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C38500 Bronze vs. C72900 Copper-nickel

Both C38500 bronze and C72900 copper-nickel are copper alloys. They have 58% of their average alloy composition in common.

For each property being compared, the top bar is C38500 bronze and the bottom bar is C72900 copper-nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
120
Elongation at Break, % 17
6.0 to 20
Poisson's Ratio 0.31
0.34
Shear Modulus, GPa 37
45
Shear Strength, MPa 230
540 to 630
Tensile Strength: Ultimate (UTS), MPa 370
870 to 1080
Tensile Strength: Yield (Proof), MPa 130
700 to 920

Thermal Properties

Latent Heat of Fusion, J/g 160
210
Maximum Temperature: Mechanical, °C 110
210
Melting Completion (Liquidus), °C 890
1120
Melting Onset (Solidus), °C 880
950
Specific Heat Capacity, J/kg-K 380
380
Thermal Conductivity, W/m-K 120
29
Thermal Expansion, µm/m-K 21
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 28
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 31
8.0

Otherwise Unclassified Properties

Base Metal Price, % relative 22
39
Density, g/cm3 8.1
8.8
Embodied Carbon, kg CO2/kg material 2.6
4.6
Embodied Energy, MJ/kg 45
72
Embodied Water, L/kg 320
360

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 48
49 to 210
Resilience: Unit (Modulus of Resilience), kJ/m3 78
2030 to 3490
Stiffness to Weight: Axial, points 7.0
7.6
Stiffness to Weight: Bending, points 19
19
Strength to Weight: Axial, points 13
27 to 34
Strength to Weight: Bending, points 14
23 to 27
Thermal Diffusivity, mm2/s 40
8.6
Thermal Shock Resistance, points 12
31 to 38

Alloy Composition

Copper (Cu), % 55 to 59
74.1 to 78
Iron (Fe), % 0 to 0.35
0 to 0.5
Lead (Pb), % 2.5 to 3.5
0 to 0.020
Magnesium (Mg), % 0
0 to 0.15
Manganese (Mn), % 0
0 to 0.3
Nickel (Ni), % 0
14.5 to 15.5
Niobium (Nb), % 0
0 to 0.1
Tin (Sn), % 0
7.5 to 8.5
Zinc (Zn), % 36.7 to 42.5
0 to 0.5
Residuals, % 0
0 to 0.3