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642
Bronze 642 (Silicon Aluminum Bronze) Product Guide
Applications | Specifications | Mechanical and Chemical Data | Tolerances
Overview
The bronze alloy of choice when you require a strength and excellent corrosion resistance, but also an ease of machinability. 642 bronze has the highest machinability of any non-leaded bronze, it is also one of the lightest bronzes. Additionally, 642 bronze exhibits good fatigue and anti-galling strengths. Brazing is rated as fair, as are most forms of welding. Soldering and oxyacetylene welding are not recommended. This material is typically used to make bolts, gears, and valves.
Common Trade Names
UNS C64200, CDA 642, C642
Other Resources
Weight Calculator | Mill Test Reports
Products
Applications
- Gears
- Valves
Specifications
ASTM |
|---|
| B150 |
| Physical Properties 642 | |||||
| -HR50 | |||||
|---|---|---|---|---|---|
| Density | 0.278 lb/in3 | ||||
| Ultimate Tensile Strength | 82.6 ksi | ||||
| Yield Tensile Strength | 41.8 ksi | ||||
| Shear Strength | 56 ksi | ||||
| Shear Modulus | 6,100 ksi | ||||
| Hardness Rockwell | Brinell | B87 | 172 | ||||
| Elongation at Break Percentage | 12% | ||||
| Modulus of Elasticity | 16,000 ksi | ||||
| Poisson's Ratio | 0.34 | ||||
| Machinability Percentage | 60% | ||||
| Melting Point | 1,800-1,840 °F | ||||
| Specific Heat | 9.08 x 10^-2 BTU/lb-°F | ||||
| Thermal Conductivity | 312 BTU-in/hr-ft^2-°F | ||||
| Electrical Conductivity | 8% IACS | ||||
|
Chemistry Information
|
|
Element |
Percentage |
| Si | 1.5 - 2.2 |
| Al | 6.3 - 7.6 |
| Cu | 88.2 - 92.2 |
| Zn | 0 - 0.5 |
| Fe | 0 - 0.3 |
| Ni | 0 - 0.25 |
| Sn | 0 - 0.2 |
| As | 0 - 0.15 |
| Mn | 0 - 0.1 |
| Pb | 0 - 0.05 |
| Residual | 0 - 0.5 |
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