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METAL POWDER SINTERED BEARINGS(OIL IMPREGNATED)
ASTM Designation:B 202-64
ADOPTED,1964.
Scope
1.These specifcations cover sintered, metal powder,oil-impregnated bearings of two types and four classes as follows:
(a) Grade I, Copper Base:
Class A, Copper-Tin
Class B, Copper-Lead-Tin
Note - The compositions included in grade I are intended to be equivalent so far as application is concerned,the different compositions representing the products supplied by different manufacturers for the same service.
(b) Grade II, Iron Base:
Class A,Iron-Carbon
Class B,Iron-Copper
Note - The compositions in class A represent different mechanical properties and must be identifed by subclasses since they constitute separate specifications.The copper content of class B may vary over rather wide limits.
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Grade I, Copper Base |
Grade II, Iron Base |
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Class A |
Class B |
Class A |
Class B |
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A1 |
A2 |
A3 |
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Copper, % |
87.5 to 90.6 |
82.6 to 88.5 |
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7.0 to 11.0 18.0 to 22.0 |
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Iron, % |
1.0 max |
1.0 max |
96.25 min |
95.9 min |
96.5 min |
remainder* |
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Tin, % |
9.5 to 10.5 |
9.5 to 10.5 |
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Lead, % |
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2.0 to 4.0 |
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Zinc,max, % |
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0.75 |
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Nickel,max, % |
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0.35 |
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Antimony, max, % |
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0.25 |
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Silicon,max, % |
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0.3 |
0.3 |
0.3 |
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Aluminum,max, % |
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0.2 |
0.2 |
0.2 |
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Carbon,max, % |
1.75 |
1.75 |
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Total other elements by difference,max, % |
0.5 |
0.5 |
3.0 |
3.0 |
3.0 |
3.0 |
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Combined carbon (on basis of iron only) |
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0.25 |
0.25 to 0.60 |
0.6 to 1.0 |
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