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S43940 Stainless Steel vs. R30006 Cobalt

S43940 stainless steel belongs to the iron alloys classification, while R30006 cobalt belongs to the cobalt alloys. They have a modest 20% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is S43940 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, % 21
1.0
Fatigue Strength, MPa 180
260
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
85
Tensile Strength: Ultimate (UTS), MPa 490
900
Tensile Strength: Yield (Proof), MPa 280
540

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1440
1400
Melting Onset (Solidus), °C 1400
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 25
15
Thermal Expansion, µm/m-K 10
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 3.4
1.7

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.6
Embodied Carbon, kg CO2/kg material 2.6
7.8
Embodied Energy, MJ/kg 38
110
Embodied Water, L/kg 120
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 86
7.8
Resilience: Unit (Modulus of Resilience), kJ/m3 200
670
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 18
29
Strength to Weight: Bending, points 18
24
Thermal Diffusivity, mm2/s 6.8
3.9
Thermal Shock Resistance, points 18
26

Alloy Composition

Carbon (C), % 0 to 0.030
0.9 to 1.4
Chromium (Cr), % 17.5 to 18.5
27 to 32
Cobalt (Co), % 0
48.6 to 68.1
Iron (Fe), % 78.2 to 82.1
0 to 3.0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0
0 to 3.0
Niobium (Nb), % 0.3 to 0.6
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.015
0
Titanium (Ti), % 0.1 to 0.6
0
Tungsten (W), % 0
4.0 to 6.0