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