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S21800 Stainless Steel vs. R30006 Cobalt

S21800 stainless steel belongs to the iron alloys classification, while R30006 cobalt belongs to the cobalt alloys. They have a modest 21% 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 (15, in this case) are not shown.

For each property being compared, the top bar is S21800 stainless steel and the bottom bar is R30006 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 40
1.0
Fatigue Strength, MPa 330
260
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
85
Tensile Strength: Ultimate (UTS), MPa 740
900
Tensile Strength: Yield (Proof), MPa 390
540

Thermal Properties

Latent Heat of Fusion, J/g 340
320
Melting Completion (Liquidus), °C 1360
1400
Melting Onset (Solidus), °C 1310
1290
Specific Heat Capacity, J/kg-K 500
450
Thermal Expansion, µm/m-K 16
11

Otherwise Unclassified Properties

Density, g/cm3 7.5
8.6
Embodied Carbon, kg CO2/kg material 3.1
7.8
Embodied Energy, MJ/kg 45
110
Embodied Water, L/kg 150
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
7.8
Resilience: Unit (Modulus of Resilience), kJ/m3 390
670
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
23
Strength to Weight: Axial, points 27
29
Strength to Weight: Bending, points 24
24
Thermal Shock Resistance, points 17
26

Alloy Composition

Carbon (C), % 0 to 0.1
0.9 to 1.4
Chromium (Cr), % 16 to 18
27 to 32
Cobalt (Co), % 0
48.6 to 68.1
Iron (Fe), % 59.1 to 65.4
0 to 3.0
Manganese (Mn), % 7.0 to 9.0
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 8.0 to 9.0
0 to 3.0
Nitrogen (N), % 0.080 to 0.18
0
Phosphorus (P), % 0 to 0.060
0
Silicon (Si), % 3.5 to 4.5
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
4.0 to 6.0