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S44635 Stainless Steel vs. R30016 Cobalt

S44635 stainless steel belongs to the iron alloys classification, while R30016 cobalt belongs to the cobalt alloys. They have a modest 30% 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 (10, in this case) are not shown.

For each property being compared, the top bar is S44635 stainless steel and the bottom bar is R30016 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 23
8.4
Fatigue Strength, MPa 390
290
Poisson's Ratio 0.27
0.28
Rockwell C Hardness 24
37
Shear Modulus, GPa 81
85
Tensile Strength: Ultimate (UTS), MPa 710
1010
Tensile Strength: Yield (Proof), MPa 580
580

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Melting Completion (Liquidus), °C 1460
1360
Melting Onset (Solidus), °C 1420
1270
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 11
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.0

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 4.4
7.7
Embodied Energy, MJ/kg 62
110
Embodied Water, L/kg 170
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
72
Resilience: Unit (Modulus of Resilience), kJ/m3 810
770
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25
33
Strength to Weight: Bending, points 23
26
Thermal Diffusivity, mm2/s 4.4
3.9
Thermal Shock Resistance, points 23
24

Alloy Composition

Carbon (C), % 0 to 0.025
0.9 to 1.4
Chromium (Cr), % 24.5 to 26
28 to 32
Cobalt (Co), % 0
49.6 to 66.9
Iron (Fe), % 61.5 to 68.5
0 to 3.0
Manganese (Mn), % 0 to 1.0
0.5 to 2.0
Molybdenum (Mo), % 3.5 to 4.5
0 to 1.5
Nickel (Ni), % 3.5 to 4.5
0 to 3.0
Niobium (Nb), % 0.2 to 0.8
0
Nitrogen (N), % 0 to 0.035
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.75
0.2 to 2.0
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0.2 to 0.8
0
Tungsten (W), % 0
3.5 to 5.5