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R30021 Cobalt vs. EN 1.6554 Steel

R30021 cobalt belongs to the cobalt alloys classification, while EN 1.6554 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is EN 1.6554 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 9.0
17 to 21
Fatigue Strength, MPa 250
380 to 520
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 700
780 to 930
Tensile Strength: Yield (Proof), MPa 500
550 to 790

Thermal Properties

Latent Heat of Fusion, J/g 330
250
Melting Completion (Liquidus), °C 1350
1460
Melting Onset (Solidus), °C 1190
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
40
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.7

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.0
1.7
Embodied Energy, MJ/kg 110
22
Embodied Water, L/kg 520
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
140 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 570
810 to 1650
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
27 to 33
Strength to Weight: Bending, points 21
24 to 27
Thermal Diffusivity, mm2/s 3.8
11
Thermal Shock Resistance, points 21
23 to 27

Alloy Composition

Carbon (C), % 0.2 to 0.35
0.23 to 0.28
Chromium (Cr), % 26 to 29
0.7 to 0.9
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 0 to 3.0
94.6 to 97.3
Manganese (Mn), % 0
0.6 to 0.9
Molybdenum (Mo), % 4.5 to 6.0
0.2 to 0.3
Nickel (Ni), % 2.0 to 3.0
1.0 to 2.0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.5
0 to 0.6
Sulfur (S), % 0
0 to 0.025
Vanadium (V), % 0
0 to 0.030