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AISI 304 Stainless Steel vs. R30016 Cobalt

AISI 304 stainless steel belongs to the iron alloys classification, while R30016 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 (12, in this case) are not shown.

For each property being compared, the top bar is AISI 304 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, % 8.0 to 43
8.4
Fatigue Strength, MPa 210 to 440
290
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
85
Tensile Strength: Ultimate (UTS), MPa 580 to 1180
1010
Tensile Strength: Yield (Proof), MPa 230 to 860
580

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1450
1360
Melting Onset (Solidus), °C 1400
1270
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 17
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
2.0

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 3.0
7.7
Embodied Energy, MJ/kg 43
110
Embodied Water, L/kg 150
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 86 to 250
72
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 1870
770
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21 to 42
33
Strength to Weight: Bending, points 20 to 32
26
Thermal Diffusivity, mm2/s 4.2
3.9
Thermal Shock Resistance, points 12 to 25
24

Alloy Composition

Carbon (C), % 0 to 0.080
0.9 to 1.4
Chromium (Cr), % 18 to 20
28 to 32
Cobalt (Co), % 0
49.6 to 66.9
Iron (Fe), % 66.5 to 74
0 to 3.0
Manganese (Mn), % 0 to 2.0
0.5 to 2.0
Molybdenum (Mo), % 0
0 to 1.5
Nickel (Ni), % 8.0 to 10.5
0 to 3.0
Nitrogen (N), % 0 to 0.1
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 0.75
0.2 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
3.5 to 5.5