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AISI 446 Stainless Steel vs. R30016 Cobalt

AISI 446 stainless steel belongs to the iron alloys classification, while R30016 cobalt belongs to the cobalt alloys. They have a modest 28% 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 (12, in this case) are not shown.

For each property being compared, the top bar is AISI 446 stainless steel and the bottom bar is R30016 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 23
8.4
Fatigue Strength, MPa 200
290
Poisson's Ratio 0.27
0.28
Reduction in Area, % 50
8.0
Shear Modulus, GPa 79
85
Tensile Strength: Ultimate (UTS), MPa 570
1010
Tensile Strength: Yield (Proof), MPa 300
580

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1510
1360
Melting Onset (Solidus), °C 1430
1270
Specific Heat Capacity, J/kg-K 490
450
Thermal Conductivity, W/m-K 17
15
Thermal Expansion, µm/m-K 11
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.0

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.5
Embodied Carbon, kg CO2/kg material 2.4
7.7
Embodied Energy, MJ/kg 35
110
Embodied Water, L/kg 150
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
72
Resilience: Unit (Modulus of Resilience), kJ/m3 230
770
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 21
33
Strength to Weight: Bending, points 20
26
Thermal Diffusivity, mm2/s 4.6
3.9
Thermal Shock Resistance, points 19
24

Alloy Composition

Carbon (C), % 0 to 0.2
0.9 to 1.4
Chromium (Cr), % 23 to 27
28 to 32
Cobalt (Co), % 0
49.6 to 66.9
Iron (Fe), % 69.2 to 77
0 to 3.0
Manganese (Mn), % 0 to 1.5
0.5 to 2.0
Molybdenum (Mo), % 0
0 to 1.5
Nickel (Ni), % 0 to 0.75
0 to 3.0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0.2 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
3.5 to 5.5