ASTM B655/B655M-04

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Designation: B655/B655M – 04
Standard Specification for
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Niobium-Hafnium Alloy Bar, Rod, and Wire
This standard is issued under the fixed designation B655/B655M; 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 3.1.1 bar, n—material less than 6 in. [150 mm] in width and
0.187in.[4.8mm]orgreaterinthickness,witharectangularor
1.1 This specification covers hafnium alloyed niobium bar,
square cross section, supplied in straight lengths.
rod, and wire.
3.1.2 lot, n—a lot is defined as that material produced from
1.2 The material covered by this specification is R04295,
one ingot and heat treated at the same conditions.
niobium-base alloy containing approximately 10 % hafnium
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3.1.3 rod, n—material 0.125 to 2 ⁄2 in. [3.2 to 64 mm] in
and 1 % titanium.
diameter in round, hexagonal, or octagonal cross section
1.3 The values stated in either inch-pound units or SI units
supplied in straight lengths.
are to be regarded separately as standard. Within the text, the
3.1.4 wire, n—material 0.020 to 0.124 in. [0.50 to 3.2 mm]
SI units are shown in brackets. The values stated in each
in diameter furnished in coils, spools, or on reels. Material less
system are not exact equivalents; therefore, each system shall
than 0.020 in. [0.50 mm] in diameter is not covered in this
be used independently of the other. Combining values from the
specification.
two systems may result in nonconformance with the specifi-
cation.
4. Ordering Information
1.4 The following safety hazards caveat pertains only to the
4.1 Orders for material under this specification should
test methods portion, Section 14, of this specification: This
include the following information as applicable:
standard does not purport to address all of the safety concerns,
4.1.1 General alloy description (see 1.2) and ASTM desig-
if any, associated with its use. It is the responsibility of the user
nation and year of issue,
of this standard to establish appropriate safety and health
4.1.2 Quantity in weight or pieces,
practices and determine the applicability of regulatory limita-
4.1.3 Size, diameter, and length,
tions prior to use.
4.1.4 Chemical Composition (Section 6),
2. Referenced Documents 4.1.5 Temper (Section 7),
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4.1.6 Mechanical test temperature and limits (Sections 8
2.1 ASTM Standards:
and 14),
B652/B652M Specification for Niobium-HafniumAlloy In-
4.1.7 Permissible dimensional tolerances and weight or
gots
quantity variations (see 9.2 and 9.4),
E8 Test Methods for Tension Testing of Metallic Materials
4.1.8 Quality and finish (see 10.2),
E21 Test Methods for Elevated Temperature Tension Tests
4.1.9 Sampling (see 13.2),
of Metallic Materials
4.1.10 Inspection witnessing (see 15.2),
E29 Practice for Using Significant Digits in Test Data to
4.1.11 Certification requirements (Section 18), and
Determine Conformance with Specifications
4.1.12 Packaging (Section 20),
3. Terminology
5. Materials and Manufacture
3.1 Definitions:
5.1 Materials covered by this specification shall be made
from ingots in accordance with Specification B652/B652M.
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This specification is under the jurisdiction of ASTM Committee B10 on
5.2 Thevariousniobium-hafniumalloyproductscoveredby
Reactive and Refractory Metals and Alloys and is the direct responsibility of
this specification are formed with the conventional extrusion,
Subcommittee B10.03 on Niobium and Tantalum.
forging, swaging, rolling, and drawing equipment normally
Current edition approved May 1, 2004. Published May 2004. Originally
approved in 1979. Last previous edition approved in 1996 as B655/
available in metal working plants.
B655M – 96 (1999). DOI: 10.1520/B0655_B0655M-04.
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contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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B655/B655M – 04
TABLE 2 Additional Chemical Requirements for Finished
6. Chemical Composition
Product (When Specified by Purchaser)
6.1 The chemical composition of niobium-hafnium alloy
Niobium-Hafnium Alloy Grade R04295
ingots and billets for conversion to finished products covered
Content, Maximum
by this specification shall conform to the requirements pre-
Element
Weight %
scribed in Table 1. Analysis for elements, not listed in Table 1
Oxygen 0.035
and not normally expected in niobium-hafnium alloy, shall not
Carbon 0.015
be required unle
...