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R31233 Cobalt vs. EN 1.4986 Stainless Steel

R31233 cobalt belongs to the cobalt alloys classification, while EN 1.4986 stainless steel belongs to the iron alloys. They have a modest 32% 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 1.4986 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 17
18
Fatigue Strength, MPa 220
350
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 85
77
Tensile Strength: Ultimate (UTS), MPa 1020
750
Tensile Strength: Yield (Proof), MPa 420
560

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1350
1450
Melting Onset (Solidus), °C 1330
1400
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 12
15
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.6

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.9
Embodied Carbon, kg CO2/kg material 8.4
4.8
Embodied Energy, MJ/kg 110
67
Embodied Water, L/kg 480
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
120
Resilience: Unit (Modulus of Resilience), kJ/m3 410
790
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 33
26
Strength to Weight: Bending, points 26
23
Thermal Diffusivity, mm2/s 3.2
4.0
Thermal Shock Resistance, points 25
16

Alloy Composition

Boron (B), % 0 to 0.015
0.050 to 0.1
Carbon (C), % 0.020 to 0.1
0.040 to 0.1
Chromium (Cr), % 23.5 to 27.5
15.5 to 17.5
Cobalt (Co), % 44.7 to 63.3
0
Iron (Fe), % 1.0 to 5.0
59.4 to 66.6
Manganese (Mn), % 0.1 to 1.5
0 to 1.5
Molybdenum (Mo), % 4.0 to 6.0
1.6 to 2.0
Nickel (Ni), % 7.0 to 11
15.5 to 17.5
Niobium (Nb), % 0
0.4 to 1.2
Nitrogen (N), % 0.030 to 0.12
0
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.050 to 1.0
0.3 to 0.6
Sulfur (S), % 0 to 0.020
0 to 0.030
Tungsten (W), % 1.0 to 3.0
0