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70Ag-30Ni Alloy vs. R30816 Cobalt

70Ag-30Ni alloy belongs to the otherwise unclassified metals classification, while R30816 cobalt belongs to the cobalt alloys. They have a modest 20% of their average alloy composition in common, which, by itself, doesn't mean much. There are 15 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is 70Ag-30Ni alloy and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
210
Poisson's Ratio 0.35
0.3
Shear Modulus, GPa 39
81
Tensile Strength: Ultimate (UTS), MPa 320 to 530
1020

Thermal Properties

Latent Heat of Fusion, J/g 170
300
Melting Completion (Liquidus), °C 960
1540
Melting Onset (Solidus), °C 960
1460
Specific Heat Capacity, J/kg-K 300
420
Thermal Expansion, µm/m-K 17
12

Otherwise Unclassified Properties

Density, g/cm3 10
9.1

Common Calculations

Stiffness to Weight: Axial, points 5.8
13
Stiffness to Weight: Bending, points 16
22
Strength to Weight: Axial, points 8.8 to 15
31
Strength to Weight: Bending, points 10 to 15
25
Thermal Shock Resistance, points 13 to 21
28

Alloy Composition

Carbon (C), % 0
0.32 to 0.42
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
40 to 49.8
Iron (Fe), % 0
0 to 5.0
Manganese (Mn), % 0
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 28.8 to 31
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Silver (Ag), % 69 to 71
0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5
Residuals, % 0 to 0.2
0