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R30155 Cobalt vs. 85-silver 15-nickel

R30155 cobalt belongs to the iron alloys classification, while 85-silver 15-nickel belongs to the otherwise unclassified metals. There are 15 material properties with values for both materials. Properties with values for just one material (19, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is 85-silver 15-nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
88
Poisson's Ratio 0.29
0.36
Shear Modulus, GPa 81
32
Tensile Strength: Ultimate (UTS), MPa 850
260 to 470

Thermal Properties

Latent Heat of Fusion, J/g 300
140
Melting Completion (Liquidus), °C 1470
870
Melting Onset (Solidus), °C 1420
960
Specific Heat Capacity, J/kg-K 450
270
Thermal Expansion, µm/m-K 14
18

Otherwise Unclassified Properties

Density, g/cm3 8.5
10

Common Calculations

Stiffness to Weight: Axial, points 14
4.8
Stiffness to Weight: Bending, points 23
14
Strength to Weight: Axial, points 28
7.1 to 13
Strength to Weight: Bending, points 24
8.9 to 13
Thermal Shock Resistance, points 21
12 to 21

Alloy Composition

Carbon (C), % 0.080 to 0.16
0
Chromium (Cr), % 20 to 22.5
0
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
0
Manganese (Mn), % 1.0 to 2.0
0
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
13.8 to 16
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0
Silver (Ag), % 0
84 to 86
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0
Residuals, % 0
0 to 0.2