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S21640 Stainless Steel vs. R30006 Cobalt

S21640 stainless steel belongs to the iron alloys classification, while R30006 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 27 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 S21640 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, % 46
1.0
Fatigue Strength, MPa 320
260
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
85
Tensile Strength: Ultimate (UTS), MPa 740
900
Tensile Strength: Yield (Proof), MPa 350
540

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1430
1400
Melting Onset (Solidus), °C 1380
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 17
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
1.7

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.6
Embodied Carbon, kg CO2/kg material 3.6
7.8
Embodied Energy, MJ/kg 51
110
Embodied Water, L/kg 150
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 280
7.8
Resilience: Unit (Modulus of Resilience), kJ/m3 300
670
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 27
29
Strength to Weight: Bending, points 23
24
Thermal Diffusivity, mm2/s 4.0
3.9
Thermal Shock Resistance, points 16
26

Alloy Composition

Carbon (C), % 0 to 0.080
0.9 to 1.4
Chromium (Cr), % 17.5 to 19.5
27 to 32
Cobalt (Co), % 0
48.6 to 68.1
Iron (Fe), % 63 to 74.3
0 to 3.0
Manganese (Mn), % 3.5 to 6.5
0
Molybdenum (Mo), % 0.5 to 2.0
0 to 1.0
Nickel (Ni), % 4.0 to 6.5
0 to 3.0
Niobium (Nb), % 0.1 to 1.0
0
Nitrogen (N), % 0.080 to 0.3
0
Phosphorus (P), % 0 to 0.060
0
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
4.0 to 6.0