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S31730 Stainless Steel vs. R30016 Cobalt

S31730 stainless steel belongs to the iron alloys classification, while R30016 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 (16, in this case) are not shown.

For each property being compared, the top bar is S31730 stainless steel and the bottom bar is R30016 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 40
8.4
Fatigue Strength, MPa 170
290
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
85
Tensile Strength: Ultimate (UTS), MPa 540
1010
Tensile Strength: Yield (Proof), MPa 200
580

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1430
1360
Melting Onset (Solidus), °C 1390
1270
Specific Heat Capacity, J/kg-K 470
450
Thermal Expansion, µm/m-K 16
14

Otherwise Unclassified Properties

Density, g/cm3 8.0
8.5
Embodied Carbon, kg CO2/kg material 4.6
7.7
Embodied Energy, MJ/kg 63
110
Embodied Water, L/kg 180
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
72
Resilience: Unit (Modulus of Resilience), kJ/m3 99
770
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19
33
Strength to Weight: Bending, points 18
26
Thermal Shock Resistance, points 12
24

Alloy Composition

Carbon (C), % 0 to 0.030
0.9 to 1.4
Chromium (Cr), % 17 to 19
28 to 32
Cobalt (Co), % 0
49.6 to 66.9
Copper (Cu), % 4.0 to 5.0
0
Iron (Fe), % 52.4 to 61
0 to 3.0
Manganese (Mn), % 0 to 2.0
0.5 to 2.0
Molybdenum (Mo), % 3.0 to 4.0
0 to 1.5
Nickel (Ni), % 15 to 16.5
0 to 3.0
Nitrogen (N), % 0 to 0.045
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0.2 to 2.0
Sulfur (S), % 0 to 0.010
0
Tungsten (W), % 0
3.5 to 5.5