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R31233 Cobalt vs. EN 1.4740 Stainless Steel

R31233 cobalt belongs to the cobalt alloys classification, while EN 1.4740 stainless steel belongs to the iron alloys. They have a modest 22% of their average alloy composition in common, which, by itself, doesn't mean much. There are 19 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is R31233 cobalt and the bottom bar is EN 1.4740 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 17
22
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 85
77

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1350
1420
Melting Onset (Solidus), °C 1330
1370
Specific Heat Capacity, J/kg-K 440
490
Thermal Conductivity, W/m-K 12
18
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.6

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.6
Embodied Carbon, kg CO2/kg material 8.4
2.3
Embodied Energy, MJ/kg 110
32
Embodied Water, L/kg 480
120

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Thermal Diffusivity, mm2/s 3.2
4.8

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0.020 to 0.1
0.3 to 0.5
Chromium (Cr), % 23.5 to 27.5
16 to 19
Cobalt (Co), % 44.7 to 63.3
0
Iron (Fe), % 1.0 to 5.0
75.4 to 82.7
Manganese (Mn), % 0.1 to 1.5
0 to 1.0
Molybdenum (Mo), % 4.0 to 6.0
0 to 0.5
Nickel (Ni), % 7.0 to 11
0 to 1.0
Nitrogen (N), % 0.030 to 0.12
0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.050 to 1.0
1.0 to 2.5
Sulfur (S), % 0 to 0.020
0 to 0.030
Tungsten (W), % 1.0 to 3.0
0