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N08800 Stainless Steel vs. R30001 Cobalt

N08800 stainless steel belongs to the iron alloys classification, while R30001 cobalt belongs to the cobalt alloys. They have a modest 25% 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 (12, in this case) are not shown.

For each property being compared, the top bar is N08800 stainless steel and the bottom bar is R30001 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 4.5 to 34
1.0
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 500 to 1000
620

Thermal Properties

Latent Heat of Fusion, J/g 300
310
Melting Completion (Liquidus), °C 1390
1530
Melting Onset (Solidus), °C 1360
1260
Specific Heat Capacity, J/kg-K 480
430
Thermal Conductivity, W/m-K 12
15
Thermal Expansion, µm/m-K 14
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 1.9
1.8

Otherwise Unclassified Properties

Density, g/cm3 8.0
9.0
Embodied Carbon, kg CO2/kg material 5.3
8.9
Embodied Energy, MJ/kg 76
130
Embodied Water, L/kg 200
460

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 18 to 35
19
Strength to Weight: Bending, points 18 to 28
18
Thermal Diffusivity, mm2/s 3.0
3.7
Thermal Shock Resistance, points 13 to 25
19

Alloy Composition

Aluminum (Al), % 0.15 to 0.6
0
Carbon (C), % 0 to 0.1
2.0 to 3.0
Chromium (Cr), % 19 to 23
28 to 32
Cobalt (Co), % 0
43 to 59
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 39.5 to 50.7
0 to 3.0
Manganese (Mn), % 0 to 1.5
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 30 to 35
0 to 3.0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.015
0
Titanium (Ti), % 0.15 to 0.6
0
Tungsten (W), % 0
11 to 13