ASTM B255-83a(1995)e1

Standard Specification for Sintered Bronze Structural Parts (Withdrawn 2000)

SCOPE
1.1 This specification covers sintered metal powder structural parts made from one copper-tin composition of two types depending on density.  
1.2 The values stated in inch-pound units are to be regarded as standard. The SI values in parentheses are for information only and may be approximate.  Note 1-Definitions of powder metallurgy terms can be found in Definitions B243 and additional useful information is available in the Related Material section of Vol 02.05 of the Annual Book of ASTM Standards .

General Information

• Status: Withdrawn
• Publication Date: 31-Dec-1994
• Withdrawal Date: 09-Oct-2000
• ICS: 77.160 - Powder metallurgy
• Technical Committee: B09 - Metal Powders and Metal Powder Products
• Drafting Committee: B09.05 - Structural Parts

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
e1
Designation: B 255 – 83a (Reapproved 1995)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
Sintered Bronze Structural Parts
This standard is issued under the fixed designation B 255; 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.
e NOTE—Keywords were added editorially in October 1995.
TABLE 1 Chemical Requirements
1. Scope
Element Composition, %
1.1 This specification covers sintered metal powder struc-
Copper 87.5 to 90.5
tural parts made from one copper–tin composition of two types
Tin 9.5 to 10.5
depending on density.
Carbon, max 1.75
1.2 The values stated in inch-pound units are to be regarded
Iron, max 1.0
Total other elements, max 0.5
as the standard. The values given in parentheses are for
information only.
NOTE 1—Definitions of powder metallurgy terms can be found in
5. Chemical Composition
Terminology B 243 and additional useful information is available in the
5.1 Orders for parts shall conform to the requirements
Related Material section of Vol 02.05 of the Annual Book of ASTM
prescribed in Table 1.
Standards.
5.2 The chemical analysis shall be made in accordance with
2. Referenced Documents
Test Methods E 54 or any other standard method agreed upon
between the manufacturer and the purchaser.
2.1 ASTM Standards:
B 243 Terminology of Powder Metallurgy
6. Physical Properties
B 328 Test Method for Density, Oil Content, and Intercon-
6.1 Density:
nected Porosity of Sintered Powder Metal Structural Parts
6.1.1 If the density does not vary more than 0.3 g/cm from
and Oil–Impregnated Bearings
one section of the structural part to any other section, the
E 54 Test Methods for Chemical Analysis of Special
overall density shall fall within the limits prescribed in Table 2.
Brasses and Bronzes
6.1.2 If the density varies more than 0.3 g/cm from one
3. Ordering Information
section of the part to any other, the manufacturer and the
purchaser shall agree upon the critical section of the part where
3.1 Orders for parts under this specification shall include the
the stresses are highest. The density of this critical section,
following information:
rather than the average density, shall fall within the limits
3.1.1 Dimensions (see Section 8),
prescribed in Table 2.
3.1.2 Chemical composition (see Section 5 and Table 1),
6.1.3 Density shall be determined in accordance with Test
3.1.3 Density, Type (see 6.1 and Table 2),
Method B 328.
3.1.4 Porosity (see 6.2),
6.2 Porosity:
3.1.5 Mechanical requirements (see Section 7), and
6.2.1 When specified, the interconnecting porosity
3.1.6 Certification (see Section 13).
by volume shall not be less than the values prescribed in
4. Materials and Manufacture
Table 3.
6.2.2 The porosity shall be determined in accordance with
4.1 Structural parts shall be made by molding and sintering
Test Method B 328.
metal powders followed by repressing and resintering, if
necessary, to produce finished parts conforming to the require-
7. Mechanical Properties
ments of this specification.
7.1 The manufacturer and the purchaser shall agree on
qualification tests for the determination of mechanical proper-
ties.
This specification is under the jurisdiction of ASTM Committee B-9 on Metal
Powders and Metal Powder Products and is the direct responsibility of Subcom-
mittee B09.05 on Structural Parts.
TABLE 2 Density Requirements
Current edition approved Jan. 28 and March 25, 1983. Published May 1983.
Type Dry Density, g/cm
Originally Published as B 255-51 T. Last previous edition B 255-70 (1976).
2 I 6.4 to 6.8
Annual Book of ASTM Standards, Vol 02.05.
II 6.8 to 7.2
Annual Book of ASTM Standards, Vol 03.05.
B 255
TABLE 3 Porosity
from each lot. A sample shall consist of chips, obtained by
Type Porosity, min, Volume % dry-milling, drilling, or crushing of at least two pieces.
I18
10.3 Mechanical Tests—The manufacturer and purchaser
II 7
shall agree upon a representative number of specimens for
mechanical tests.
7.2 These tests shall be performed on production parts.
11. Inspection
7.3 The tests shall be determined after consideration of the
11.1 Unless otherwise specified, inspection of parts supplied
function
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