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AISI 431 Stainless Steel vs. R31233 Cobalt

AISI 431 stainless steel belongs to the iron alloys classification, while R31233 cobalt belongs to the cobalt alloys. They have a modest 22% 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 AISI 431 stainless steel and the bottom bar is R31233 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 15 to 17
17
Fatigue Strength, MPa 430 to 610
220
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
85
Tensile Strength: Ultimate (UTS), MPa 890 to 1380
1020
Tensile Strength: Yield (Proof), MPa 710 to 1040
420

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1510
1350
Melting Onset (Solidus), °C 1450
1330
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 26
12
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.6
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.6
Embodied Carbon, kg CO2/kg material 2.2
8.4
Embodied Energy, MJ/kg 31
110
Embodied Water, L/kg 120
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 180
140
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 2770
410
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 32 to 50
33
Strength to Weight: Bending, points 27 to 36
26
Thermal Diffusivity, mm2/s 7.0
3.2
Thermal Shock Resistance, points 28 to 43
25

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0 to 0.2
0.020 to 0.1
Chromium (Cr), % 15 to 17
23.5 to 27.5
Cobalt (Co), % 0
44.7 to 63.3
Iron (Fe), % 78.2 to 83.8
1.0 to 5.0
Manganese (Mn), % 0 to 1.0
0.1 to 1.5
Molybdenum (Mo), % 0
4.0 to 6.0
Nickel (Ni), % 1.3 to 2.5
7.0 to 11
Nitrogen (N), % 0
0.030 to 0.12
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.0
0.050 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.020
Tungsten (W), % 0
1.0 to 3.0