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R31233 Cobalt vs. EN 1.5681 Steel

R31233 cobalt belongs to the cobalt alloys classification, while EN 1.5681 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is R31233 cobalt and the bottom bar is EN 1.5681 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 17
20
Fatigue Strength, MPa 220
300
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 85
73
Tensile Strength: Ultimate (UTS), MPa 1020
630
Tensile Strength: Yield (Proof), MPa 420
430

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
48
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
9.0

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.9
Embodied Carbon, kg CO2/kg material 8.4
1.9
Embodied Energy, MJ/kg 110
25
Embodied Water, L/kg 480
55

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
110
Resilience: Unit (Modulus of Resilience), kJ/m3 410
490
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 33
22
Strength to Weight: Bending, points 26
21
Thermal Diffusivity, mm2/s 3.2
13
Thermal Shock Resistance, points 25
19

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0.020 to 0.1
0.060 to 0.12
Chromium (Cr), % 23.5 to 27.5
0
Cobalt (Co), % 44.7 to 63.3
0
Iron (Fe), % 1.0 to 5.0
92.9 to 94.9
Manganese (Mn), % 0.1 to 1.5
0.5 to 0.8
Molybdenum (Mo), % 4.0 to 6.0
0
Nickel (Ni), % 7.0 to 11
4.5 to 5.5
Nitrogen (N), % 0.030 to 0.12
0
Phosphorus (P), % 0 to 0.030
0 to 0.020
Silicon (Si), % 0.050 to 1.0
0 to 0.6
Sulfur (S), % 0 to 0.020
0 to 0.020
Tungsten (W), % 1.0 to 3.0
0