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S28200 Stainless Steel vs. R31537 Cobalt

S28200 stainless steel belongs to the iron alloys classification, while R31537 cobalt belongs to the cobalt alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 24 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is S28200 stainless steel and the bottom bar is R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 45
14 to 23
Fatigue Strength, MPa 430
310 to 480
Poisson's Ratio 0.28
0.29
Reduction in Area, % 57
13 to 23
Shear Modulus, GPa 77
87
Tensile Strength: Ultimate (UTS), MPa 870
1000 to 1340
Tensile Strength: Yield (Proof), MPa 460
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1380
1360
Melting Onset (Solidus), °C 1330
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Expansion, µm/m-K 18
13

Otherwise Unclassified Properties

Density, g/cm3 7.6
8.4
Embodied Carbon, kg CO2/kg material 2.8
8.1
Embodied Energy, MJ/kg 41
110
Embodied Water, L/kg 160
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 330
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 540
780 to 1990
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 32
33 to 44
Strength to Weight: Bending, points 27
26 to 32
Thermal Shock Resistance, points 17
24 to 32

Alloy Composition

Carbon (C), % 0 to 0.15
0 to 0.14
Chromium (Cr), % 17 to 19
26 to 30
Cobalt (Co), % 0
58.9 to 69
Copper (Cu), % 0.75 to 1.3
0
Iron (Fe), % 57.7 to 64.1
0 to 0.75
Manganese (Mn), % 17 to 19
0 to 1.0
Molybdenum (Mo), % 0.75 to 1.3
5.0 to 7.0
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0.4 to 0.6
0 to 0.25
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0