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C90500 Gun Metal vs. C87200 Bronze

Both C90500 gun metal and C87200 bronze are copper alloys. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a moderately high 91% 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 C90500 gun metal and the bottom bar is C87200 bronze.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
110
Elongation at Break, % 20
30
Poisson's Ratio 0.34
0.34
Shear Modulus, GPa 40
43
Tensile Strength: Ultimate (UTS), MPa 320
380
Tensile Strength: Yield (Proof), MPa 160
170

Thermal Properties

Latent Heat of Fusion, J/g 190
260
Maximum Temperature: Mechanical, °C 170
200
Melting Completion (Liquidus), °C 1000
970
Melting Onset (Solidus), °C 850
860
Specific Heat Capacity, J/kg-K 370
410
Thermal Conductivity, W/m-K 75
28
Thermal Expansion, µm/m-K 18
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
6.0
Electrical Conductivity: Equal Weight (Specific), % IACS 11
6.3

Otherwise Unclassified Properties

Base Metal Price, % relative 35
29
Density, g/cm3 8.7
8.6
Embodied Carbon, kg CO2/kg material 3.6
2.7
Embodied Energy, MJ/kg 59
44
Embodied Water, L/kg 390
310

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 54
93
Resilience: Unit (Modulus of Resilience), kJ/m3 110
130
Stiffness to Weight: Axial, points 6.9
7.4
Stiffness to Weight: Bending, points 18
19
Strength to Weight: Axial, points 10
12
Strength to Weight: Bending, points 12
14
Thermal Diffusivity, mm2/s 23
8.0
Thermal Shock Resistance, points 12
14

Alloy Composition

Aluminum (Al), % 0 to 0.0050
0 to 1.5
Antimony (Sb), % 0 to 0.2
0
Copper (Cu), % 86 to 89
89 to 99
Iron (Fe), % 0 to 0.2
0 to 2.5
Lead (Pb), % 0 to 0.3
0 to 0.5
Manganese (Mn), % 0
0 to 1.5
Nickel (Ni), % 0 to 1.0
0
Phosphorus (P), % 0 to 1.5
0 to 0.5
Silicon (Si), % 0 to 0.0050
1.0 to 5.0
Sulfur (S), % 0 to 0.050
0
Tin (Sn), % 9.0 to 11
0 to 1.0
Zinc (Zn), % 1.0 to 3.0
0 to 5.0
Residuals, % 0 to 0.3
0