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R30001 Cobalt vs. AISI 316 Stainless Steel

R30001 cobalt belongs to the cobalt alloys classification, while AISI 316 stainless steel belongs to the iron alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is R30001 cobalt and the bottom bar is AISI 316 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
8.0 to 55
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
78
Tensile Strength: Ultimate (UTS), MPa 620
520 to 1180

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Melting Completion (Liquidus), °C 1530
1400
Melting Onset (Solidus), °C 1260
1380
Specific Heat Capacity, J/kg-K 430
470
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 11
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.6

Otherwise Unclassified Properties

Density, g/cm3 9.0
7.9
Embodied Carbon, kg CO2/kg material 8.9
3.9
Embodied Energy, MJ/kg 130
53
Embodied Water, L/kg 460
150

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 19
18 to 41
Strength to Weight: Bending, points 18
18 to 31
Thermal Diffusivity, mm2/s 3.7
4.1
Thermal Shock Resistance, points 19
11 to 26

Alloy Composition

Carbon (C), % 2.0 to 3.0
0 to 0.080
Chromium (Cr), % 28 to 32
16 to 18
Cobalt (Co), % 43 to 59
0
Iron (Fe), % 0 to 3.0
62 to 72
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 0 to 1.0
2.0 to 3.0
Nickel (Ni), % 0 to 3.0
10 to 14
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 2.0
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 11 to 13
0