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R30012 Cobalt vs. EN 1.7221 Steel

R30012 cobalt belongs to the cobalt alloys classification, while EN 1.7221 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is R30012 cobalt and the bottom bar is EN 1.7221 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 1.0
11 to 17
Fatigue Strength, MPa 320
290 to 390
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 830
650 to 780
Tensile Strength: Yield (Proof), MPa 650
430 to 630

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1280
1420
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 15
44
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
8.4

Otherwise Unclassified Properties

Density, g/cm3 8.8
7.8
Embodied Carbon, kg CO2/kg material 8.3
1.5
Embodied Energy, MJ/kg 120
20
Embodied Water, L/kg 480
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
83 to 98
Resilience: Unit (Modulus of Resilience), kJ/m3 960
490 to 1050
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26
23 to 27
Strength to Weight: Bending, points 22
21 to 24
Thermal Diffusivity, mm2/s 3.8
12
Thermal Shock Resistance, points 23
19 to 23

Alloy Composition

Carbon (C), % 1.4 to 2.0
0.22 to 0.29
Chromium (Cr), % 27 to 32
0.8 to 1.2
Cobalt (Co), % 47.5 to 64.1
0
Iron (Fe), % 0 to 3.0
96.8 to 98.3
Manganese (Mn), % 0
0.5 to 0.8
Molybdenum (Mo), % 0 to 1.0
0.15 to 0.3
Nickel (Ni), % 0 to 3.0
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 2.0
0 to 0.6
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 7.5 to 9.5
0