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ASTM B438/B438M-00a

(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 Grades--Available in three bronze base composition grades identifiable by different graphite contents.
1.2.2 Type--Grades 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
09-Nov-2000
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-00 - Standard Specification for Sintered Bronze Bearings (Oil-Impregnated)
Effective Date
10-Nov-2000
Replaced By
ASTM B438/B438M-04 - Standard Specification for Sintered Bronze Bearings (Oil-Impregnated)
Effective Date
01-Apr-2004

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ASTM B438/B438M-00a - Standard Specification for Sintered Bronze Bearings (Oil-Impregnated)ASTM B438/B438M-00a - Standard Specification for Sintered Bronze Bearings (Oil-Impregnated)
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ASTM B438/B438M-00a - 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 – 00a
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.
4
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 Orders for parts under this specification shall include the
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 class (Table 1),
1.2.1 Grades—Available in three bronze base composition
3.1.3 Density specification (Table 2 and Table 3), 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
ship to produce a microstructure that is essentially alpha bronze
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
pendently of the other. Combining values from the two systems
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
2.1 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 1.
nected Porosity of Sintered Powder Metal Structural Parts
2
and Oil-Impregnated Bearings
6. Physical Properties
E 9 Test Methods of Compression Testing of Metallic Ma-
6.1 Density—The density of bearings supplied impregnated
3
terials at Room Temperature
with lubricant shall be within the limits prescribed in Table 2
Volume 03.05 Annual Book of ASTM Standards
and Table 3, when determined in accordance with Test Method
2.2 Government Standards:
B 328.
MIL-PRF-6085 Lubricating Oil: Instrument, Aircraft, Low
6.2 Oil Content—Oil content of bearings shall not be less
4
Volatility
than shown in Table 4 for each grade and type when deter-
MIL-L-17331 Lubrication Oil: Steam Turbine and Gear,
mined in accordance with Test Method B 328.
4
Moderate Service
7. Mechanical Properties
7.1 The manufacturer and purchaser shall agree on a repre-
1
This specification is under the jurisdiction of ASTM Committee B-9 on Metal
sentative number of specimens for tests.
Powders and Metal Powder Products and is the direct responsibility of Subcom-
7.2 Radial Crushing Force—Radial crushing force shall be
mittee B09.04 on Bearings.
determined by compressing the test specimen between two flat
Current edition approved Nov. 10, 2000. Published January 2001. Originally
published as B 438 – 66 T. Last previous edition B 438 – 00.
steel surfaces at a “no load” speed not greater than 0.2 in./min
2
Annual Book of ASTM Standards, Vol 02.05.
[5.0 mm/min], the direction of the load being normal to the
3
Annual Book of ASTM Standards, Vol 03.01.
4
longitudinal axis of the specimen. The point at which the load
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
Robbins Ave., Philadelphia, PA 19111–5094, Attn: NPODS. drops as a result of the first crack shall be considered the
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
B 438/B 438M – 00a
TABLE 1 Chemical Requirements (Composition, %)
7.2.2 Concerning spherical bearings, sample parts from a lot
Element Grade 1 Grade 2 Grade 3 will be machined to a straight wall and radially crushed to
calculate t
...

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