ASTM B392-18

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:B392 −18
Standard Specification for
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Niobium and Niobium Alloy Bar, Rod, and Wire
This standard is issued under the fixed designation B392; 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 E2626 Guide for Spectrometric Analysis of Reactive and
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Refractory Metals (Withdrawn 2017)
1.1 This specification covers four grades of wrought nio-
bium and niobium alloy bar, rod, and wire as follows:
3. Terminology
1.1.1 R04200-Type 1—Reactor grade unalloyed niobium,
3.1 Definitions of Terms Specific to This Standard:
1.1.2 R04210-Type 2—Commercial grade unalloyed
niobium, 3.1.1 lot, n—alotshallconsistofallmaterialproducedfrom
the same ingot at one time, with the same cross section,
1.1.3 R04251-Type 3—Reactorgradeniobiumalloycontain-
ing 1 % zirconium, and processed with the same nominal metallurgical parameters and
heat treated at the same conditions.
1.1.4 R04261-Type 4—Commercial grade niobium alloy
containing 1 % zirconium.
3.1.2 bar, n—material less than 6 in. (152.4 mm) in width
and 0.187 in. (4.75 mm) or greater in thickness, with a
1.2 The values stated in inch-pound units are to be regarded
rectangular cross section, supplied in straight lengths.
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only
3.1.3 rod, n—material 0.125 to 2.50 in. (3.18 to 63.50 mm)
and are not considered standard.
in diameter, in round, hexagonal, or octagonal cross section
supplied in straight lengths.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.1.4 wire, n—material 0.020 to 0.124 in. (0.51 to 3.15 mm)
responsibility of the user of this standard to establish appro-
in diameter, furnished in coils or on spools or reels. Material
priate safety, health, and environmental practices and deter-
less than 0.020 in. (0.51 mm) in diameter is not covered by this
mine the applicability of regulatory limitations prior to use.
specification.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard- 4. Ordering Information
ization established in the Decision on Principles for the
4.1 Orders for materials under this specification shall in-
Development of International Standards, Guides and Recom-
clude the following information as applicable:
mendations issued by the World Trade Organization Technical
4.1.1 Type and grade (Section 1),
Barriers to Trade (TBT) Committee.
4.1.2 ASTM designation and year of issue,
4.1.3 Method of manufacture (Section 5),
2. Referenced Documents
4.1.4 Temper designation (Section 8),
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2.1 ASTM Standards:
4.1.5 Quantityinweight,numberofpieces,anddimensions,
B391 Specification for Niobium and Niobium Alloy Ingots
4.1.6 Chemistry (6.3),
E8/E8M Test Methods for Tension Testing of Metallic Ma-
4.1.7 Mechanical properties (Section 7),
terials
4.1.8 Condition (8.2),
E29 Practice for Using Significant Digits in Test Data to
4.1.9 Permissible Variations (9.2),
Determine Conformance with Specifications
4.1.10 Permissible overshipments (9.4),
4.1.11 Quality and finish (Section 10),
4.1.12 Sampling (Section 11),
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This specification is under the jurisdiction of ASTM Committee B10 on
4.1.13 Inspection (Section 15),
Reactive and Refractory Metals and Alloys and is the direct responsibility of
4.1.14 Required reports (Section 17), and
Subcommittee B10.03 on Niobium and Tantalum.
4.1.15 Additions to the specification and supplementary
Current edition approved April 1, 2018. Published May 2018. Originally
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approvedin1989.Lastpreviouseditionapprovedin2009asB392 –09 whichwas requirements, as required.
withdrawn January 2018 and reinstated in April 2018. DOI: 10.1520/B0392-18.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
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B392−18
TABLE 2 Additional Chemical Requirements for Finished Product
5. Materials and Manufacture
(When Specified by the Purchaser)
5.1 Material covered by this specification shall be made
T
...