ASTM B655/B655M-96(1999)
(Specification)Standard Specification for Niobium-Hafnium Alloy Bar, Rod, and Wire
Standard Specification for Niobium-Hafnium Alloy Bar, Rod, and Wire
SCOPE
1.1 This specification covers hafnium alloyed niobium bar, rod, and wire.
1.2 The material covered by this specification is R04295, niobium-base alloy containing approximately 10% hafnium and 1% titanium.
1.3 The values stated in either inch-pound units or SI units are to be regarded separately as the standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
1.4 The following safety hazards caveat pertains only to the test methods portion, Section 14, of this specification: This standard does not purport to address all of the safety concerns, 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 655/B 655M – 96 (Reapproved 1999)
Standard Specification for
Niobium-Hafnium Alloy Bar, Rod, and Wire
This standard is issued under the fixed designation B 655/B 655M; 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 ⁄2 in. [3.21 to 64 mm] in
diameter in round, hexagonal, or octagonal cross section
1.1 This specification covers hafnium alloyed niobium bar,
supplied in straight lengths.
rod, and wire.
3.1.3 wire—material 0.020 to 0.124 in. [0.50 to 3.20 mm] in
1.2 The material covered by this specification is R04295,
diameter furnished in coils, spools, or on reels. Material less
niobium-base alloy containing approximately 10 % hafnium
than 0.020 in. [0.50 mm] in diameter is not covered in this
and 1 % titanium.
specification.
1.3 The values stated in either inch-pound units or SI units
are to be regarded separately as standard. Within the text, the
4. Ordering Information
SI units are shown in brackets. The values stated in each
4.1 Orders for material under this specification should
system are not exact equivalents; therefore, each system shall
include the following information as applicable:
be used independently of the other. Combining values from the
4.1.1 General alloy description (see 1.2),
two systems may result in nonconformance with the specifi-
4.1.2 Quantity in weight or pieces,
cation.
4.1.3 Size, diameter, and length,
1.4 The following safety hazards caveat pertains only to the
4.1.4 Method of manufacture (Section 5),
test methods portion, Section 14, of this specification: This
4.1.5 Chemistry (Section 6),
standard does not purport to address all of the safety concerns,
4.1.6 Temper (Section 7),
if any, associated with its use. It is the responsibility of the user
4.1.7 Quality and finish (Section 10),
of this standard to establish appropriate safety and health
4.1.8 Sampling (Section 13),
practices and determine the applicability of regulatory limita-
4.1.9 Marking (Section 19),
tions prior to use.
4.1.10 Packaging (Section 20),
2. Referenced Documents 4.1.11 Required Reports (Section 18), and
4.1.12 Disposition of rejected material (Section 16).
2.1 ASTM Standards:
B 652 Specification for Niobium-Hafnium Alloy Ingots
5. Materials and Manufacture
E 8 Test Methods for Tension Testing of Metallic Materials
5.1 Materials covered by this specification shall be made
E 21 Test Methods for Elevated Temperature Tension Tests
3 from ingots in accordance with Specification B 652.
of Metallic Materials
5.2 The various niobium-hafnium alloy products covered by
E 29 Practice for Using Significant Digits in Test Data to
4 this specification are formed with the conventional extrusion,
Determine Conformance with Specifications
forging, swaging, rolling, and drawing equipment normally
3. Terminology available in metal working plants.
3.1 Definitions:
6. Chemical Composition
3.1.1 bar—material less than 6 in. [150 mm] in width and
6.1 The niobium-hafnium alloy ingots and billets for con-
0.187 in. [4.75 mm] or greater in thickness, with a rectangular
version to finished products covered by this specification shall
or square cross section, supplied in straight lengths.
conform to the requirements as to chemical composition
prescribed in Table 1. Analysis for elements, not listed in Table
This specification is under the jurisdiction of ASTM Committee B-10 on 1 and not normally expected in niobium-hafnium alloy, shall
Reactive and Refractory Metals and Alloysand is the direct responsibility of
not be required unless specified at time of purchase.
Subcommittee B10.03on Niobium and Tantalum.
6.2 The manufacturer’s ingot analysis shall be considered
Current edition approved Dec. 10, 1996. Published January 1997. Originally
the chemical analysis for products supplied under this specifi-
published as B 655 – 79. Last previous edition B 655 – 92.
Annual Book of ASTM Standards, Vol 02.04.
cation.
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 655/B 655M
TABLE 1 Chemical Requirements (Ingot)
9. Permissible Variations
Niobium-Hafnium Alloy Grade R04295
9.1 Tolerances on Rounds—Tolerances on niobium-
Content, Maximum
hafnium alloy round products covered by this specification
Element Weight %, (Except Where
shall be as prescribed in Table 4.
Otherwise Specified)
9.2 Tolerances for Square, Rectangular, or Other Shapes—
Carbon 0.015
Oxygen 0.025
Tolerances for forged or rolled square, rectangular, or other
Nitrogen 0.010
shapes shall be as agreed upon between the purchaser and
Hydrogen 0.0015
manufacturer at the time of purchase.
Hafnium 9–11
Titanium 0.7–1.3
9.3 Other Tolerances and Limitations:
Zirconium 0.700
9.3.1 The permissible variation in cut lengths shall not
Tungsten 0.500
Tantalum 0.500
exceed a total of ⁄4 in. [6.5 mm].
Niobium by difference
9.3.2 The permissible variation in straightness of rounds
shall not exceed 0.050 in. [1.26 mm] per foot [300 mm] in any
length.
9.4 Quantity or Weight—For orders up to 100 ft [30 m] the
6.3 Upon request of the purchaser at the time of purchase,
manufacturer may overship up to 20 %. For orders up to 1000
the manufacturer shall furnish a report certifying the values of
lb [450 kg] or 1000 ft [300 m], the manufacturer may overship
the interstitial elements, (C, O, N, H) as specified in Table 2 for
up to 10 %. The permissible overshipment for orders larger
each lot of material supplied. A lot is defined as that material
than this quantity shall be negotiated at the time of purchase.
produced from one ingot and heat treated at the same time.
6.4 In the event of dispute over conformity of the material to
10. Quality and Finish
this specification, upon agreement between the purchaser and
the seller as to procedure, representative samples of the
10.1 Niobium-hafnium alloy bar, rod, and wire shall be free
material may be submitted to a referee for analysis.
of injurious external and internal imperfections of a nature that
will interfere with the purpose for which it is intended.
7. Temper Designations
Material may be finished as forged, rolled, swaged, drawn; in
a cleaned, machined, or ground condition. The manufacturer
7.1 Unless otherwise stated, the materials supplied under
shall be permitted to remove minor surface imperfections
this specification shall be in the annealed condition, defined as
provided such removal does not reduce the dimensions below
at least 90 % recrystallized.
the minimum permitted by the tolerances in accordance with
7.2 Other temper designations, such as cold-worked temper
Section 9.
or a stress-relieved temper can be specified as agreed upon
between purchaser and the manufacturer at the time of pur-
10.2 Test methods for these defects and standards of accept-
chase. ability shall be as agreed upon between the purchaser and the
manufacturer at the time of purchase.
8. Mechanical Requirements
11. Retests
8.1 Materials in the annealed condition supplied under this
specification shall conform to the requirements for mechanical
11.1 If any sample or specimen exhibits obvious surface
properties as prescribed in Table 3.
contamination or improper preparation disqualifying it as a
8.2 The materials shall conform to the requirements for
truly representative sample, it shall be discarded and a new
room temperature mechanical properties prescribed in Table 3
sample or specimen substituted.
when tested within a room temperature range from 65 to 85°F
11.2 In case of a failure, two additional specimens shall be
[18 to 30°C].
retested. If both retest specimens conform to this specification,
8.3 Elevated Temperature Mechanical Properties—The
the original values shall be discarded and the material ac-
purchaser may specify elevated temperature mechanical prop-
cepted.
ert
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