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R30006 Cobalt vs. S31803 Stainless Steel

R30006 cobalt belongs to the cobalt alloys classification, while S31803 stainless steel belongs to the iron 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 R30006 cobalt and the bottom bar is S31803 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
29
Fatigue Strength, MPa 260
370
Poisson's Ratio 0.28
0.27
Rockwell C Hardness 40
27
Shear Modulus, GPa 85
80
Tensile Strength: Ultimate (UTS), MPa 900
710
Tensile Strength: Yield (Proof), MPa 540
500

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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