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R31233 Cobalt vs. EN 1.4123 Stainless Steel

R31233 cobalt belongs to the cobalt alloys classification, while EN 1.4123 stainless steel belongs to the iron alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is R31233 cobalt and the bottom bar is EN 1.4123 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 85
77
Tensile Strength: Ultimate (UTS), MPa 1020
720 to 810

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1350
1450
Melting Onset (Solidus), °C 1330
1410
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 12
23
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.8

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.7
Embodied Carbon, kg CO2/kg material 8.4
4.2
Embodied Energy, MJ/kg 110
62
Embodied Water, L/kg 480
120

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 33
26 to 29
Strength to Weight: Bending, points 26
23 to 25
Thermal Diffusivity, mm2/s 3.2
6.3
Thermal Shock Resistance, points 25
26 to 29

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0.020 to 0.1
0.35 to 0.5
Chromium (Cr), % 23.5 to 27.5
14 to 16.5
Cobalt (Co), % 44.7 to 63.3
0
Iron (Fe), % 1.0 to 5.0
76.7 to 84.6
Manganese (Mn), % 0.1 to 1.5
0 to 1.0
Molybdenum (Mo), % 4.0 to 6.0
1.0 to 2.5
Nickel (Ni), % 7.0 to 11
0 to 0.5
Nitrogen (N), % 0.030 to 0.12
0.1 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.050 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.030
Tungsten (W), % 1.0 to 3.0
0
Vanadium (V), % 0
0 to 1.5