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R31538 Cobalt vs. ASTM B780 Alloy

R31538 cobalt belongs to the cobalt alloys classification, while ASTM B780 alloy belongs to the otherwise unclassified metals. There are 16 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 R31538 cobalt and the bottom bar is ASTM B780 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
83
Elongation at Break, % 13 to 23
1.1 to 9.1
Poisson's Ratio 0.29
0.36
Shear Modulus, GPa 86
30
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
330 to 590

Thermal Properties

Latent Heat of Fusion, J/g 320
140
Specific Heat Capacity, J/kg-K 450
270
Thermal Expansion, µm/m-K 13
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
70 to 76
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
62 to 68

Otherwise Unclassified Properties

Density, g/cm3 8.4
10

Common Calculations

Stiffness to Weight: Axial, points 15
4.5
Stiffness to Weight: Bending, points 24
14
Strength to Weight: Axial, points 34 to 45
9.1 to 16
Strength to Weight: Bending, points 27 to 32
11 to 15
Thermal Shock Resistance, points 25 to 33
16 to 29

Alloy Composition

Cadmium (Cd), % 0
0 to 0.050
Carbon (C), % 0.15 to 0.35
0
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
23.5 to 25.7
Iron (Fe), % 0 to 0.75
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0.35 to 0.65
Nitrogen (N), % 0 to 0.25
0
Silicon (Si), % 0 to 1.0
0
Silver (Ag), % 0
74 to 76
Zinc (Zn), % 0
0 to 0.060

Comparable Variants