ASTM B393-05
(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.
SCOPE
1.1 This specification covers five grades of wrought niobium and niobium alloy strip, sheet, and plate as follows:
Note 1—Committee B10 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.
1.1.5 R0xxxx-Type 5— RRR grade pure niobium.
Note 2—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 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: B393 – 05
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. 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 E8 Test Methods for Tension Testing of Metallic Materials
E29 Practice for Using Significant Digits in Test Data to
1.1 This specification covers five grades of wrought nio-
Determine Conformance with Specifications
bium and niobium alloy strip, sheet, and plate as follows:
NOTE 1—Committee B10 has adopted “niobium” as the designation for 3. Terminology
Element No. 41, formerly named “columbium.”
3.1 Definitions of Terms Specific to This Standard:
1.1.1 R04200-Type 1—Reactor grade unalloyed niobium,
3.1.1 lot, n—alotshallconsistofallmaterialproducedfrom
1.1.2 R04210-Type 2—Commercial grade unalloyed nio-
the same ingot at one time, with the same cross section,
bium,
processed with the same nominal metallurgical parameters and
1.1.3 R04251-Type 3—Reactor grade niobium alloy con-
heat treated at the same conditions.
taining 1 % zirconium, and
3.1.2 plate, n—a flat product 6 in. (152.4 mm) or more in
3
1.1.4 R04261-Type 4—Commercial grade niobium alloy
width and greater than ⁄16 in. (4.76 mm) in thickness.
containing 1 % zirconium.
3.1.3 sheet, n—a flat product 6 in. (152.4 mm) or more in
3
1.1.5 R0xxxx-Type 5—RRR grade pure niobium.
width and from 0.005 in. (0.13 mm) to ⁄16 in. (4.76 mm) in
thickness.
NOTE 2—Thisgradeofniobiumisusedinsuperconductingapplications
3.1.4 strip, n—aflatproduct,whichmaybesuppliedincoil,
that require the ultra high purity. Because of the high purity the product is
less than 6 in. (152.4 mm) in width and from 0.005 in. (0.13
conducive to very large grains that can adversely affect formability. It is
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not recommended for other applications.
mm) to ⁄16 in. (4.76 mm) in thickness.
1.2 Except for dimensional tolerances in Table 1, the values
4. Ordering Information
stated in inch-pound units are to be regarded as the standard.
4.1 Orders for materials under this specification shall in-
The values given in parentheses are for information only.
clude the following information as applicable:
1.3 The following precautionary caveat pertains only to the
4.1.1 Type and grade (Section 1),
test methods portion of this specification. This standard does
4.1.2 ASTM designation and year of issue,
not purport to address all of the safety concerns, if any,
4.1.3 Quantityinweight,numberofpieces,anddimensions,
associated with its use. It is the responsibility of the user of this
4.1.4 Chemistry (6.3),
standard to establish appropriate safety and health practices
4.1.5 Temper designation (Section 8),
and determine the applicability of regulatory limitations prior
4.1.6 Permissible overshipment (9.3),
to use.
4.1.7 Quality and finish (10.3),
2. Referenced Documents 4.1.8 Sampling (11.2),
2 4.1.9 Inspection (Section 15),
2.1 ASTM Standards:
4.1.10 Required reports (Section 17),
B391 Specification for Niobium and Niobium Alloy Ingots
4.1.11 Marking (Section 18), and
4.1.12 Additions to the specification and supplementary
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This specification is under the jurisdiction of ASTM Committee B10 on
requirements, as required.
Reactive and Refractory Metals and Alloys and is the direct responsibility of
Subcommittee B10.03 on Niobium and Tantalum.
5. Materials and Manufacture
Current edition approved May 1, 2005. Published June 2005. Originally
approved in 1999. Last previous edition approved in 2003 as B393 - 03. DOI: 5.1 Material covered by this specification shall be made
10.1520/B0393-05.
from ingots that conform to Specification B391 and that are
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
produced by vacuum or plasma arc melting, vacuum electron-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
beam melting, or a combination of these three methods.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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B393 – 05
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) in lower table minus, in.(mm) in lower table
Thickness of Material,
Length 12 in. or 304.8 mm
Width6to24in. Width6to24in.
in. (mm) in lower table Length over 12 in. or 304.8 mm
Width under 6 in. Width under 6 in.
and under
or 152.4 to or 152.4
...
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