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R30816 Cobalt vs. AISI 301 Stainless Steel

R30816 cobalt belongs to the cobalt alloys classification, while AISI 301 stainless steel belongs to the iron alloys. They have a modest 28% of their average alloy composition in common, which, by itself, doesn't mean much. There are 26 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 R30816 cobalt and the bottom bar is AISI 301 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
190 to 440
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 23
7.4 to 46
Fatigue Strength, MPa 250
210 to 600
Poisson's Ratio 0.3
0.28
Shear Modulus, GPa 81
77
Tensile Strength: Ultimate (UTS), MPa 1020
590 to 1460
Tensile Strength: Yield (Proof), MPa 460
230 to 1080

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Melting Completion (Liquidus), °C 1540
1420
Melting Onset (Solidus), °C 1460
1400
Specific Heat Capacity, J/kg-K 420
480
Thermal Conductivity, W/m-K 13
16
Thermal Expansion, µm/m-K 12
17

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.8
Embodied Carbon, kg CO2/kg material 20
2.7
Embodied Energy, MJ/kg 320
39
Embodied Water, L/kg 440
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
99 to 300
Resilience: Unit (Modulus of Resilience), kJ/m3 510
130 to 2970
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 31
21 to 52
Strength to Weight: Bending, points 25
20 to 37
Thermal Diffusivity, mm2/s 3.3
4.2
Thermal Shock Resistance, points 28
12 to 31

Alloy Composition

Carbon (C), % 0.32 to 0.42
0 to 0.15
Chromium (Cr), % 19 to 21
16 to 18
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
70.7 to 78
Manganese (Mn), % 1.0 to 2.0
0 to 2.0
Molybdenum (Mo), % 3.5 to 4.5
0
Nickel (Ni), % 19 to 21
6.0 to 8.0
Niobium (Nb), % 3.5 to 4.5
0
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0