CDA 875 Copper Silicon Bronze Alloys

Casting Standards :

ASTM (B Series) B584
SAE (J Series) J462
Federal (QQ-C- Series) 390

Specification Composition :

Minimum Maximum
Copper (Cu) 79
Lead (Pb) 0.5
Zinc (Zn) 12 16
Aluminum (Al) 0.5
Silicon (Si) 3 5
Copper + Sum of Named Elements 99.5 5

Specification Properties :

Heat Treat ‘F’ Denotes As Cast Heat Treat State Minimum
Tensile Strength (ksi) F 60
Yield Strength (.5% extension under load) (ksi) F 24

Typical Properties :

Heat Treat State Typical
Reduction of Area (%) 20
Modulus of Elasticity (ksi) 15400
Hardness (Brinell) (HB @ 500kg) 115
Machinability (% of free cutting brass) 50
Fatigue Strength (10^8 cycles) (ksi) 22
Impact Strength (Charpy) (ft-lb) 32
Compressive Strength (0.001 in. set/in.) (ksi) 26.5
Compressive Strength (0.010 in. set/in.) (ksi) 43
Compressive Strength (0.100 in. set/in.) (ksi) 75
Creep Strength (0.00001% per hour) (ksi) 28 @ 350F
Melting Range (Liquidus-Solidus)(F) 1510-1683
Coefficient of Thermal Expansion (per F @ 68-400F) 0.0000109
Thermal Conductivity (Btu/sq.ft/ft./hr/F @ 68F) 16
Specific Heat (Btu/lb/F @ 68F) 0.09
Electrical Conductivity (% IACS @ 68F) 6.7
Density (lb/cu.in. @ 68F) 0.299
Pouring Temperature (Light Castings) (F) 1900-2000
Pouring Temperature (Heavy Castings) (F) 1800-1900
Patternmakers Shrinkage (in/ft) 15/64
Drossing Low
Gassing Medium
Fluidity High
Elongation (2 inch gauge length) (%) F 17