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R31538 Cobalt vs. R60705 Alloy

R31538 cobalt belongs to the cobalt alloys classification, while R60705 alloy belongs to the otherwise unclassified metals. There are 21 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is R60705 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
98
Elongation at Break, % 13 to 23
18
Fatigue Strength, MPa 310 to 480
290
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 86
37
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
540
Tensile Strength: Yield (Proof), MPa 580 to 930
430

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Specific Heat Capacity, J/kg-K 450
270
Thermal Conductivity, W/m-K 13
17
Thermal Expansion, µm/m-K 13
6.3

Otherwise Unclassified Properties

Density, g/cm3 8.4
6.7
Embodied Water, L/kg 530
450

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
90
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
950
Stiffness to Weight: Axial, points 15
8.1
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 34 to 45
22
Strength to Weight: Bending, points 27 to 32
22
Thermal Diffusivity, mm2/s 3.5
9.5
Thermal Shock Resistance, points 25 to 33
63

Alloy Composition

Carbon (C), % 0.15 to 0.35
0 to 0.050
Chromium (Cr), % 26 to 30
0 to 0.2
Cobalt (Co), % 58.7 to 68.9
0
Hafnium (Hf), % 0
0 to 4.5
Hydrogen (H), % 0
0 to 0.0050
Iron (Fe), % 0 to 0.75
0 to 0.2
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0
Niobium (Nb), % 0
2.0 to 3.0
Nitrogen (N), % 0 to 0.25
0 to 0.025
Oxygen (O), % 0
0 to 0.18
Silicon (Si), % 0 to 1.0
0
Zirconium (Zr), % 0
91 to 98