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EN 1.4740 Stainless Steel vs. R30016 Cobalt

EN 1.4740 stainless steel belongs to the iron alloys classification, while R30016 cobalt belongs to the cobalt alloys. They have a modest 22% of their average alloy composition in common, which, by itself, doesn't mean much. There are 19 material properties with values for both materials. Properties with values for just one material (18, in this case) are not shown.

For each property being compared, the top bar is EN 1.4740 stainless steel and the bottom bar is R30016 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 22
8.4
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
85

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Melting Completion (Liquidus), °C 1420
1360
Melting Onset (Solidus), °C 1370
1270
Specific Heat Capacity, J/kg-K 490
450
Thermal Conductivity, W/m-K 18
15
Thermal Expansion, µm/m-K 10
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
2.0

Otherwise Unclassified Properties

Density, g/cm3 7.6
8.5
Embodied Carbon, kg CO2/kg material 2.3
7.7
Embodied Energy, MJ/kg 32
110
Embodied Water, L/kg 120
500

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Thermal Diffusivity, mm2/s 4.8
3.9

Alloy Composition

Carbon (C), % 0.3 to 0.5
0.9 to 1.4
Chromium (Cr), % 16 to 19
28 to 32
Cobalt (Co), % 0
49.6 to 66.9
Iron (Fe), % 75.4 to 82.7
0 to 3.0
Manganese (Mn), % 0 to 1.0
0.5 to 2.0
Molybdenum (Mo), % 0 to 0.5
0 to 1.5
Nickel (Ni), % 0 to 1.0
0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 1.0 to 2.5
0.2 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
3.5 to 5.5