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S31803 Stainless Steel vs. R30006 Cobalt

S31803 stainless steel belongs to the iron alloys classification, while R30006 cobalt belongs to the cobalt alloys. They have a modest 26% of their average alloy composition in common, which, by itself, doesn't mean much. There are 28 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is S31803 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, % 29
1.0
Fatigue Strength, MPa 370
260
Poisson's Ratio 0.27
0.28
Rockwell C Hardness 27
40
Shear Modulus, GPa 80
85
Tensile Strength: Ultimate (UTS), MPa 710
900
Tensile Strength: Yield (Proof), MPa 500
540

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Melting Completion (Liquidus), °C 1450
1400
Melting Onset (Solidus), °C 1400
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
1.7

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.6
Embodied Carbon, kg CO2/kg material 3.6
7.8
Embodied Energy, MJ/kg 49
110
Embodied Water, L/kg 160
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
7.8
Resilience: Unit (Modulus of Resilience), kJ/m3 630
670
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 25
29
Strength to Weight: Bending, points 23
24
Thermal Diffusivity, mm2/s 4.3
3.9
Thermal Shock Resistance, points 20
26

Alloy Composition

Carbon (C), % 0 to 0.030
0.9 to 1.4
Chromium (Cr), % 21 to 23
27 to 32
Cobalt (Co), % 0
48.6 to 68.1
Iron (Fe), % 63.7 to 71.9
0 to 3.0
Manganese (Mn), % 0 to 2.0
0
Molybdenum (Mo), % 2.5 to 3.5
0 to 1.0
Nickel (Ni), % 4.5 to 6.5
0 to 3.0
Nitrogen (N), % 0.080 to 0.2
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.020
0
Tungsten (W), % 0
4.0 to 6.0