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C71000 Copper-nickel vs. S21904 Stainless Steel

C71000 copper-nickel belongs to the copper alloys classification, while S21904 stainless steel belongs to the iron alloys. There are 24 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is C71000 copper-nickel and the bottom bar is S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 130
200
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 49
78
Tensile Strength: Ultimate (UTS), MPa 320 to 560
700 to 1000

Thermal Properties

Latent Heat of Fusion, J/g 230
290
Maximum Temperature: Mechanical, °C 240
980
Melting Completion (Liquidus), °C 1200
1400
Melting Onset (Solidus), °C 1150
1350
Specific Heat Capacity, J/kg-K 400
480
Thermal Conductivity, W/m-K 43
14
Thermal Expansion, µm/m-K 15
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 6.5
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 6.6
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 37
15
Density, g/cm3 8.9
7.7
Embodied Carbon, kg CO2/kg material 4.3
3.0
Embodied Energy, MJ/kg 63
43
Embodied Water, L/kg 290
160

Common Calculations

Stiffness to Weight: Axial, points 8.2
14
Stiffness to Weight: Bending, points 19
25
Strength to Weight: Axial, points 10 to 18
25 to 36
Strength to Weight: Bending, points 12 to 17
23 to 29
Thermal Diffusivity, mm2/s 12
3.8
Thermal Shock Resistance, points 12 to 20
15 to 21

Alloy Composition

Carbon (C), % 0
0 to 0.040
Chromium (Cr), % 0
19 to 21.5
Copper (Cu), % 73.5 to 80.5
0
Iron (Fe), % 0.5 to 1.0
59.5 to 67.4
Lead (Pb), % 0 to 0.050
0
Manganese (Mn), % 0 to 1.0
8.0 to 10
Nickel (Ni), % 19 to 23
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0 to 1.0
0
Residuals, % 0 to 0.5
0