the measurement is made with a ring gage the following
each tube shall be tested by evacuating to an internal pressure
formula shall apply: Ovality = specified OD tube + diameter tolerance + 0.002 in. −6
of 10×10 torr (1.3 MPa) or less and tested for leakage by
(length of ring gage, 1 in.) × nominal diameter.
C
spraying helium along the length of the outside surface.
When minimum wall tubes are ordered, tolerances are all plus and shall be
−7
double the values shown.
Detection of a leak at a rate greater than 10×10 standard
cm /s shall be cause of rejection of that tube.
8.4 Ultrasonic Test—Ifspecifiedonthepurchaseorder,each
length of tube shall be tested ultrasonically.The test procedure
flattened with the weld at the point of maximum bend. No
and calibration standards shall be agreed upon between the
cracking is permitted.
manufacturerandpurchaser.Anytubeshowinganindicationin
7.4 One set of these mechan
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