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C90500 Gun Metal vs. C68700 Brass

Both C90500 gun metal and C68700 brass are copper alloys. They have 80% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is C90500 gun metal and the bottom bar is C68700 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
110
Poisson's Ratio 0.34
0.32
Shear Modulus, GPa 40
41
Tensile Strength: Ultimate (UTS), MPa 320
390
Tensile Strength: Yield (Proof), MPa 160
140

Thermal Properties

Latent Heat of Fusion, J/g 190
190
Maximum Temperature: Mechanical, °C 170
160
Melting Completion (Liquidus), °C 1000
970
Melting Onset (Solidus), °C 850
930
Specific Heat Capacity, J/kg-K 370
400
Thermal Conductivity, W/m-K 75
100
Thermal Expansion, µm/m-K 18
19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
23
Electrical Conductivity: Equal Weight (Specific), % IACS 11
25

Otherwise Unclassified Properties

Base Metal Price, % relative 35
26
Density, g/cm3 8.7
8.3
Embodied Carbon, kg CO2/kg material 3.6
2.8
Embodied Energy, MJ/kg 59
46
Embodied Water, L/kg 390
340

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 110
90
Stiffness to Weight: Axial, points 6.9
7.3
Stiffness to Weight: Bending, points 18
19
Strength to Weight: Axial, points 10
13
Strength to Weight: Bending, points 12
14
Thermal Diffusivity, mm2/s 23
30
Thermal Shock Resistance, points 12
13

Alloy Composition

Aluminum (Al), % 0 to 0.0050
1.8 to 2.5
Antimony (Sb), % 0 to 0.2
0
Arsenic (As), % 0
0.020 to 0.1
Copper (Cu), % 86 to 89
76 to 79
Iron (Fe), % 0 to 0.2
0 to 0.060
Lead (Pb), % 0 to 0.3
0 to 0.070
Nickel (Ni), % 0 to 1.0
0
Phosphorus (P), % 0 to 1.5
0
Silicon (Si), % 0 to 0.0050
0
Sulfur (S), % 0 to 0.050
0
Tin (Sn), % 9.0 to 11
0
Zinc (Zn), % 1.0 to 3.0
17.8 to 22.2
Residuals, % 0
0 to 0.5