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R30155 Cobalt vs. EN 1.7218 Steel

Both R30155 cobalt and EN 1.7218 steel are iron alloys. They have a modest 33% 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 (11, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is EN 1.7218 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
150 to 230
Elastic (Young's, Tensile) Modulus, GPa 210
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
73
Tensile Strength: Ultimate (UTS), MPa 850
500 to 1550

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1100
420
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 12
44
Thermal Expansion, µm/m-K 14
13

Otherwise Unclassified Properties

Base Metal Price, % relative 80
2.6
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 9.7
1.5
Embodied Energy, MJ/kg 150
20
Embodied Water, L/kg 300
52

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 28
18 to 55
Strength to Weight: Bending, points 24
18 to 38
Thermal Diffusivity, mm2/s 3.2
12
Thermal Shock Resistance, points 21
15 to 46

Alloy Composition

Aluminum (Al), % 0
0 to 0.040
Carbon (C), % 0.080 to 0.16
0.22 to 0.29
Chromium (Cr), % 20 to 22.5
0.9 to 1.2
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 24.3 to 36.2
96.2 to 98.1
Manganese (Mn), % 1.0 to 2.0
0.6 to 0.9
Molybdenum (Mo), % 2.5 to 3.5
0.15 to 0.3
Nickel (Ni), % 19 to 21
0 to 0.3
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.035
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0