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R31538 Cobalt vs. 85-silver 15-nickel

R31538 cobalt belongs to the cobalt alloys classification, while 85-silver 15-nickel belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is 85-silver 15-nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
88
Poisson's Ratio 0.29
0.36
Shear Modulus, GPa 86
32
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
260 to 470

Thermal Properties

Latent Heat of Fusion, J/g 320
140
Melting Completion (Liquidus), °C 1360
870
Melting Onset (Solidus), °C 1290
960
Specific Heat Capacity, J/kg-K 450
270
Thermal Expansion, µm/m-K 13
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
86
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
75

Otherwise Unclassified Properties

Density, g/cm3 8.4
10

Common Calculations

Stiffness to Weight: Axial, points 15
4.8
Stiffness to Weight: Bending, points 24
14
Strength to Weight: Axial, points 34 to 45
7.1 to 13
Strength to Weight: Bending, points 27 to 32
8.9 to 13
Thermal Shock Resistance, points 25 to 33
12 to 21

Alloy Composition


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Carbon (C), % 0.15 to 0.35
0
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 58.7 to 68.9
0
Iron (Fe), % 0 to 0.75
0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
13.8 to 16
Nitrogen (N), % 0 to 0.25
0
Silicon (Si), % 0 to 1.0
0
Silver (Ag), % 0
84 to 86
Residuals, % 0
0 to 0.2

Comparable Variants