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R30012 Cobalt vs. SAE-AISI 8822 Steel

R30012 cobalt belongs to the cobalt alloys classification, while SAE-AISI 8822 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 SAE-AISI 8822 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 1.0
23
Fatigue Strength, MPa 320
270
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 830
540
Tensile Strength: Yield (Proof), MPa 650
370

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
38
Thermal Expansion, µm/m-K 12
11

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
1.6
Embodied Energy, MJ/kg 120
21
Embodied Water, L/kg 480
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
110
Resilience: Unit (Modulus of Resilience), kJ/m3 960
360
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26
19
Strength to Weight: Bending, points 22
19
Thermal Diffusivity, mm2/s 3.8
10
Thermal Shock Resistance, points 23
18

Alloy Composition

Carbon (C), % 1.4 to 2.0
0.2 to 0.25
Chromium (Cr), % 27 to 32
0.4 to 0.6
Cobalt (Co), % 47.5 to 64.1
0
Iron (Fe), % 0 to 3.0
96.6 to 97.8
Manganese (Mn), % 0
0.75 to 1.0
Molybdenum (Mo), % 0 to 1.0
0.3 to 0.4
Nickel (Ni), % 0 to 3.0
0.4 to 0.7
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 2.0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Tungsten (W), % 7.5 to 9.5
0