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R30021 Cobalt vs. EN 1.7227 Steel

R30021 cobalt belongs to the cobalt alloys classification, while EN 1.7227 steel belongs to the iron alloys. There are 23 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is EN 1.7227 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Poisson's Ratio 0.29
0.29
Rockwell C Hardness 32
50 to 57
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 700
540 to 1850

Thermal Properties

Latent Heat of Fusion, J/g 330
250
Melting Completion (Liquidus), °C 1350
1460
Melting Onset (Solidus), °C 1190
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
46
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.4

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
1.5
Embodied Energy, MJ/kg 110
20
Embodied Water, L/kg 520
51

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
19 to 65
Strength to Weight: Bending, points 21
19 to 43
Thermal Diffusivity, mm2/s 3.8
12
Thermal Shock Resistance, points 21
16 to 54

Alloy Composition

Carbon (C), % 0.2 to 0.35
0.38 to 0.45
Chromium (Cr), % 26 to 29
0.9 to 1.2
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 3.0
96.5 to 98
Manganese (Mn), % 0
0.6 to 0.9
Molybdenum (Mo), % 4.5 to 6.0
0.15 to 0.3
Nickel (Ni), % 2.0 to 3.0
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 1.5
0 to 0.3
Sulfur (S), % 0
0.020 to 0.040