Standard Specification for Sintered Bronze Bearings (Oil-Impregnated)
This standard is issued under the fixed designation B438/B438M; then umber immediately following the designation indicates the year of original adoption or, in the case of revision,the year of lastre vision. Anumber in parentheses indicates the year of last reapproval. A superscript epsilon(e) indicates an editorial change since the last revision or reapproval.
We produce various oil sintered bronze bushing in material of B438 Grade 1, Grade 2 and Grade 3
Material compositions as below table showing:
TABLE3 Chemical Requirements (Composition,%) |
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Element |
Grade 1 |
Grade 2 |
Grade 3 |
Grade 4 |
Copper |
87.2-90.5 |
85.7-90.0 |
82.8-88.3 |
80.9-88.0 |
Tin |
9.5-10.5 |
9.5-10.5 |
9.2-10.2 |
9.5-10.5 |
Graphite |
0-0.3 |
0.5-1.6 |
2.5-5.0 |
0.50-1.75 |
Iron, max |
1.0 |
1.0 |
1.0 |
1.0 |
Total other elements by difference, max |
1.0 |
1.0 |
1.0 |
0.5 |
Lead |
|
|
|
2.0-4.0 |
Zinc, max |
|
|
|
0.75 |
Nickel, max |
|
|
|
0.35 |
Antimony, max |
|
|
|
0.25 |
Data from: http://www.spboiles.com |
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