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R31233 Cobalt vs. EN 1.4658 Stainless Steel

R31233 cobalt belongs to the cobalt alloys classification, while EN 1.4658 stainless steel belongs to the iron alloys. They have 43% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R31233 cobalt and the bottom bar is EN 1.4658 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 17
28
Fatigue Strength, MPa 220
530
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 85
81
Tensile Strength: Ultimate (UTS), MPa 1020
900
Tensile Strength: Yield (Proof), MPa 420
730

Thermal Properties

Latent Heat of Fusion, J/g 320
300
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
16
Thermal Expansion, µm/m-K 13
13

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.8
Embodied Carbon, kg CO2/kg material 8.4
4.5
Embodied Energy, MJ/kg 110
61
Embodied Water, L/kg 480
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
240
Resilience: Unit (Modulus of Resilience), kJ/m3 410
1280
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 33
32
Strength to Weight: Bending, points 26
26
Thermal Diffusivity, mm2/s 3.2
4.3
Thermal Shock Resistance, points 25
24

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0.020 to 0.1
0 to 0.030
Chromium (Cr), % 23.5 to 27.5
26 to 29
Cobalt (Co), % 44.7 to 63.3
0.5 to 2.0
Copper (Cu), % 0
0 to 1.0
Iron (Fe), % 1.0 to 5.0
50.9 to 63.7
Manganese (Mn), % 0.1 to 1.5
0 to 1.5
Molybdenum (Mo), % 4.0 to 6.0
4.0 to 5.0
Nickel (Ni), % 7.0 to 11
5.5 to 9.5
Nitrogen (N), % 0.030 to 0.12
0.3 to 0.5
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0.050 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.020
0 to 0.010
Tungsten (W), % 1.0 to 3.0
0