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C87500 Brass vs. C90500 Gun Metal

Both C87500 brass and C90500 gun metal are copper alloys. Both are furnished in the as-fabricated (no temper or treatment) condition. They have 84% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is C87500 brass and the bottom bar is C90500 gun metal.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
110
Elongation at Break, % 18
20
Poisson's Ratio 0.33
0.34
Shear Modulus, GPa 42
40
Tensile Strength: Ultimate (UTS), MPa 460
320
Tensile Strength: Yield (Proof), MPa 190
160

Thermal Properties

Latent Heat of Fusion, J/g 260
190
Maximum Temperature: Mechanical, °C 170
170
Melting Completion (Liquidus), °C 920
1000
Melting Onset (Solidus), °C 820
850
Specific Heat Capacity, J/kg-K 410
370
Thermal Conductivity, W/m-K 28
75
Thermal Expansion, µm/m-K 18
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 6.7
11
Electrical Conductivity: Equal Weight (Specific), % IACS 7.3
11

Otherwise Unclassified Properties

Base Metal Price, % relative 27
35
Density, g/cm3 8.3
8.7
Embodied Carbon, kg CO2/kg material 2.7
3.6
Embodied Energy, MJ/kg 44
59
Embodied Water, L/kg 300
390

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 67
54
Resilience: Unit (Modulus of Resilience), kJ/m3 160
110
Stiffness to Weight: Axial, points 7.4
6.9
Stiffness to Weight: Bending, points 19
18
Strength to Weight: Axial, points 16
10
Strength to Weight: Bending, points 16
12
Thermal Diffusivity, mm2/s 8.3
23
Thermal Shock Resistance, points 17
12

Alloy Composition

Aluminum (Al), % 0 to 0.5
0 to 0.0050
Antimony (Sb), % 0
0 to 0.2
Copper (Cu), % 79 to 85
86 to 89
Iron (Fe), % 0
0 to 0.2
Lead (Pb), % 0 to 0.5
0 to 0.3
Nickel (Ni), % 0
0 to 1.0
Phosphorus (P), % 0
0 to 1.5
Silicon (Si), % 3.0 to 5.0
0 to 0.0050
Sulfur (S), % 0
0 to 0.050
Tin (Sn), % 0
9.0 to 11
Zinc (Zn), % 12 to 16
1.0 to 3.0
Residuals, % 0
0 to 0.3