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EN 1.4740 Stainless Steel vs. R30008 Cobalt

EN 1.4740 stainless steel belongs to the iron alloys classification, while R30008 cobalt belongs to the cobalt alloys. They have a modest 33% of their average alloy composition in common, which, by itself, doesn't mean much. There are 16 material properties with values for both materials. Properties with values for just one material (15, 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 R30008 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 22
1.1 to 73
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
83

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Melting Completion (Liquidus), °C 1420
1400
Melting Onset (Solidus), °C 1370
1330
Specific Heat Capacity, J/kg-K 490
450
Thermal Expansion, µm/m-K 10
13

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
95
Density, g/cm3 7.6
8.4
Embodied Carbon, kg CO2/kg material 2.3
8.1
Embodied Energy, MJ/kg 32
110
Embodied Water, L/kg 120
400

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24

Alloy Composition

Boron (B), % 0
0 to 0.0010
Carbon (C), % 0.3 to 0.5
0 to 0.15
Chromium (Cr), % 16 to 19
18.5 to 21.5
Cobalt (Co), % 0
39 to 42
Iron (Fe), % 75.4 to 82.7
7.6 to 20
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 0 to 0.5
6.5 to 7.5
Nickel (Ni), % 0 to 1.0
15 to 18
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 1.0 to 2.5
0 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.015