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R30001 Cobalt vs. AISI 303 Stainless Steel

R30001 cobalt belongs to the cobalt alloys classification, while AISI 303 stainless steel belongs to the iron alloys. They have a modest 22% 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 (13, in this case) are not shown.

For each property being compared, the top bar is R30001 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, % 1.0
40 to 51
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 620
600 to 690

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Melting Completion (Liquidus), °C 1530
1450
Melting Onset (Solidus), °C 1260
1400
Specific Heat Capacity, J/kg-K 430
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 11
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.8

Otherwise Unclassified Properties

Density, g/cm3 9.0
7.8
Embodied Carbon, kg CO2/kg material 8.9
3.0
Embodied Energy, MJ/kg 130
42
Embodied Water, L/kg 460
140

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 19
21 to 25
Strength to Weight: Bending, points 18
20 to 22
Thermal Diffusivity, mm2/s 3.7
4.4
Thermal Shock Resistance, points 19
13 to 15

Alloy Composition

Carbon (C), % 2.0 to 3.0
0 to 0.15
Chromium (Cr), % 28 to 32
17 to 19
Cobalt (Co), % 43 to 59
0
Iron (Fe), % 0 to 3.0
67.3 to 74.9
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 0 to 1.0
0
Nickel (Ni), % 0 to 3.0
8.0 to 10
Phosphorus (P), % 0
0 to 0.2
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0
0.15 to 0.35
Tungsten (W), % 11 to 13
0