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EN 1.8821 Steel vs. R31537 Cobalt

EN 1.8821 steel belongs to the iron alloys classification, while R31537 cobalt belongs to the cobalt 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 EN 1.8821 steel and the bottom bar is R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 25
14 to 23
Fatigue Strength, MPa 280
310 to 480
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
87
Tensile Strength: Ultimate (UTS), MPa 530
1000 to 1340
Tensile Strength: Yield (Proof), MPa 390
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1460
1360
Melting Onset (Solidus), °C 1420
1290
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 49
13
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 1.6
8.1
Embodied Energy, MJ/kg 21
110
Embodied Water, L/kg 48
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 400
780 to 1990
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19
33 to 44
Strength to Weight: Bending, points 19
26 to 32
Thermal Diffusivity, mm2/s 13
3.4
Thermal Shock Resistance, points 16
24 to 32

Alloy Composition

Aluminum (Al), % 0.020 to 0.030
0
Carbon (C), % 0 to 0.14
0 to 0.14
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
58.9 to 69
Iron (Fe), % 96.8 to 99.98
0 to 0.75
Manganese (Mn), % 0 to 1.6
0 to 1.0
Molybdenum (Mo), % 0 to 0.2
5.0 to 7.0
Nickel (Ni), % 0 to 0.5
0 to 1.0
Niobium (Nb), % 0 to 0.050
0
Nitrogen (N), % 0 to 0.015
0 to 0.25
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.010
0
Titanium (Ti), % 0 to 0.050
0
Vanadium (V), % 0 to 0.1
0