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R31233 Cobalt vs. EN 1.4618 Stainless Steel

R31233 cobalt belongs to the cobalt alloys classification, while EN 1.4618 stainless steel belongs to the iron alloys. They have a modest 27% of their average alloy composition in common, which, by itself, doesn't mean much. 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 R31233 cobalt and the bottom bar is EN 1.4618 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 17
51
Fatigue Strength, MPa 220
240 to 250
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 85
77
Tensile Strength: Ultimate (UTS), MPa 1020
680 to 700
Tensile Strength: Yield (Proof), MPa 420
250 to 260

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1350
1400
Melting Onset (Solidus), °C 1330
1360
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 12
15
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.7

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.7
Embodied Carbon, kg CO2/kg material 8.4
2.7
Embodied Energy, MJ/kg 110
39
Embodied Water, L/kg 480
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
270 to 280
Resilience: Unit (Modulus of Resilience), kJ/m3 410
160 to 170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 33
24 to 25
Strength to Weight: Bending, points 26
22 to 23
Thermal Diffusivity, mm2/s 3.2
4.0
Thermal Shock Resistance, points 25
15 to 16

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0.020 to 0.1
0 to 0.1
Chromium (Cr), % 23.5 to 27.5
16.5 to 18.5
Cobalt (Co), % 44.7 to 63.3
0
Copper (Cu), % 0
1.0 to 2.5
Iron (Fe), % 1.0 to 5.0
62.7 to 72.5
Manganese (Mn), % 0.1 to 1.5
5.5 to 9.5
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 to 0.15
Phosphorus (P), % 0 to 0.030
0 to 0.070
Silicon (Si), % 0.050 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.010
Tungsten (W), % 1.0 to 3.0
0