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S31730 Stainless Steel vs. R30006 Cobalt

S31730 stainless steel belongs to the iron alloys classification, while R30006 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 23 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is S31730 stainless steel and the bottom bar is R30006 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 40
1.0
Fatigue Strength, MPa 170
260
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
85
Tensile Strength: Ultimate (UTS), MPa 540
900
Tensile Strength: Yield (Proof), MPa 200
540

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1430
1400
Melting Onset (Solidus), °C 1390
1290
Specific Heat Capacity, J/kg-K 470
450
Thermal Expansion, µm/m-K 16
11

Otherwise Unclassified Properties

Density, g/cm3 8.0
8.6
Embodied Carbon, kg CO2/kg material 4.6
7.8
Embodied Energy, MJ/kg 63
110
Embodied Water, L/kg 180
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
7.8
Resilience: Unit (Modulus of Resilience), kJ/m3 99
670
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 19
29
Strength to Weight: Bending, points 18
24
Thermal Shock Resistance, points 12
26

Alloy Composition

Carbon (C), % 0 to 0.030
0.9 to 1.4
Chromium (Cr), % 17 to 19
27 to 32
Cobalt (Co), % 0
48.6 to 68.1
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
Molybdenum (Mo), % 3.0 to 4.0
0 to 1.0
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 to 2.0
Sulfur (S), % 0 to 0.010
0
Tungsten (W), % 0
4.0 to 6.0