ASTM B521-98

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: B 521 – 98
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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4.1.1 Quantity,
4.1.2 UNS grade,
1.1 This specification covers tantalum and tantalum alloy
4.1.3 Type (welded or seamless),
seamless and welded tubes of the following grades:
4.1.4 Dimensions,
1.1.1 UNS Grade R05400—Unalloyed tantalum, powder-
4.1.5 Nondestructive test requirements, if any, and
metallurgy consolidation,
4.1.6 Additions to the specification and supplementary re-
1.1.2 UNS Grade R05200—Unalloyed tantalum, vacuum
quirements, if any.
melted,
1.1.3 UNS Grade R05252—Tantalum+2.5% tungsten al-
5. Materials and Manufacture
loy, vacuum melted.
5.1 Seamless tube shall be made by any seamless method
1.1.4 UNS Grade R05255—Tantalum+10% tungsten al-
that will yield a product meeting the requirements of this
loy, vacuum melted.
specification.
1.1.5 UNS Grade R05240—Tantalum alloy, 60% tantalum,
5.2 Welded tube shall be made from flat-rolled product by
40% columbium, electron-beam furnace or vacuum arc melt,
an automatic or semiautomatic fusion welding process with no
or both.
addition of filler metal.
1.2 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are for
6. Chemical Composition
information only.
6.1 The material shall conform to the requirements of
2. Referenced Documents chemical composition prescribed in Table 1.
6.1.1 Analysis for elements not listed in Table 1 and not
2.1 ASTM Standards:
normally expected in tantalum shall not be required unless
E29 Practice for Using Significant Digits in Test Data to
2 specified at time of purchase.
Determine Conformance with Specifications
6.2 The manufacturer’s ingot analysis shall be considered
3. Terminology the chemical analysis for products supplied under this specifi-
cation.
3.1 Definitions of Terms Specific to This Standard:
6.3 Whenrequestedbythepurchaseratthetimeofpurchase
3.1.1 lot—all material produced from the same ingot or
the manufacturer shall report the values of the interstitial
single powder blend, of the same size and last annealed in the
elements carbon, oxygen, hydrogen, and nitrogen as specified
same furnace charge.
in Table 2 for each lot of finished product.
3.1.2 process length—theone-piecelengthofeachtubethat
results from the production operation that first yields the
7. Mechanical Properties
tubular form. Sampling and testing should in general be based
7.1 Tensile—The tensile properties of the finished tube
on process lengths unless specifically stated otherwise.
material shall conform to the requirements of Table 3.
4. Ordering Information 7.2 Flare—Asectionofthefinishedtubeshallbecapableof
being flared without cracking visibly to the unaided eye. The
4.1 Ordersformaterialunderthisspecificationshallinclude
flareshallbemadewithatoolhavinga60°includedangleuntil
the following information:
the outside diameter has been increased 20%.
7.3 Reverse Flattening—Asectionofweldedtubethatisslit
This specification is under the jurisdiction of ASTM Committee B-10 on
longitudinally 90° either side of the weld shall be opened and
Reactive and Refractory Metals and Alloysand is the direct responsibility of
flattened with the weld at the point of maximum bend. No
Subcommittee B10.03on Niobium and Tantalum.
cracking is permitted.
Current edition approved Apr. 10, 1998. Published September 1998. Originally
published as B521–70. Last previous edition B521–92.
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.
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.
B 521
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
(0.7 MPa), minimum for 5 s, minimum without showing
on Individual Measurements
evidence of leakage. The test method used shall permit easy
Diameter Permissible
visual detection of any leakage such as by placing the tube
A,B C
Outside Diameter, Tolerance, Variations
under water or by using the pressure differential method. Any
in. (mm) Plus or Minus, in Wall
in. (mm) Thickness, % evidence of the leakage shall be cause of rejection of that tube.
8.3 Helium Leak Test—If specified in the purchase order,
Under 1 (25.4), excl 0.004 (0.102) 10
1to1 ⁄2 (25.4 to 38.1), excl 0.005 (0.127) 10
each tube shall be tested by evacuating to an internal pressure
1 ⁄2 to 2 (38.1 to 50.8), excl 0.006 (0.152) 10 −6
of 10 310 torr (1.3 MPa) or less and tested for leakage by
2to2 ⁄2 (50.8 to 63.5), excl 0.007 (0.178) 10
1 1
spraying helium along the length of the outside surface.
2 ⁄2 000to 3 ⁄2 (63.5 to 88.9), excl 0.010 (0.254) 10
−7
A Detection of a leak at a rate greater than 10 310 standard
These permissible variations in outside diameter apply only to tubes as finished
at the mill before subsequent swaging, expanding, bending, polishing, or other
cm /s shall be cause of rejection of that tube.
fabricating operation.
8.4 Ultrasonic Test—If specified on the purchase order,
B
Ovality is the maximum and minimum outside diameter of a tube measured at
each length of tube shall be tested ultrasonically. The test
any one cross section. If the measurement is made with a ring gage the following
formula shall apply: Ovality 5 specified OD tube + diameter tolerance + 0.002 in.
procedure and calibration standards shall be agreed upon
(length of ring gage, 1 in.) 3 nominal diameter.
between the manufacturer and purchaser.Any tube showing an
C
When minimum wall tubes are ordered, tolerances are all plus and shall be
double the values shown. indication in excess of that obtained from the calibration
standard shall be set aside and be subject to rework, retest, or
7.4 One set of
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