C87200 / CDA 872 Copper Silicon Bronze Alloys
Casting Standards :
| ASTM (B Series) | B584 |
| SAE (J Series) | J462 |
| Federal (QQ-C- Series) | 390 |
| Military (Mil-C- Series) | 22229 |
Specification Composition :
| Minimum | Maximum | |
| Copper (Cu) | 89 | |
| Tin (Sn) | 1 | |
| Lead (Pb) | 0.5 | |
| Zinc (Zn) | 5 | |
| Iron (Fe) | 2.5 | |
| Antimony (SB) | 8 | |
| Aluminum (Al) | 1.5 | |
| Manganese (Mn) | 1.5 | |
| Silicon (Si) | 1 | 5 |
Specification Properties :
| Heat Treat ‘F’ Denotes As Cast | Heat Treat State | Minimum |
| Tensile Strength (ksi) | F | 45 |
| Yield Strength (.5% extension under load) (ksi) | F | 18 |
Typical Properties :
| Heat Treat State | Typical | |
| Modulus of Elasticity (ksi) | 15000 | |
| Hardness (Brinell) (HB @ 3000kg) | 85 | |
| Machinability (% of free cutting brass) | 40 | |
| Impact Strength (Izod) (ft-lb) | 33 | |
| Shear Strength (ksi) | 28 | |
| Compressive Strength (0.001 in. set/in.) (ksi) | 18 | |
| Compressive Strength (0.010 in. set/in.) (ksi) | 60 | |
| Melting Range (Liquidus-Solidus)(F) | 1580-1780 | |
| Thermal Conductivity (Btu/sq.ft/ft./hr/F @ 68F) | 16.4 | |
| Specific Heat (Btu/lb/F @ 68F) | 0.09 | |
| Electrical Conductivity (% IACS @ 68F) | 6 | |
| Density (lb/cu.in. @ 68F) | 0.302 | |
| Patternmakers Shrinkage (in/ft) | 1/4 | |
| Drossing | Low | |
| Gassing | High | |
| Fluidity | High | |
| Elongation (2 inch gauge length) (%) | F | 30 |