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R31538 Cobalt vs. EN 1.6773 Steel

R31538 cobalt belongs to the cobalt alloys classification, while EN 1.6773 steel belongs to the iron alloys. There are 27 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 EN 1.6773 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 23
11
Fatigue Strength, MPa 310 to 480
560
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
1120
Tensile Strength: Yield (Proof), MPa 580 to 930
910

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1290
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
46
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
8.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
9.2

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.1
1.9
Embodied Energy, MJ/kg 110
26
Embodied Water, L/kg 530
61

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
110
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
2210
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 34 to 45
40
Strength to Weight: Bending, points 27 to 32
30
Thermal Diffusivity, mm2/s 3.5
12
Thermal Shock Resistance, points 25 to 33
33

Alloy Composition

Carbon (C), % 0.15 to 0.35
0.32 to 0.39
Chromium (Cr), % 26 to 30
1.6 to 2.0
Cobalt (Co), % 58.7 to 68.9
0
Iron (Fe), % 0 to 0.75
92 to 93.9
Manganese (Mn), % 0 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 5.0 to 7.0
0.25 to 0.45
Nickel (Ni), % 0 to 1.0
3.6 to 4.1
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0
0 to 0.025