ASTM B760-07(2023)

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: B760 − 07 (Reapproved 2023)
Standard Specification for
Tungsten Plate, Sheet, and Foil
This standard is issued under the fixed designation B760; 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 between manufacturer and purchaser, a lot shall be limited to
the product of an 8 h period for final continuous anneal, or to
1.1 This specification covers wrought unalloyed tungsten
a single furnace load for final batch anneal.
plate, sheet, and foil.
3.1.3 A chemical analysis lot shall consist of a single
1.2 The values stated in inch-pound units are to be regarded
powder blend in the case of products manufactured from
as standard. The values given in parentheses are mathematical
pressed and sintered powder metallurgy shapes, or a single
conversions to SI units that are provided for information only
ingot in the case of products manufactured from ingot.
and are not considered standard.
3.2 Product Forms:
1.3 The following precautionary caveat pertains only to the
3.2.1 foil, n—a flat product less than 0.005 in. (0.13 mm) in
test method portions of this specification: This standard does thickness.
not purport to address all of the safety concerns, if any,
3.2.2 plate, n—a flat product 0.188 in. (4.75 mm) or more in
associated with its use. It is the responsibility of the user of this
thickness.
standard to establish appropriate safety, health, and environ-
3.2.3 sheet, n—a flat product from .005 in. (0.13 mm) to
mental practices and determine the applicability of regulatory
0.187 in. (4.75 mm) in thickness.
limitations prior to use.
1.4 This international standard was developed in accor-
4. Ordering Information
dance with internationally recognized principles on standard-
4.1 Orders for material under this specification shall include
ization established in the Decision on Principles for the
the following information:
Development of International Standards, Guides and Recom-
4.1.1 Material identification and metallurgical condition
mendations issued by the World Trade Organization Technical
(Section 7),
Barriers to Trade (TBT) Committee.
4.1.2 Product form (Section 3),
4.1.3 Chemical requirements (Table 1),
2. Referenced Documents
4.1.4 Tolerances (Section 9, Table 2, and Fig. 1),
2.1 ASTM Standards:
4.1.5 Workmanship and quality level requirements (Section
E29 Practice for Using Significant Digits in Test Data to
10),
Determine Conformance with Specifications
4.1.6 Packaging (Section 14),
4.1.7 Marking (Section 14),
3. Terminology
4.1.8 Certification and reports (Section 13), and
3.1 Lot Definitions:
4.1.9 Disposition of rejected material (Section 12).
3.1.1 ingot, n—no definition required.
5. Materials and Manufacture
3.1.2 A manufacturing lot shall consist of a material of the
same size, shape, condition, and finish produced from the ingot
5.1 The various tungsten flat products covered by this
or powder blend by the same rolling reduction schedule and the
specification shall be formed with the conventional rolling,
same heat treatment parameters. Unless otherwise agreed
forging, or extrusion equipment, normally found in primary
ferrous and nonferrous plants.
5.2 The ingot metal is consolidated employing either the
This specification is under the jurisdiction of ASTM Committee B10 on
Reactive and Refractory Metals and Alloys and is the direct responsibility of
powder metallurgy or vacuum-arc-casting process.
Subcommittee B10.04 on Molybdenum and Tungsten.
Current edition approved Nov. 1, 2023. Published November 2023. Originally
6. Chemical Composition
approved in 1986. Last previous edition approved in 2019 as B760 – 07 (2019).
DOI: 10.1520/B0760-07R23.
6.1 The tungsten ingots or billets for conversion to finished
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
products covered by this specification shall conform to the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
requirements of the chemical composition prescribed in Table
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 1.
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B760 − 07 (2023)
TABLE 1 Chemical Composition/Check Analysis
Property Rounded Unit for Observed
or Calculated Value
Composition, Permissible Variations in
Element
max, % Check Analysis, %
Chemical composition, and tolerances nearest unit in the last right-hand place
C 0.010 ±0.002
(when expressed as decimals) of figures of the specified limit
A
O 0.010 + 10 % relative
Tensile strength and yield strength nearest 1000 psi (10 MPa)
N 0.010 + 0.0005
Elongation nearest 1 %
Fe 0.010 + 0.001
Ni 0.010 + 0.001
9. Permissible Variations in Dimensions
Si 0.010 + 0.001
A
If chemical analysis is performed on a sample from the powder blend used to 9.1 The thickness tolerances on tungsten products covered
make the finished product, oxygen will be reported for information only.
by this specification shall be as specified in Table 2.
9.2 The width tolerances shall be as agreed upon between
the manufacturer and the purchaser. In general, shearing
tolerance will be 6 ⁄16 in. (61.6 mm) and slitting tolerance will
6.2 Heat Analysis:
be 6 ⁄32 in. (60.8 mm).
6.2.1 Heat analysis is an analysis made by the manufacturer
9.3 The length and camber tolerances shall be as agreed
of the metal on a representative sample of powder from a single
upon between the manufacturer and the purchaser. In general,
powder blend in the case of material made from pressed and
length and camber tolerances will show a maximum deviation
sintered powder billets, or on a representative sample of a cast
of + ⁄16 in., − 0/ft (1.6 mm/m) of length.
ingot or intermediate product from that ingot in the case of
9.4 Flatness tolerances on tungsten flat products shall be as
material made from cast ingot.
follows:
6.2.2 Chemical lot analysis shall be as specified in Table 1,
with the exception of oxygen which shall be reported for Thickness, in.(mm) Flatness Deviation,
max,%
information only, and not be required to meet the requirements
0.005–0.187 (0.13–4.75) 4
of Table 1.
0.188–0.625 (4.75–15.9) 5
6.3 Check Analysis:
9.4.1 Determine flatness deviation (Fig. 1) as follows:
6.3.1 Check analysis is an analysis made by the purchaser or
Flatness deviation, % 5 H/L × 100
~ !
the manufacturer of the metal after it has been processed into
where:
finished mill forms, and is either for the purpose of verifying
the composition of a heat or lot, or to determine variations in
H = maximum vertical distance between a flat reference
the composition within a heat or lot. surface and the lower surface of the flat product, and
6.3.2 Check analysis tolerances do not broaden the specified L = minimum horizontal distance between the highest point
of the flat product where H is determined, and the point
heat analysis requirements but cover variations between labo-
ratories in the measurement of chemical content. of contact of the lower surface of the flat product with
a flat reference surface.
6.3.3 Check analysis limits shal
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