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R30021 Cobalt vs. SAE-AISI 1018 Steel

R30021 cobalt belongs to the cobalt alloys classification, while SAE-AISI 1018 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 1018 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 9.0
17 to 27
Fatigue Strength, MPa 250
180 to 270
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 700
430 to 480
Tensile Strength: Yield (Proof), MPa 500
240 to 400

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
52
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
7.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.0

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.0
1.4
Embodied Energy, MJ/kg 110
18
Embodied Water, L/kg 520
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
75 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 570
150 to 430
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
15 to 17
Strength to Weight: Bending, points 21
16 to 17
Thermal Diffusivity, mm2/s 3.8
14
Thermal Shock Resistance, points 21
14 to 15

Alloy Composition

Carbon (C), % 0.2 to 0.35
0.15 to 0.2
Chromium (Cr), % 26 to 29
0
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
98.8 to 99.25
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