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R31233 Cobalt vs. AISI 418 Stainless Steel

R31233 cobalt belongs to the cobalt alloys classification, while AISI 418 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 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 AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 17
17
Fatigue Strength, MPa 220
520
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 85
77
Tensile Strength: Ultimate (UTS), MPa 1020
1100
Tensile Strength: Yield (Proof), MPa 420
850

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1350
1500
Melting Onset (Solidus), °C 1330
1460
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 12
25
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
3.1

Otherwise Unclassified Properties

Density, g/cm3 8.6
8.0
Embodied Carbon, kg CO2/kg material 8.4
2.9
Embodied Energy, MJ/kg 110
41
Embodied Water, L/kg 480
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
170
Resilience: Unit (Modulus of Resilience), kJ/m3 410
1830
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 33
38
Strength to Weight: Bending, points 26
29
Thermal Diffusivity, mm2/s 3.2
6.7
Thermal Shock Resistance, points 25
40

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0.020 to 0.1
0.15 to 0.2
Chromium (Cr), % 23.5 to 27.5
12 to 14
Cobalt (Co), % 44.7 to 63.3
0
Iron (Fe), % 1.0 to 5.0
78.5 to 83.6
Manganese (Mn), % 0.1 to 1.5
0 to 0.5
Molybdenum (Mo), % 4.0 to 6.0
0 to 0.5
Nickel (Ni), % 7.0 to 11
1.8 to 2.2
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
0 to 0.5
Sulfur (S), % 0 to 0.020
0 to 0.030
Tungsten (W), % 1.0 to 3.0
2.5 to 3.5