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C71640 Copper-nickel vs. AISI 431 Stainless Steel

C71640 copper-nickel belongs to the copper alloys classification, while AISI 431 stainless steel belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is C71640 copper-nickel and the bottom bar is AISI 431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
200
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 52
77
Tensile Strength: Ultimate (UTS), MPa 490 to 630
890 to 1380
Tensile Strength: Yield (Proof), MPa 190 to 460
710 to 1040

Thermal Properties

Latent Heat of Fusion, J/g 240
280
Maximum Temperature: Mechanical, °C 260
850
Melting Completion (Liquidus), °C 1180
1510
Melting Onset (Solidus), °C 1120
1450
Specific Heat Capacity, J/kg-K 410
480
Thermal Conductivity, W/m-K 29
26
Thermal Expansion, µm/m-K 15
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 40
9.0
Density, g/cm3 8.9
7.7
Embodied Carbon, kg CO2/kg material 5.0
2.2
Embodied Energy, MJ/kg 73
31
Embodied Water, L/kg 280
120

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 750
1270 to 2770
Stiffness to Weight: Axial, points 8.7
14
Stiffness to Weight: Bending, points 20
25
Strength to Weight: Axial, points 15 to 20
32 to 50
Strength to Weight: Bending, points 16 to 18
27 to 36
Thermal Diffusivity, mm2/s 8.2
7.0
Thermal Shock Resistance, points 16 to 21
28 to 43

Alloy Composition

Carbon (C), % 0
0 to 0.2
Chromium (Cr), % 0
15 to 17
Copper (Cu), % 61.7 to 67.8
0
Iron (Fe), % 1.7 to 2.3
78.2 to 83.8
Lead (Pb), % 0 to 0.050
0
Manganese (Mn), % 1.5 to 2.5
0 to 1.0
Nickel (Ni), % 29 to 32
1.3 to 2.5
Phosphorus (P), % 0
0 to 0.040
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