Bronze alloys consist primarily of copper, usually with tin as the main additive. The lead content in bearing bronze bars are between 6 percent and 15 percent. High leaded tin bronze alloys are free cutting and retain favorable thermal conductivity and good lubricity due to the lead content. Alloy C932 or C93200 is considered the workhorse alloy and is widely used in many bearing applications.
Alloy C932 is a general purpose bearing alloy possessing good anti-friction properties, ample strength and hardness, adequate ductility and excellent machinability. It is used as bearings, bushings, light duty gears and sprockets, impellers, wear strips, plates, automotive fittings and washers. It is used extensively in pumps, cylinders, machine tools, earth moving machinery and other general purpose applications.
Alloy C932 has a wider range of applicability, and is more often specified, than all other bearing materials. C932 is a high-leaded tin bronze that is used for general utility applications under medium loads and speeds. Strength and hardness are somewhat lower than those of the tin bronzes but C932 excels in antifriction and machining properties.
Alloy C932 Chemical Composition
Chemical Composition (wt%) limits as specified in ASTM B505*
| Copper | 81.0-85.0 | Antimony | 0.35 |
| Tin | 6.3-7.5 | Phosphorus | 1.50 |
| Lead | 6.0-8.0 | Sulfur | 0.08 |
| Zinc | 2.0-4.0 | Aluminum | 0.005 |
| Iron | 0.20 | Silicon | 0.005 |
| Nickel | 1.00 |
*Maximum, unless range is indicated
Alloy C932 Physical Properties
| Density, lb/in3 | 0.322 |
| Modulus of Elasticity, psi | 14,500 |
| Coefficient of Thermal Expansion, 68-212˚F, /˚F | 10 x 10-6 |
| Thermal Conductivity, Btu/ft hr ˚F | 33.6 |
| Specific Heat, Btu/lb ˚F | 0.09 |
| Electrical Resistivity, Microhm-in | 2.8 |
Alloy C932 Mechanical Properties
Mechanical property requirements as specified in ASTM B505
| Yield Strength, min. (ksi) | 20 |
| Tensile Strength, min. (ksi) | 35 |
| Elongation, min. (%) | 10 |
Alloy C932 Standards
| ASTM B505 |
Your Source for Alloy C932
At Double Eagle Alloys, we supply Alloy C932 in long bar, flanges, pipe, sheet, gaskets, fittings and header plugs engineered for these demanding services. Contact our team to learn how Alloy C932 can support long-term performance and reliability.
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Data shown are typical and provided for informational purposes only. Values should not be considered minimums or maximums for specification or final design. Actual product data may vary, and information may be revised without notice.