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S31730 Stainless Steel vs. R31539 Cobalt

S31730 stainless steel belongs to the iron alloys classification, while R31539 cobalt belongs to the cobalt alloys. They have a modest 23% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is S31730 stainless steel and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 40
13 to 22
Fatigue Strength, MPa 170
310 to 480
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 540
1000 to 1340
Tensile Strength: Yield (Proof), MPa 200
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1430
1360
Melting Onset (Solidus), °C 1390
1290
Specific Heat Capacity, J/kg-K 470
450
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Density, g/cm3 8.0
8.4
Embodied Carbon, kg CO2/kg material 4.6
8.2
Embodied Energy, MJ/kg 63
110
Embodied Water, L/kg 180
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
140 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 99
780 to 2000
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19
33 to 44
Strength to Weight: Bending, points 18
27 to 32
Thermal Shock Resistance, points 12
24 to 32

Alloy Composition

Aluminum (Al), % 0
0.3 to 1.0
Carbon (C), % 0 to 0.030
0 to 0.14
Chromium (Cr), % 17 to 19
26 to 30
Cobalt (Co), % 0
57.7 to 68.7
Copper (Cu), % 4.0 to 5.0
0
Iron (Fe), % 52.4 to 61
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 3.0 to 4.0
5.0 to 7.0
Nickel (Ni), % 15 to 16.5
0 to 1.0
Nitrogen (N), % 0 to 0.045
0 to 0.25
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.010
0