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S44800 Stainless Steel vs. R30006 Cobalt

S44800 stainless steel belongs to the iron alloys classification, while R30006 cobalt belongs to the cobalt alloys. They have a modest 33% 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 S44800 stainless steel and the bottom bar is R30006 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 23
1.0
Fatigue Strength, MPa 300
260
Poisson's Ratio 0.27
0.28
Rockwell C Hardness 18
40
Shear Modulus, GPa 82
85
Tensile Strength: Ultimate (UTS), MPa 590
900
Tensile Strength: Yield (Proof), MPa 450
540

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Melting Completion (Liquidus), °C 1460
1400
Melting Onset (Solidus), °C 1410
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 17
15
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.6
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
1.7

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.6
Embodied Carbon, kg CO2/kg material 3.8
7.8
Embodied Energy, MJ/kg 52
110
Embodied Water, L/kg 190
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
7.8
Resilience: Unit (Modulus of Resilience), kJ/m3 480
670
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 21
29
Strength to Weight: Bending, points 20
24
Thermal Diffusivity, mm2/s 4.6
3.9
Thermal Shock Resistance, points 19
26

Alloy Composition

Carbon (C), % 0 to 0.010
0.9 to 1.4
Chromium (Cr), % 28 to 30
27 to 32
Cobalt (Co), % 0
48.6 to 68.1
Copper (Cu), % 0 to 0.15
0
Iron (Fe), % 62.6 to 66.5
0 to 3.0
Manganese (Mn), % 0 to 0.3
0
Molybdenum (Mo), % 3.5 to 4.2
0 to 1.0
Nickel (Ni), % 2.0 to 2.5
0 to 3.0
Nitrogen (N), % 0 to 0.020
0
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.2
0 to 2.0
Sulfur (S), % 0 to 0.020
0
Tungsten (W), % 0
4.0 to 6.0