Bronze Alloy Selection
23 October
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Leaded Bronze SAE660 / 932
Key Features
- Excellent machining properties
- Medium Strength
- Good Bearing Properties
- Good Pressure Tightness
- Not subject to Dezincification
- Reasonable corrosion resistance to seawater
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Key Features
- Excellent machining properties
- Medium Strength
- Good Bearing Properties
- Good Pressure Tightness
- Not subject to Dezincification
- Reasonable corrosion resistance to seawater
Overview:
Leaded Bronze C93200 or SAE 660 is a general purpose leaded tin bronze bearing and bushing material. It has excellent machining properties, good hardness, strength and wear resistance with excellent anti-frictional qualities. The alloy is not subject to dezincification and has reasonable corrosion resistance to sea water and brine making it suitable for pump and valve components. 932 is suitable for bearings having medium loads and speeds with adequate lubrications.
The composition of 932 is strictly controlled as are the casting conditions. All Kormax bronze is manufactured using finely controlled continuous or centrifugal casting techniques to ensure that hardness and strength is superior to sand-casting methods. This also means that the material has a fine grain structure and is free from porosity.
Chemical Composition
| Element | Symbol | Range (%) | Nominal (%) |
| Tin | Sn | 6.3 – 7.5 | 7.0 |
| Lead | Pb | 6.0 – 8.0 | 7.0 |
| Zinc | Zn | 2.0 – 4.0 | 3.0 |
| Nickel | Ni | 1.0 maximum | |
| Iron | Fe | 0.20 maximum | |
| Aluminium | Al | 0.005 maximum | |
| Antimony | Sb | 0.35 maximum | |
| Phosphorus | P | 0.15 maximum | |
| Copper | Cu | Balance |
Physical Properties
| Material | Unit | Leaded Bronze 932 |
| Tensile Strength Min | N/mm2 | 240 |
| Yield Strength Min | N/mm2 | 135 |
| Elongation Min | % | 20% |
| Hardness Min | BHN | 60 |
Machining Allowances:
All Kormax LG2 Bronze bar has machining allowances added to the sizes quoted. To use 4-1/2” x 2-1/2” hollow bar as an example, this material would measure approximately 4.570” OD x 2.440” ID as supplied (see table below). Therefore this allows finished components measuring 4-1/2” OD x 2-1/2” ID to be easily manufactured from 4-1/2” x 2-1/2” hollow bar.
| Outside Diameter | Inside Diameter | ||
| Size Range | Allowance | Size Range | Allowance |
| up to 3-3/4” | +0.040” | up to 3-3/4” | -0.060” |
| 4” to 5” | +0.070” | 4” to 5” | -0.090” |
| 5-1/4” to 6” | +0.094” | 5-1/4” to 6” | -0.108” |
| 6-1/4” to 18” | +0.109” | 6-1/4” to 18” | -0.120” |
Comparative Specifications
AS1565 C93200; ASTM B505, B271 – C93200; SAE 660