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ASTM B438/B438M-04

(Specification)

Standard Specification for Sintered Bronze Bearings (Oil-Impregnated)

Standard Specification for Sintered Bronze Bearings (Oil-Impregnated)

SCOPE
1.1 This specification covers sintered bronze, oil-impregnated bearings made primarily from elemental copper, tin, and graphite powders. The manufacturer may, at his discretion, use prealloyed bronze powder in the blend.
1.2 This specification covers the following variables:
1.2.1 GradesAvailable in four bronze base composition grades identifiable by different graphite contents.
1.2.2 TypeGrades 1 and 2 are available in four types described by specific density ranges.
1.3 Bearings ordered to this specification will normally be sized after sintering and will be impregnated with a lubricating oil unless otherwise specified by print.
1.4 The values stated in either inch-pound or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

General Information

Status
Historical
Publication Date
31-Mar-2004
ICS
21.100.01 - Bearings in general
Technical Committee
B09 - Metal Powders and Metal Powder Products
Drafting Committee
B09.04 - Bearings
Current Stage
Ref Project

Relations

Replaces
ASTM B438/B438M-00a - Standard Specification for Sintered Bronze Bearings (Oil-Impregnated)
Effective Date
01-Apr-2004
Replaced By
ASTM B438/B438M-05 - Specification for Bronze Powder Metallurgy (P/M) Bearing (Oil-Impregnated)
Effective Date
01-Nov-2005

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ASTM B438/B438M-04 - Standard Specification for Sintered Bronze Bearings (Oil-Impregnated)ASTM B438/B438M-04 - Standard Specification for Sintered Bronze Bearings (Oil-Impregnated)
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ASTM B438/B438M-04 - Standard Specification for Sintered Bronze Bearings (Oil-Impregnated)
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: B 438/B 438M – 04
Standard Specification for
1
Sintered Bronze Bearings (Oil-Impregnated)
This standard is issued under the fixed designation B 438/B 438M; 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.
This standard has been approved for use by agencies of the Department of Defense.
3
1. Scope FED-STD-151 Metals Test Method
1.1 This specification covers sintered bronze, oil-
3. Ordering Information
impregnated bearings made primarily from elemental copper,
3.1 Ordersforpartsunderthisspecificationshallincludethe
tin, and graphite powders. The manufacturer may, at his
following information:
discretion, use prealloyed bronze powder in the blend.
3.1.1 Dimensions and tolerances (Section 9),
1.2 This specification covers the following variables:
3.1.2 Grade and type,
1.2.1 Grades—Available in four bronze base composition
3.1.3 Density specification (Table 1 and Table 2), and
grades identifiable by different graphite contents.
3.1.4 Oil type.
1.2.2 Type—Grades 1 and 2 are available in four types
described by specific density ranges.
4. Materials and Manufacture
1.3 Bearings ordered to this specification will normally be
4.1 Sintered bronze bearings shall be made by molding or
sized after sintering and will be impregnated with a lubricating
briquetting metal powder mixtures to the proper density. The
oil unless otherwise specified by print.
green bearing shall be sintered at a time–temperature relation-
1.4 The values stated in either inch-pound or SI units are to
shiptoproduceamicrostructurethatisessentiallyalphabronze
be regarded separately as standard.Within the text, the SI units
and contains no tin-rich phases visible at 3003. Sintered
are shown in brackets.The values stated in each system are not
bronze bearings are normally sized after sintering to maintain
exact equivalents; therefore, each system shall be used inde-
the dimensional characteristics required of the bearing. After
pendentlyoftheother.Combiningvaluesfromthetwosystems
sizing and inspection, they are impregnated with a lubricating
may result in nonconformance with the specification.
oil unless otherwise specified.
2. Referenced Documents
5. Chemical Composition
2
2.1 ASTM Standards:
5.1 The material shall conform to the requirements as to the
B 328 Test Method for Density, Oil Content, and Intercon-
chemical composition prescribed in Table 3.
nected Porosity of Sintered Metal Structural Parts and
Oil-Impregnated Bearings
6. Physical Properties
E9 Test Methods of Compression Testing of Metallic Ma-
6.1 Density—The density of bearings supplied impregnated
terials at Room Temperature
with lubricant shall be within the limits prescribed in Table 1
2.2 Government Standards:
and Table 2, when determined in accordance with Test Method
MIL-PRF-6085 Lubricating Oil: Instrument, Aircraft, Low
B 328.
3
Volatility
6.2 Oil Content—Oil content of bearings shall not be less
MIL-PRF-17331 Lubrication Oil: Steam Turbine and Gear,
3 than shown in Table 4 for each grade and type when deter-
Moderate Service
mined in accordance with Test Method B 328.
7. Mechanical Properties
1
This specification is under the jurisdiction ofASTM Committee B09 on Metal
Powders and Metal Powder Products and is the direct responsibility of Subcom-
7.1 The manufacturer and purchaser shall agree on a repre-
mittee B09.04 on Bearings.
sentative number of specimens for tests.
Current edition approved April 1, 2004. Published May 2004. Originally
7.2 Radial Crushing Force—Radial crushing force shall be
approved in 1966. Last previous edition approved in 2000 as B 438 – 00a.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or determined by compressing the test specimen between two flat
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
steel surfaces at a “no load” speed not greater than 0.2 in./min
Standards volume information, refer to the standard’s Document Summary page on
[5.0 mm/min], the direction of the load being normal to the
the ASTM website.
3
longitudinal axis of the specimen. The point at which the load
AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
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.
1

---------------------- Page: 1 ----------------------
B 438/B 438M – 04
TABLE 1 Density Requirements (Oil Impregnated)
where:
3
Type Density, g/cm
P = radial crushing force, pounds [N],
A
D = outside diameter of bearing, inches [mm],
Grades 1 and 2 1 5.8–6.2
Grades 1, 2, and 4 2 6
...

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