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C74400 Nickel Silver vs. R30021 Cobalt

C74400 nickel silver belongs to the copper alloys classification, while R30021 cobalt belongs to the cobalt alloys. There are 26 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is C74400 nickel silver and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
220
Elongation at Break, % 43
9.0
Poisson's Ratio 0.31
0.29
Shear Modulus, GPa 39
86
Tensile Strength: Ultimate (UTS), MPa 350
700
Tensile Strength: Yield (Proof), MPa 120
500

Thermal Properties

Latent Heat of Fusion, J/g 180
330
Melting Completion (Liquidus), °C 930
1350
Melting Onset (Solidus), °C 910
1190
Specific Heat Capacity, J/kg-K 390
450
Thermal Conductivity, W/m-K 120
15
Thermal Expansion, µm/m-K 20
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 29
2.1

Otherwise Unclassified Properties

Density, g/cm3 8.2
8.4
Embodied Carbon, kg CO2/kg material 2.9
8.0
Embodied Energy, MJ/kg 48
110
Embodied Water, L/kg 320
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
57
Resilience: Unit (Modulus of Resilience), kJ/m3 63
570
Stiffness to Weight: Axial, points 7.4
15
Stiffness to Weight: Bending, points 19
24
Strength to Weight: Axial, points 12
23
Strength to Weight: Bending, points 14
21
Thermal Diffusivity, mm2/s 37
3.8
Thermal Shock Resistance, points 12
21

Alloy Composition

Carbon (C), % 0
0.2 to 0.35
Chromium (Cr), % 0
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 62 to 66
0
Iron (Fe), % 0 to 0.050
0 to 3.0
Lead (Pb), % 0 to 0.050
0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 2.0 to 4.0
2.0 to 3.0
Silicon (Si), % 0
0 to 1.5
Zinc (Zn), % 29.6 to 36
0
Residuals, % 0 to 0.3
0