ASTM B392-99
(Specification)Standard Specification for Niobium and Niobium Alloy Bar, Rod, and Wire
Standard Specification for Niobium and Niobium Alloy Bar, Rod, and Wire
SCOPE
1.1 This specification covers four grades of wrought niobium and niobium alloy bar, rod, and wire as follows: Note-Committee B-10 has adopted "niobium" as the designation for Element No. 41, formerly named "columbium."
1.1.1 R04200-Type 1 -Reactor grade unalloyed niobium,
1.1.2 R04210-Type 2 -Commercial grade unalloyed niobium,
1.1.3 R04251-Type 3 -Reactor grade niobium alloy containing 1% zirconium, and
1.1.4 R04261-Type 4 -Commercial grade niobium alloy containing 1% zirconium.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 The following precautionary caveat pertains only to the test methods portion 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 392 – 99
Standard Specification for
Niobium and Niobium Alloy Bar, Rod, and Wire
This standard is issued under the fixed designation B 392; 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 heat treated at the same conditions.
3.1.2 bar—material less than 6 in. (152.4 mm) in width and
1.1 This specification covers four grades of wrought nio-
0.187 in. (4.75 mm) or greater in thickness, with a rectangular
bium and niobium alloy bar, rod, and wire as follows:
cross section, supplied in straight lengths.
NOTE 1—Committee B-10 has adopted “niobium” as the designation
3.1.3 rod—material 0.125 to 2.50 in. (3.18 to 63.50 mm) in
for Element No. 41, formerly named “columbium.”
diameter, in round, hexagonal, or octagonal cross section
1.1.1 R04200-Type 1—Reactor grade unalloyed niobium,
supplied in straight lengths.
1.1.2 R04210-Type 2—Commercial grade unalloyed nio-
3.1.4 wire—material 0.020 to 0.124 in. (0.51 to 3.15 mm) in
bium,
diameter, furnished in coils or on spools or reels. Material less
1.1.3 R04251-Type 3—Reactor grade niobium alloy con-
than 0.020 in. (0.51 mm) in diameter is not covered by this
taining 1 % zirconium, and
specification.
1.1.4 R04261-Type 4—Commercial grade niobium alloy
4. Ordering Information
containing 1 % zirconium.
1.2 The values stated in inch-pound units are to be regarded
4.1 Orders for materials under this specification shall in-
as the standard. The values given in parentheses are for
clude the following information as applicable:
information only.
4.1.1 Type and grade (Section 1),
1.3 The following precautionary caveat pertains only to the
4.1.2 ASTM designation and year of issue,
test methods portion of this specification. This standard does
4.1.3 Method of manufacture (Section 5),
not purport to address all of the safety concerns, if any,
4.1.4 Temper designation (Section 8),
associated with its use. It is the responsibility of the user of this
4.1.5 Quantity in weight, number of pieces, and dimensions,
standard to establish appropriate safety and health practices
4.1.6 Chemistry (Section 6),
and determine the applicability of regulatory limitations prior
4.1.7 Mechanical properties (Section 7),
to use.
4.1.8 Quality and finish (Section 10),
4.1.9 Sampling (Section 11),
2. Referenced Documents
4.1.10 Marking (Section 18),
2.1 ASTM Standards:
4.1.11 Packaging (Section 19),
B 391 Specification for Niobium and Niobium Alloy In-
4.1.12 Required reports (Section 17),
gots
4.1.13 Disposition of rejected material (Section 16), and
E 8 Test Methods for Tension Testing of Metallic Materials
4.1.14 Additions to the specification and supplementary
E 29 Practice for Using Significant Digits in Test Data to
requirements, as required.
Determine Conformance with Specifications
5. Materials and Manufacture
3. Terminology
5.1 Material covered by this specification shall be made
3.1 Definitions of Terms Specific to This Standard: Descrip-
from ingots that conform to Specification B 391 and that are
tions of Terms Specific to This Standard:
produced by vacuum or plasma arc melting, vacuum electron-
3.1.1 lot—a lot shall consist of all material produced from
beam melting, or a combination of these three methods.
the same ingot at one time, with the same cross section,
5.2 The various niobium mill products covered by this
processed with the same nominal metallurgical parameters and
specification are formed with the conventional extrusion,
forging, swaging, rolling, and drawing equipment normally
available in metal working plants.
This specification is under the jurisdiction of ASTM Committee B-10 on
Reactive and Refractory Metals and Alloysand is the direct responsibility of
6. Chemical Requirements
Subcommittee B10.03on Niobium and Tantalum.
Current edition approved Dec. 10, 1999. Published January 2000. Originally
6.1 The niobium and niobium alloy ingots and billets for
published as B 392-89. Last previous edition B 392-95.
conversion to finished products covered by this specification
Annual Book of ASTM Standards, Vol 02.04.
shall conform to the requirements for chemical composition
Annual Book of ASTM Standards, Vol 03.01.
Annual Book of ASTM Standards, Vol 14.02. and hardness as prescribed in Table 1 and Table 2.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
B 392
TABLE 1 Chemical Requirements TABLE 4 Mechanical Properties, Annealed Condition (90 %
Minimum Recrystallized)
Type 1 Type 2 Type 3 Type 4
(Reactor (Commercial (Reactor (Commercial
Ultimate Tensile Elongation
Yield Strength, psi
Grade Grade Grade Grade
Grade Strength, Min, psi min %,
(MPa)
A
Element Unalloyed Unalloyed Niobium— Niobium—1
(MPa) mm
Niobium) Niobium) 1% %
Rod, 0.125 in. (3.18 mm) to 2.5 in. (63.5 mm) diameter
R04200 R04210 Zirconium) Zirconium)
Types 1 and 2 18 000 (125) 10 500 (73) 25
R04251 R04261
Types 3 and 4 28 000 (195) 18 000 (125) 20
Wire, 0.020 in. (0.508 mm) to 0.124 in. (3.14 mm)
Max Weight % (Except Where Otherwise Specified)
Types 1 and 2 18 000 (125) . 20
Each Ingot:
Types 3 and 4 28 000 (195) . 15
Carbon 0.01 0.01 0.01 0.01
A
10 in. (254 mm) gage length to 0.050 in. (1.27 mm) diameter, and 1 in. (25.4
Nitrogen 0.01 0.01 0.01 0.01
mm) or 2 in. (50.8 mm) gage length over 0.050 in. (1.27 mm).
Oxygen 0.015 0.025 0.015 0.025
Hydrogen 0.0015 0.0015 0.0015 0.0015
Zirconium 0.02 0.02 0.8 to 1.2 0.8 to 1.2
(range) (range)
these specifications shall be in the fully annealed condition,
Tantalum 0.1 0.3 0.1 0.5
that is, at least 90 % recrystallized.
Iron 0.005 0.01 0.005 0.01
8.2 Other temper designations, such as cold-worked temper
Silicon 0.005 0.005 0.005 0.005
Tungsten 0.03 0.05 0.03 0.05
or stress-relieved temper, can be specified as agreed upon
Nickel 0.005 0.005 0.005 0.005
between the purchaser and the manufacturer at the time of
Molybdenum 0.010 0.020 0.010 0.050
purchase.
Hafnium 0.02 0.02 0.02 0.02
Titanium 0.02 0.03 0.02 0.03
When Specified:
9. Permissible Variations in Dimensions and Weight
Boron 2 ppm . 2 ppm .
Aluminum 0.002 0.005 0.002 0.005 9.1 Tolerances on Rounds—Tolerances on niobium and
Beryllium 0.005 . 0.005 .
niobium alloy round products covered by this specification
Chromium 0.002 . 0.002 .
shall be as prescribed in Table 5.
Cobalt 0.002 . 0.002 .
9.2 Tolerances for Square, Rectangular, or Other Shapes—
Tolerances for forged or rolled square, rectangular, or other
TABLE 2 Brinell Hardness shapes shall be as agreed upon between the purchaser and the
manufacturer at the time of purchase.
Type 1 Type 2 Type 3 Type 4
Maximum average 90 125 125 135
9.3 Other Tolerances and Limitations:
Maximum per individual impression 105 150 140 150
9.3.1 The permissible variations in cut lengths shall not
exceed a total of 0.25 in. (6.35 mm).
9.3.2 The permissible variation in straightness of rounds
6.2 The manufacturer’s ingot analysis shall be considered
shall not exceed 0.050 in./ft (4.2 mm/m) in any length.
the chemical analysis for products supplied under this specifi-
9.4 Quantity or Weight—For orders requiring up to 100 ft
cation, except for interstitials as specified in 6.3.
(30.5 m) of finished product, the manufacturer may overship by
6.3 When requested by the purchaser at the time of pur-
20 %. When the order is for quantities up to 1000 ft (305 m) or
chase, the manufacturer shall furnish a report certifying the
1000 lb (453.6 kg), the manufacturer may overship by 10 %.
values of the interstitial elements (C, O, N, H) as prescribed in
The permissible overshipment shall be negotiated for orders
Table 3 for each lot of material supplied.
larger than this quantity.
7. Mechanical Requirements
10. Quality and Finish
7.1 The annealed materials supplied under this specification
10.1 Finished niobium and niobium alloy bar, rod, and wire
shall conform to the requirements for mechanical properties as
specified in Table 4. shall be free of injurious internal and external imperfections of
a nature that will interfere with the purpose for which it was
8. Temper Designations
8.1 Unless otherwise stated, the materials supplied under
TABLE 5 Permissible Variations in Dimensions for Rolled,
Swaged, or Drawn Rod and Wire
TABLE 3 Additional Chemical Requirements for Finished
Product (When Specified by the Purchaser) Diameter, in. (mm) Tolerances, plus or minus, in. (mm)
Type 2 Type 4 0.02
...
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