Copper Alloys

Cartridge Brass 70%

Application & Characteristics 
Used for spring qualities and superior strength among brass alloys.
Chemical Composition (%)
Cu 70; Zn 30
Physical Properties
Melting Range (°F)1680 – 1750
Density (lbs/in³) 68F0.308
Thermal Expansion (in/in °Fx10 to the power of -6)11.1 (68-572F)
Electrical Resistivity (ohms/cir mil/ft.) 68F37
Mechanical Properties – Temper = A
Tensile Strength (psi x 10³)47
Yield Strength (psi x 10³)16
Elongation ( % )52
HardnessF64(Rockwell)
Mechanical Properties – Temper = H
Tensile Strength (psi x 10³)76
Yield Strength (psi x 10³)63
Elongation ( % )8
HardnessB82(Rockwell)

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