C90300 / CDA 903 Tin Bronze Alloys
Chemical Composition :
| Cu%1 | Pb% | Sn% | Zn% | Fe% | P%2 | Ni%3 | Al% | S% | Sb% | Si% | |
|---|---|---|---|---|---|---|---|---|---|---|---|
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Chemical Composition according to ASTM B505/B505M-18
1In determining Cu min., Cu may be calculated as Cu + Ni. 2For continuous castings, P shall be 1.5%, max. 3Ni value includes Co.
Note: Cu + Sum of Named Elements, 99.4% min. Single values represent maximums.
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| 86.00- 89.00 |
0.30 | 7.50- 9.00 |
3.00- 5.00 |
0.20 | 0.05 | 1.00 | 0.005 | 0.05 | 0.20 | 0.005 | |
Machinability :
| Copper Alloy UNS No. | Machinability Rating | Density (lb/in3 at 68 °F) |
|---|---|---|
| C903 | 30 | 0.318 |
Mechanical Properties :
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Mechanical Properties according to ASTM B505/B505M-18
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| Tensile Strength, min | Yield Strength, at .5% Extension Under Load, min | Elongation, in 2 in. or 50 mm min | Brinell Hardness (500 kg load) | Remarks | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| ksi | MPa | ksi | MPa | % | typical BHN | ||||||
| 44 | 303 | 22 | 152 | 18 | 70 | ||||||
Physical Properties :
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Physical Properties provided by CDA
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| US Customary | Metric | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Melting Point – Liquidus | 1832 °F | 1000 °C | |||||||||
| Melting Point – Solidus | 1570 °F | 854 °C | |||||||||
| Density | 0.318 lb/in3 at 68 °F | 8.80 gm/cm3 at 20 °C | |||||||||
| Specific Gravity | 8.8 | 8.8 | |||||||||
| Electrical Conductivity | 12% IACS at 68 °F | 0.069 MegaSiemens/cm at 20 °C | |||||||||
| Thermal Conductivity | 43.2 Btu/sq ft/ft hr/°F at 68 °F | 74.8 W/m at 20 °C | |||||||||
| Coefficient of Thermal Expansion 68-392 | 10 · 10-6 per °F (68-392 °F) | 17.3 · 10-6 per °C (20-200 °C) | |||||||||
| Specific Heat Capacity | 0.09 Btu/lb/°F at 68 °F | 377.1 J/kg at 293 °C | |||||||||
| Modulus of Elasticity in Tension | 14000 ksi | 96527 MPa | |||||||||
| Magnetic Permeability* | |||||||||||