ASTM B777-99
(Specification)Standard Specification for Tungsten Base, High-Density Metal
Standard Specification for Tungsten Base, High-Density Metal
SCOPE
1.1 This specification covers the requirements for four classes of machinable, high-density tungsten base metal produced by consolidation of metal powder mixtures of which the composition is mainly tungsten. This material specification may be used for bare parts or be used for parts that may be coated with other materials for protection against corrosion and abrasion.
1.2 Intended Use -Parts made from this material are intended for uses such as weights or counter-balances in static or dynamic balancing high-speed rotating inertia members, radiation shielding, hypervelocity impact, and vibration-damping applications.
1.3 Special Applications -For particular applications, properties or requirements other than those specified in Section 6 of this specification may be important. These alloys may contain elements which make them magnetic. Where freedom from magnetic response is required, this should be specified in the purchase order. Class 4 is not available in a non-magnetic grade. For purposes of this specification, non-magnetic characteristics are defined as material having a maximum magnetic permeability of 1.05 (see Test Method B193). Also for special applications involving large sections, methods for determining internal quality, such as mechanical tests on specimens from these larger sections or suitable nondestructive tests may be applied. If required, these additional tests shall be specified in the purchase order.
1.4 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
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Designation: B 777 – 99
Standard Specification for
Tungsten Base, High-Density Metal
This standard is issued under the fixed designation B 777; 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 B 311 Test Method for Density Determination for Powder
Metallurgy (P/M) Materials Containing Less than Two
1.1 This specification covers the requirements for four
Percent Porosity
classes of machinable, high-density tungsten base metal pro-
D 3951 Practice for Commercial Packaging
duced by consolidation of metal powder mixtures of which the
E 3 Test Methods for Preparation of Metallographic Speci-
composition is mainly tungsten. This material specification
mens
may be used for bare parts or be used for parts that may be
E 8 Test Methods forTensionTesting of Metallic Materials
coatedwithothermaterialsforprotectionagainstcorrosionand
E 18 Test Methods for Rockwell Hardness and Rockwell
abrasion.
Superficial Hardness of Metallic Materials
1.2 Intended Use— Parts made from this material are
E 407 Practice for Microetching Metals and Alloys
intended for uses such as weights or counter-balances in static
2.2 Federal Standard:
or dynamic balancing, high-speed rotating inertia members,
Fed. Std. No. 151 Metals, Test Methods
radiation shielding, hypervelocity impact, and vibration-
damping applications.
3. Classification
1.3 Special Applications—For particular applications, prop-
3.1 Thetungstenbasemetalshallbeofthefollowingclasses
erties or requirements other than those specified in Sections 5,
(see Table 1 and Table 2), as specified (see 4.1):
6, and 7 of this specification may be important. These alloys
Class Tungsten, Nominal %
may contain elements which make them magnetic. Where
freedom from magnetic response is required, this should be
specified in the purchase order. Class 4 is not available in a 2 92.5
non-magnetic grade. For purposes of this specification, non-
magnetic characteristics are defined as material having a
maximum magnetic permeability of 1.05 (see Test Method
4. Ordering Information
B 193). Also for special applications involving large sections,
4.1 Orders for tungsten base, high-density metal should
methods for determining internal quality, such as mechanical
specify the following:
tests on specimens from these larger sections or suitable
4.1.1 Title, designation, and year of issue of this specifica-
nondestructive tests may be applied. If required, these addi-
tion,
tional tests shall be specified in the purchase order.
4.1.2 Class, (see 3.1),
1.4 The values stated in inch-pound units are to be regarded
4.1.3 Machinability requirements, if any (see section7.3),
as the standard. The values given in parentheses are for
4.1.4 Quantity,
information only.
4.1.5 Levels of preservation and packing (see 9.1),
4.1.6 Special markings, if required (see 9.2),
2. Referenced Documents
4.1.7 Method of hardness testing, if different from Rock-
2.1 ASTM Standards:
well“ C” (see Table 1),
A 600 Specification for Tool Steel Highspeed
4.1.8 Freedom of parts from magnetic response, if required
B 193 Test Method for Resistivity of Electrical Conductor
(see 1.3), and
Materials
4.1.9 Dimensions and tolerances.
This specification is under the jurisdiction of ASTM Committee B-10 on
Reactive and Refractory Metals and Alloysand is the direct responsibility of
Subcommittee B10.04on Molybdenum and Tungsten. Annual Book of ASTM Standards, Vol 02.05.
Current edition approved Dec. 10, 1999. Published January 2000. Originally Annual Book of ASTM Standards, Vol 15.09.
e1 6
published as B 777-87. Last previous edition B 777-87 (Reapproved 1993) . Annual Book of ASTM Standards, Vol 03.01.
2 7
Annual Book of ASTM Standards, Vol 01.05. AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
Annual Book of ASTM Standards, Vol 02.03. Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B 777
TABLE 1 Composition, Density and Hardness Properties
8.2 Responsibility for Compliance—All parts must meet all
A,B
Nominal Hardness the requirements agreed upon by purchaser and manufacturer
Density,
Class Tungsten, Rockwell“ C”,
from Sections 4, 6 and 7. The inspections set forth in this
g/cc
weight % max
specification shall become a part of the manufacturer’s overall
1 90 16.85–17.25 32
inspection system or quality program.
2 92.5 17.15–17.85 33
3 95 17.75–18.35 34 8.3 Quality Conformance Inspection:
4 97 18.25–18.85 35
8.3.1 Inspection Lot— An inspection lot shall consist of a
A
When specified by the purchaser, other hardness testing methods may be
uniform blend from one batch of powder, and submitted for
employed.
B
inspection at one time. If a shipment is made from more than
For mechanically worked or aged material, the hardness can be as high as R
c46. one lot, the purchaser may choose to consider that shipment as
a single inspection lot or may choose to separate the shipment
TABLE 2 Mechanical Properties, Minimum Values into several inspection lots for acceptance purposes.
Yield Strength 8.3.2 Sampling—Unless otherwise specified, a minimum of
Ultimate Tensile
at 0.2 % Off- A
Elongation, two sintered test bars and one chemical analysis sample shall
Strength
Class
set
%
be made from each powder lot.
ksi MPa ksi MPa
8.3.3 Hardness Tests— Each test bar shall be tested for
B B
1110 758 75 517 5
conformance with the hardness requirements of Table 1 (see
B B
2110 758 75 517 5
B B
8.4.1).
3 105 724
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