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AISI 420F Stainless Steel vs. R31537 Cobalt

AISI 420F stainless steel belongs to the iron alloys classification, while R31537 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is AISI 420F stainless steel and the bottom bar is R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 18
14 to 23
Fatigue Strength, MPa 270
310 to 480
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
87
Tensile Strength: Ultimate (UTS), MPa 740
1000 to 1340
Tensile Strength: Yield (Proof), MPa 430
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1440
1360
Melting Onset (Solidus), °C 1390
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 25
13
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.1
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.7
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.4
Embodied Carbon, kg CO2/kg material 2.0
8.1
Embodied Energy, MJ/kg 28
110
Embodied Water, L/kg 100
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 480
780 to 1990
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 27
33 to 44
Strength to Weight: Bending, points 23
26 to 32
Thermal Diffusivity, mm2/s 6.8
3.4
Thermal Shock Resistance, points 27
24 to 32

Alloy Composition

Carbon (C), % 0.3 to 0.4
0 to 0.14
Chromium (Cr), % 12 to 14
26 to 30
Cobalt (Co), % 0
58.9 to 69
Iron (Fe), % 82.4 to 87.6
0 to 0.75
Manganese (Mn), % 0 to 1.3
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
5.0 to 7.0
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.060
0
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0.15 to 0.35
0