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UNS C99750
Category Copper Alloy
Class Cast
Type Special alloy
Designations United States: UNS C99750

Composition
ElementWeight %
Cu  58 
Al  1 
Pb  1 
Mn  20 
Zn  20 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 8.8-8.94 25  
Poisson's Ratio 0.34 25  
Elastic Modulus (GPa) 117 25  
Tensile Strength (Mpa) 448 (517)  25  (castings: die, investment, permanent mold, plaster, sand) 
Yield Strength (Mpa) 221 (276) 
Elongation (%) 30 (20) 
Reduction in Area (%)  
Note: Values in parentheses indicate responses to heat treatment
Hardness (HRB) 77 (82)  25  (as cast) 
Note: Value in parentheses indicates response to heat treatment.
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