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R30021 Cobalt vs. EN 1.8918 Steel

R30021 cobalt belongs to the cobalt alloys classification, while EN 1.8918 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is EN 1.8918 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 9.0
19
Fatigue Strength, MPa 250
330
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 700
640
Tensile Strength: Yield (Proof), MPa 500
490

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
46
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.6

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
1.7
Embodied Energy, MJ/kg 110
24
Embodied Water, L/kg 520
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
110
Resilience: Unit (Modulus of Resilience), kJ/m3 570
640
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
23
Strength to Weight: Bending, points 21
21
Thermal Diffusivity, mm2/s 3.8
12
Thermal Shock Resistance, points 21
19

Alloy Composition

Aluminum (Al), % 0
0.020 to 0.050
Carbon (C), % 0.2 to 0.35
0 to 0.2
Chromium (Cr), % 26 to 29
0 to 0.3
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0 to 0.7
Iron (Fe), % 0 to 3.0
95.2 to 98.9
Manganese (Mn), % 0
1.1 to 1.7
Molybdenum (Mo), % 4.5 to 6.0
0 to 0.1
Nickel (Ni), % 2.0 to 3.0
0 to 0.8
Niobium (Nb), % 0
0 to 0.050
Nitrogen (N), % 0
0 to 0.025
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 1.5
0 to 0.6
Sulfur (S), % 0
0 to 0.0050
Titanium (Ti), % 0
0 to 0.030
Vanadium (V), % 0
0 to 0.2