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AISI 316L Stainless Steel vs. R30006 Cobalt

AISI 316L 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 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 AISI 316L stainless steel and the bottom bar is R30006 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 9.0 to 50
1.0
Fatigue Strength, MPa 170 to 450
260
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
85
Tensile Strength: Ultimate (UTS), MPa 530 to 1160
900
Tensile Strength: Yield (Proof), MPa 190 to 870
540

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1400
1400
Melting Onset (Solidus), °C 1380
1290
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 16
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
1.7

Otherwise Unclassified Properties

Calomel Potential, mV -50
-250
Density, g/cm3 7.9
8.6
Embodied Carbon, kg CO2/kg material 3.9
7.8
Embodied Energy, MJ/kg 53
110
Embodied Water, L/kg 150
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 230
7.8
Resilience: Unit (Modulus of Resilience), kJ/m3 93 to 1880
670
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 19 to 41
29
Strength to Weight: Bending, points 18 to 31
24
Thermal Diffusivity, mm2/s 4.1
3.9
Thermal Shock Resistance, points 12 to 25
26

Alloy Composition

Carbon (C), % 0 to 0.030
0.9 to 1.4
Chromium (Cr), % 16 to 18
27 to 32
Cobalt (Co), % 0
48.6 to 68.1
Iron (Fe), % 62 to 72
0 to 3.0
Manganese (Mn), % 0 to 2.0
0
Molybdenum (Mo), % 2.0 to 3.0
0 to 1.0
Nickel (Ni), % 10 to 14
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 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
4.0 to 6.0