ASTM B393-18
(Specification)Standard Specification for Niobium and Niobium Alloy Strip, Sheet, and Plate
Standard Specification for Niobium and Niobium Alloy Strip, Sheet, and Plate
ABSTRACT
This specification covers five grades of wrought niobium and niobium alloy strip, sheet, and plate. These are reactor grade unalloyed niobium (R04200-Type 1), commercial grade unalloyed niobium (R04210-Type 2), reactor grade niobium alloy containing 1% zirconium (R04251-Type 3), commercial grade niobium alloy containing 1% zirconium (R04261-Type 4), and RRR grade pure niobium (R0xxxx-Type 5). The RRR grade pure niobium is used in superconducting applications that require ultra high purity, making it conducive to very large grains that can adversely affect formability. It is therefore not recommended for other applications. The materials shall be made from ingots produced by vacuum or plasma arc welding, vacuum electron-beam melting, or a combination of these three methods. The various niobium mill products covered by this specification are formed with the conventional extrusion, forging, swaging, rolling, and drawing equipment normally available in metal working plants. Samples for chemical and tension testing shall be taken from the finished material after the metallurgical processing to determine conformity to this specification. The samples may be taken prior to final inspection and minor surface conditioning by abrasion and pickling shall be representative of the finished product.
SIGNIFICANCE AND USE
13.1 For the purposes of determining compliance with the specified limits for requirements of the properties listed in this specification, an observed value or a calculated value shall be rounded as indicated in accordance with the rounding method of Practice E29.
SCOPE
1.1 This specification covers five grades of wrought niobium and niobium alloy strip, sheet, and plate as follows:
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,
1.1.4 R04261-Type 4—Commercial grade niobium alloy containing 1 % zirconium, and.
1.1.5 R04220-Type 5—RRR grade pure niobium.
Note 1: This grade of niobium is used in superconducting applications that require the ultra high purity. Because of the high purity the product is conducive to very large grains that can adversely affect formability. It is not recommended for other applications.
1.2 Except for dimensional tolerances in Table 1, the values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. (A) Tolerance on thickness of sheet over 24 in. (610 mm) wide shall be ±10 % of the thickness.(B) Tolerance on width of sheared sheet shall be ±1/16 in. (±1.6 mm) and on sheared plate shall be ±1/8 in. (±3.2 mm) up to material thickness of 0.375 in. (9.5 mm).
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 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.
General Information
Relations
Standards Content (Sample)
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:B393 −18
Standard Specification for
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Niobium and Niobium Alloy Strip, Sheet, and Plate
This standard is issued under the fixed designation B393; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
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2.1 ASTM Standards:
1.1 This specification covers five grades of wrought nio-
B391Specification for Niobium and Niobium Alloy Ingots
bium and niobium alloy strip, sheet, and plate as follows:
E8/E8MTest Methods for Tension Testing of Metallic Ma-
1.1.1 R04200-Type 1—Reactor grade unalloyed niobium,
terials
1.1.2 R04210-Type 2—Commercial grade unalloyed
E29Practice for Using Significant Digits in Test Data to
niobium,
Determine Conformance with Specifications
1.1.3 R04251-Type 3—Reactorgradeniobiumalloycontain- E2626Guide for Spectrometric Analysis of Reactive and
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ing 1% zirconium, Refractory Metals (Withdrawn 2017)
1.1.4 R04261-Type 4—Commercial grade niobium alloy
3. Terminology
containing 1% zirconium, and.
3.1 Definitions of Terms Specific to This Standard:
1.1.5 R04220-Type 5—RRR grade pure niobium.
3.1.1 lot, n—alotshallconsistofallmaterialproducedfrom
NOTE1—Thisgradeofniobiumisusedinsuperconductingapplications the same ingot at one time, with the same cross section,
that require the ultra high purity. Because of the high purity the product is
processed with the same nominal metallurgical parameters and
conducive to very large grains that can adversely affect formability. It is
heat treated at the same conditions.
not recommended for other applications.
3.1.2 plate, n—a flat product 6 in. (152.4 mm) or more in
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1.2 Except for dimensional tolerances in Table 1, the values
width and greater than ⁄16 in. (4.76 mm) in thickness.
stated in inch-pound units are to be regarded as standard. The
3.1.3 sheet, n—a flat product 6 in. (152.4 mm) or more in
valuesgiveninparenthesesaremathematicalconversionstoSI
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width and from 0.005 in. (0.13 mm) to ⁄16 in. (4.76 mm) in
units that are provided for information only and are not
thickness.
considered standard.
3.1.4 strip, n—aflatproduct,whichmaybesuppliedincoil,
1.3 The following precautionary caveat pertains only to the less than 6 in. (152.4 mm) in width and from 0.005 in. (0.13
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mm) to ⁄16 in. (4.76 mm) in thickness.
test methods portion of this specification. This standard does
not purport to address all of the safety concerns, if any,
4. Ordering Information
associated with its use. It is the responsibility of the user of this
standard to establish appropriate safety, health, and environ- 4.1 Orders for materials under this specification shall in-
mental practices and determine the applicability of regulatory clude the following information as applicable:
4.1.1 Type and grade (Section 1),
limitations prior to use.
4.1.2 ASTM designation and year of issue,
1.4 This international standard was developed in accor-
4.1.3 Quantityinweight,numberofpieces,anddimensions,
dance with internationally recognized principles on standard-
4.1.4 Chemistry (6.3),
ization established in the Decision on Principles for the
4.1.5 Temper designation (Section 8),
Development of International Standards, Guides and Recom-
4.1.6 Permissible overshipment (9.3),
mendations issued by the World Trade Organization Technical
4.1.7 Quality and finish (10.3),
Barriers to Trade (TBT) Committee.
4.1.8 Sampling (11.2),
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This specification is under the jurisdiction of ASTM Committee B10 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Reactive and Refractory Metals and Alloys and is the direct responsibility of contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Subcommittee B10.03 on Niobium and Tantalum. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved April 1, 2018. Published May 2018. Originally the ASTM website.
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approvedin1999.Lastpreviouseditionapprovedin2009asB393–09 whichwas The last approved version of this historical standard is referenced on
withdrawn January 2018 and reinstated in April 2018. DOI: 10.1520/B0393-18. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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B393−18
TABLE 1 Dimensional Tolerances for Niobium Flat-Rolled Products
A B
Tolerance on Thickness plus or Tolerance on Width (slit) plus or
Tolerance on Sheared Lengths, in. (mm)
minus, in. (mm)
...
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