C93200 bronze is primarily composed of copper, tin, lead, zinc, iron, nickel, antimony, phosphorus, sulfur, aluminum, and silicon. The lead content is between 6 and 15%, and due to its heavy use in bearing applications, is also known as leaded tin bronze or bearing bronze. A general-purpose bearing alloy, C93200 bronze boasts good anti-friction properties, high strength and hardness, excellent machinability, and good ductility.
C932 leaded tin bronze has a wide range of application potentials, but is primarily used in bearing materials such as sprockets, impellers, automotive fittings and washers, bushings, and light-duty gears. Beyond bearings, it is also used extensively in cylinders, pumps, machine tools, and earth-moving machinery due to its resistance to brine and corrosion.
| Property | Value | Notes |
|---|---|---|
| Material Type | High-Leaded Tin Bronze | UNS C93200; SAE 660 |
| Composition | Cu ~81–85%, Sn ~6–8%, Pb ~6–7%, Zn ~2–4% | Lead improves machinability and embeddability |
| Density | ~8.8 g/cm³ | ~0.318 lb/in³ |
| Melting Range | ~850–1,025°C | ~1,560–1,880°F |
| Hardness (Brinell) | ~65–85 HB | Varies slightly with temper |
| Tensile Strength | ~210–275 MPa | ~30,000–40,000 psi |
| Yield Strength | ~90–120 MPa | ~13,000–17,000 psi |
| Elongation at Break | ~10–20% | Good ductility for load-bearing service |
| Modulus of Elasticity | ~100 GPa | ~14.5 x 10⁶ psi |
| Thermal Conductivity | ~60–75 W/m·K | Good heat dissipation for bearings |
| Corrosion Resistance | Good | Suitable for most lubricated and dry bearing environments |
| Friction Characteristics | Excellent | Self-lubricating under certain conditions |
| Machinability | Excellent | Very free-machining due to lead content |
| Weldability | Fair | Best to avoid welding; brazing preferred |
| Applications | Bearings, bushings, washers, thrust surfaces | Especially under medium loads and speeds |
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