ASTM B439-00e1
(Specification)Standard Specification for Iron-Base Sintered Bearings (Oil-Impregnated)
Standard Specification for Iron-Base Sintered Bearings (Oil-Impregnated)
SCOPE
1.1 This specification covers sintered metal powder, oil-impregnated, bearings of four iron-base compositional grades:
Grades 1 and 2—iron-carbon
Grades 3 and 4—iron-copper
1.2 The values stated in inch-pound units are to be regarded as the standard. The metric equivalents of inch-pound units may be approximate.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
e1
Designation: B 439 – 00
Standard Specification for
1
Iron-Base Sintered Bearings (Oil-Impregnated)
This standard is issued under the fixed designation B 439; 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.
1
e NOTE—Section 9.2 was editorially corrected in May 2003.
1. Scope 5. Chemical Requirements
1.1 This specification covers sintered metal powder, oil- 5.1 The material shall conform to the requirements as to the
impregnated, bearings of four iron-base compositional grades: chemical composition prescribed in Table 1.
Grades 1 and 2—iron-carbon
6. Physical Properties
Grades 3 and 4—iron-copper
1.2 The values stated in inch-pound units are to be regarded 6.1 Density—Thedensityofbearingssuppliedfullyimpreg-
nated with lubricant shall be within the limits prescribed in
as the standard. The metric equivalents of inch-pound units
may be approximate. Table 2.
6.2 Oil Content—Oil content of bearings shall not be less
2. Referenced Documents
than that shown in Table 2.
2.1 ASTM Standards: 6.3 Radial Crushing Strength—Radial crushing strength
B 328 Test Method for Density, Oil Content, and Intercon- shall not be less than the value calculated as follows:
nected Porosity of Sintered Powder Metal Structural Parts
2
P 5KLT /~D –T! (1)
2
and Oil-Impregnated Bearings
E9 Test Methods of Compression Testing of Metallic Ma-
where:
3
terials at Room Temperature P = radial crushing strength, lbf (or N);
D = outside diameter of bearing, in. (or mm);
3. Ordering Information
T = wall thickness of bearing, in. (or mm);
K = strength constant as shown in Table 3 for grade
3.1 Orders for material under this specification shall include
specified, psi (MPa); and
the following information:
L = length of bearing, in. (or mm).
3.1.1 Grade (Section 5),
3.1.2 Density (6.1),
3.1.3 Dimensions, and
7. Workmanship, Finish, and Appearance
3.1.4 Certification (12.1).
7.1 Bearings shall be uniform in composition. When cut or
4. Manufacture
fractured, the exposed surface shall be of uniform appearance.
The parts shall be free from defects which would affect their
4.1 Bearings shall be made by briquetting and sintering
serviceability.
metal powders, with or without sizing, so as to produce
finished parts conforming to the requirements of this specifi-
8. Sampling
cation.
8.1 Lot—Unless otherwise specified, a lot shall consist of
parts of the same form and dimensions made from powders of
1
This specification is under the jurisdiction ofASTM Committee B09 on Metal
the same composition, formed and sintered under the same
Powders and Metal Powder Products and is the direct responsibility of Subcom-
conditions, and submitted for inspection at one time.
mittee B09.04 on Bearings.
Current edition approved October 10, 2000. Published December 2000. Origi- 8.2 Sample for Chemical Analysis—At least one sample for
nally published as B 439–66 T to replace portions of B 202. Last previous edition
chemicalanalysisshallbetakenfromeachlot.Arepresentative
B 439–95 (2000).
sample of chips may be obtained by milling, drilling, or
2
Annual Book of ASTM Standards, Vol 02.05.
3
crushing at least two pieces with clean dry tools without
Annual Book of ASTM Standards, Vol 03.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
e1
B439–00
TABLE 1 Chemical Requirements
Composition, %
Element
Grade 1 Grade 2 Grade 3 Grade 4
Copper 0–1.5 0–1.5 9.0–11.0 18.0–22.0
Iron balance balance balance balance
Total other elements by difference, max 2.0 2.0 2.0 2.0
A
Combined carbon (on basis of iron only) 0.3 max 0.3–0.6 0.3 max 0.3 max
A
The combined carbon may be a metallographic estimate of the carbon in the iron.
TABLE 2 Density and Oil Content Requirements
load drops as a result of the first crack shall be considered the
3
Density, g/cm crushing strength. This test shall be applied to plain cylindrical
Oil Content,
Grade
min max Volume, % min
bearings. Flanged bearings shall be tested by cutting off the
1 and 2 5.6 6.0 21
flange and compressing the two sections separately. Each
3 and 4 5.8 6.2 19
section shall meet the minimum strength requirements pre-
scribed in 6.3.
TABLE 3 Strength Constants
10. Inspection
K (Strength Constant),
Grade
psi (MPa)
10.1 Unless otherwise specified, inspection of parts sup-
1 15 000 (105) plied on contract shall be made by the purchaser at the
2 20 000 (140)
destination.
3 30 000 (205)
4 30 000 (205)
11. Rejection
11.1 Rejection based on tests
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.