Copper Alloy No. C92500
Copper Alloy No. C92500
Leaded Tin Bronze SAE 640 , CDA 925 ASTM B 505
Chemical Composition % by weight
Leaded Tin Bronze SAE 640 , CDA 925 ASTM B 505
Chemical Composition % by weight
| Element | Nominal | Minimum | Maximum |
| Aluminum | - | - | .005 |
| Antimony | - | - | .25 |
| Copper | 87 | 85 | 88 |
| Iron | - | - | .30 |
| Lead | 1 | 1 | 1.5 |
| Nickel | 1 | .8 | 1.5 |
| Phosphorus | - | - | .30 |
| Silicon | - | - | .005 |
| Sulfur | - | - | .05 |
| Tin | 11 | 10 | 12 |
| Zinc | - | - | .50 |
Applications
Gears, automotive synchronizer rings.
Mechanical Properties
M07 - As Continuous Cast
| Hardness* | Brinell Hardness (500 kg load) | 80 |
| Tensile Strength** | KSI | 38 min |
| Yield Strength ** | KSI (0.5% Ext. under load) | 24 min |
| Elongation** | % in 2 inch | 10 min |
**Test values are nominal approximations and depend on specimen size and orientation.
Physical Properties
| Thermal Conductivity | BTU/ (sq ft-ft-hr-F) | N/A |
| Specific Heat | BTU/lb/ºF @ 68F | .09 |
| Thermal Expansion | Per °F from 68 F to 350 F | N/A |
| Density | lb/cu in @ 68 F | .317 |
| Electrical Conductivity* (Annealed) | % IACS @ 68 F | 12 |
| Modulus of Elasticity | KSI | 16,000 |
*Volume basis
Fabrication Practices
| Stress relieving temperature | 500 F or 260 C |
| Time at temperature | 1 hour per inch of section thickness |
| Responds to heat treatment | No |
| Machinability rating (Free Cutting Brass=100) | 30 |
| Suitability for being joined by: | Soldering/Excellent |
| Brazing/Good* | |
| Oxyacetylene Welding/Not Recommended | |
| Gas Shielded Arc Welding/Not Recommended | |
| Coated Metal Arc Welding/Not Recommended |