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C71640 Copper-nickel vs. C68700 Brass

Both C71640 copper-nickel and C68700 brass are copper alloys. They have 66% of their average alloy composition in common.

For each property being compared, the top bar is C71640 copper-nickel and the bottom bar is C68700 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
110
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 52
41
Tensile Strength: Ultimate (UTS), MPa 490 to 630
390
Tensile Strength: Yield (Proof), MPa 190 to 460
140

Thermal Properties

Latent Heat of Fusion, J/g 240
190
Maximum Temperature: Mechanical, °C 260
160
Melting Completion (Liquidus), °C 1180
970
Melting Onset (Solidus), °C 1120
930
Specific Heat Capacity, J/kg-K 410
400
Thermal Conductivity, W/m-K 29
100
Thermal Expansion, µm/m-K 15
19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
23
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
25

Otherwise Unclassified Properties

Base Metal Price, % relative 40
26
Density, g/cm3 8.9
8.3
Embodied Carbon, kg CO2/kg material 5.0
2.8
Embodied Energy, MJ/kg 73
46
Embodied Water, L/kg 280
340

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 750
90
Stiffness to Weight: Axial, points 8.7
7.3
Stiffness to Weight: Bending, points 20
19
Strength to Weight: Axial, points 15 to 20
13
Strength to Weight: Bending, points 16 to 18
14
Thermal Diffusivity, mm2/s 8.2
30
Thermal Shock Resistance, points 16 to 21
13

Alloy Composition


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Aluminum (Al), % 0
1.8 to 2.5
Arsenic (As), % 0
0.020 to 0.1
Copper (Cu), % 61.7 to 67.8
76 to 79
Iron (Fe), % 1.7 to 2.3
0 to 0.060
Lead (Pb), % 0 to 0.050
0 to 0.070
Manganese (Mn), % 1.5 to 2.5
0
Nickel (Ni), % 29 to 32
0
Zinc (Zn), % 0 to 1.0
17.8 to 22.2
Residuals, % 0 to 0.5
0 to 0.5