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R30016 Cobalt vs. AISI 303 Stainless Steel

R30016 cobalt belongs to the cobalt alloys classification, while AISI 303 stainless steel belongs to the iron 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 R30016 cobalt and the bottom bar is AISI 303 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 8.4
40 to 51
Fatigue Strength, MPa 290
230 to 360
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
77
Tensile Strength: Ultimate (UTS), MPa 1010
600 to 690
Tensile Strength: Yield (Proof), MPa 580
230 to 420

Thermal Properties

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

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
2.8

Otherwise Unclassified Properties

Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 7.7
3.0
Embodied Energy, MJ/kg 110
42
Embodied Water, L/kg 500
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 72
240
Resilience: Unit (Modulus of Resilience), kJ/m3 770
140 to 440
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33
21 to 25
Strength to Weight: Bending, points 26
20 to 22
Thermal Diffusivity, mm2/s 3.9
4.4
Thermal Shock Resistance, points 24
13 to 15

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.15
Chromium (Cr), % 28 to 32
17 to 19
Cobalt (Co), % 49.6 to 66.9
0
Iron (Fe), % 0 to 3.0
67.3 to 74.9
Manganese (Mn), % 0.5 to 2.0
0 to 2.0
Molybdenum (Mo), % 0 to 1.5
0
Nickel (Ni), % 0 to 3.0
8.0 to 10
Phosphorus (P), % 0
0 to 0.2
Silicon (Si), % 0.2 to 2.0
0 to 1.0
Sulfur (S), % 0
0.15 to 0.35
Tungsten (W), % 3.5 to 5.5
0