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C85400 Brass vs. C90500 Gun Metal

Both C85400 brass and C90500 gun metal are copper alloys. Both are furnished in the as-fabricated (no temper or treatment) condition. They have 71% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is C85400 brass and the bottom bar is C90500 gun metal.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
110
Elongation at Break, % 23
20
Poisson's Ratio 0.32
0.34
Shear Modulus, GPa 40
40
Tensile Strength: Ultimate (UTS), MPa 220
320
Tensile Strength: Yield (Proof), MPa 85
160

Thermal Properties

Latent Heat of Fusion, J/g 180
190
Maximum Temperature: Mechanical, °C 130
170
Melting Completion (Liquidus), °C 940
1000
Melting Onset (Solidus), °C 940
850
Specific Heat Capacity, J/kg-K 380
370
Thermal Conductivity, W/m-K 89
75
Thermal Expansion, µm/m-K 20
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 20
11
Electrical Conductivity: Equal Weight (Specific), % IACS 22
11

Otherwise Unclassified Properties

Base Metal Price, % relative 25
35
Density, g/cm3 8.3
8.7
Embodied Carbon, kg CO2/kg material 2.8
3.6
Embodied Energy, MJ/kg 46
59
Embodied Water, L/kg 330
390

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 40
54
Resilience: Unit (Modulus of Resilience), kJ/m3 35
110
Stiffness to Weight: Axial, points 7.0
6.9
Stiffness to Weight: Bending, points 19
18
Strength to Weight: Axial, points 7.5
10
Strength to Weight: Bending, points 9.9
12
Thermal Diffusivity, mm2/s 28
23
Thermal Shock Resistance, points 7.6
12

Alloy Composition

Aluminum (Al), % 0 to 0.35
0 to 0.0050
Antimony (Sb), % 0
0 to 0.2
Copper (Cu), % 65 to 70
86 to 89
Iron (Fe), % 0 to 0.7
0 to 0.2
Lead (Pb), % 1.5 to 3.8
0 to 0.3
Nickel (Ni), % 0 to 1.0
0 to 1.0
Phosphorus (P), % 0
0 to 1.5
Silicon (Si), % 0 to 0.050
0 to 0.0050
Sulfur (S), % 0
0 to 0.050
Tin (Sn), % 0.5 to 1.5
9.0 to 11
Zinc (Zn), % 24 to 32
1.0 to 3.0
Residuals, % 0
0 to 0.3