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R31538 Cobalt vs. R05255 Alloy

R31538 cobalt belongs to the cobalt alloys classification, while R05255 alloy belongs to the otherwise unclassified metals. There are 20 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is R05255 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 23
20
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 86
70
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
540
Tensile Strength: Yield (Proof), MPa 580 to 930
450

Thermal Properties

Latent Heat of Fusion, J/g 320
140
Specific Heat Capacity, J/kg-K 450
140
Thermal Conductivity, W/m-K 13
59
Thermal Expansion, µm/m-K 13
6.6

Otherwise Unclassified Properties

Density, g/cm3 8.4
17
Embodied Water, L/kg 530
630

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
100
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
530
Stiffness to Weight: Axial, points 15
6.3
Stiffness to Weight: Bending, points 24
11
Strength to Weight: Axial, points 34 to 45
9.1
Strength to Weight: Bending, points 27 to 32
8.9
Thermal Diffusivity, mm2/s 3.5
25
Thermal Shock Resistance, points 25 to 33
31

Alloy Composition

Carbon (C), % 0.15 to 0.35
0 to 0.010
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 58.7 to 68.9
0
Hydrogen (H), % 0
0 to 0.0015
Iron (Fe), % 0 to 0.75
0 to 0.010
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 5.0 to 7.0
0 to 0.020
Nickel (Ni), % 0 to 1.0
0 to 0.010
Niobium (Nb), % 0
0 to 0.5
Nitrogen (N), % 0 to 0.25
0 to 0.010
Oxygen (O), % 0
0 to 0.015
Silicon (Si), % 0 to 1.0
0 to 0.0050
Tantalum (Ta), % 0
95.9 to 98
Titanium (Ti), % 0
0 to 0.010
Tungsten (W), % 0
2.0 to 3.5