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R31233 Cobalt vs. EN 1.8821 Steel

R31233 cobalt belongs to the cobalt alloys classification, while EN 1.8821 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is R31233 cobalt and the bottom bar is EN 1.8821 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 17
25
Fatigue Strength, MPa 220
280
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 85
73
Tensile Strength: Ultimate (UTS), MPa 1020
530
Tensile Strength: Yield (Proof), MPa 420
390

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1350
1460
Melting Onset (Solidus), °C 1330
1420
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 12
49
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.3

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.8
Embodied Carbon, kg CO2/kg material 8.4
1.6
Embodied Energy, MJ/kg 110
21
Embodied Water, L/kg 480
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
120
Resilience: Unit (Modulus of Resilience), kJ/m3 410
400
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 33
19
Strength to Weight: Bending, points 26
19
Thermal Diffusivity, mm2/s 3.2
13
Thermal Shock Resistance, points 25
16

Alloy Composition

Aluminum (Al), % 0
0.020 to 0.030
Boron (B), % 0 to 0.015
0
Carbon (C), % 0.020 to 0.1
0 to 0.14
Chromium (Cr), % 23.5 to 27.5
0
Cobalt (Co), % 44.7 to 63.3
0
Iron (Fe), % 1.0 to 5.0
96.8 to 99.98
Manganese (Mn), % 0.1 to 1.5
0 to 1.6
Molybdenum (Mo), % 4.0 to 6.0
0 to 0.2
Nickel (Ni), % 7.0 to 11
0 to 0.5
Niobium (Nb), % 0
0 to 0.050
Nitrogen (N), % 0.030 to 0.12
0 to 0.015
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0.050 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.020
0 to 0.010
Titanium (Ti), % 0
0 to 0.050
Tungsten (W), % 1.0 to 3.0
0
Vanadium (V), % 0
0 to 0.1