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C18700 Copper vs. C31400 Bronze

Both C18700 copper and C31400 bronze are copper alloys. They have a moderately high 90% of their average alloy composition in common.

For each property being compared, the top bar is C18700 copper and the bottom bar is C31400 bronze.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
110
Elongation at Break, % 9.0 to 9.6
6.8 to 29
Poisson's Ratio 0.34
0.33
Shear Modulus, GPa 43
42
Shear Strength, MPa 170 to 190
180 to 240
Tensile Strength: Ultimate (UTS), MPa 290 to 330
270 to 420
Tensile Strength: Yield (Proof), MPa 230 to 250
78 to 310

Thermal Properties

Latent Heat of Fusion, J/g 210
200
Maximum Temperature: Mechanical, °C 200
180
Melting Completion (Liquidus), °C 1080
1040
Melting Onset (Solidus), °C 950
1010
Specific Heat Capacity, J/kg-K 380
380
Thermal Conductivity, W/m-K 380
180
Thermal Expansion, µm/m-K 17
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 98
42
Electrical Conductivity: Equal Weight (Specific), % IACS 99
43

Otherwise Unclassified Properties

Base Metal Price, % relative 30
29
Density, g/cm3 9.0
8.8
Embodied Carbon, kg CO2/kg material 2.6
2.6
Embodied Energy, MJ/kg 41
42
Embodied Water, L/kg 310
310

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 29
26 to 59
Resilience: Unit (Modulus of Resilience), kJ/m3 240 to 280
28 to 420
Stiffness to Weight: Axial, points 7.1
7.1
Stiffness to Weight: Bending, points 18
18
Strength to Weight: Axial, points 9.0 to 10
8.7 to 13
Strength to Weight: Bending, points 11 to 12
11 to 14
Thermal Diffusivity, mm2/s 110
54
Thermal Shock Resistance, points 10 to 12
9.6 to 15

Alloy Composition

Copper (Cu), % 98 to 99.2
87.5 to 90.5
Iron (Fe), % 0
0 to 0.1
Lead (Pb), % 0.8 to 1.5
1.3 to 2.5
Nickel (Ni), % 0
0 to 0.7
Zinc (Zn), % 0
5.8 to 11.2
Residuals, % 0
0 to 0.4

Comparable Variants