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R30021 Cobalt vs. SAE-AISI 1084 Steel

R30021 cobalt belongs to the cobalt alloys classification, while SAE-AISI 1084 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is SAE-AISI 1084 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 9.0
11
Fatigue Strength, MPa 250
320 to 370
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
72
Tensile Strength: Ultimate (UTS), MPa 700
780 to 930
Tensile Strength: Yield (Proof), MPa 500
510 to 600

Thermal Properties

Latent Heat of Fusion, J/g 330
240
Melting Completion (Liquidus), °C 1350
1450
Melting Onset (Solidus), °C 1190
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
51
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.2

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
1.4
Embodied Energy, MJ/kg 110
19
Embodied Water, L/kg 520
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
81 to 89
Resilience: Unit (Modulus of Resilience), kJ/m3 570
700 to 960
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
28 to 33
Strength to Weight: Bending, points 21
24 to 27
Thermal Diffusivity, mm2/s 3.8
14
Thermal Shock Resistance, points 21
25 to 30

Alloy Composition

Carbon (C), % 0.2 to 0.35
0.8 to 0.93
Chromium (Cr), % 26 to 29
0
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
98.1 to 98.6
Manganese (Mn), % 0
0.6 to 0.9
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.5
0
Sulfur (S), % 0
0 to 0.050