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R30021 Cobalt vs. SAE-AISI 5160 Steel

R30021 cobalt belongs to the cobalt alloys classification, while SAE-AISI 5160 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 R30021 cobalt and the bottom bar is SAE-AISI 5160 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 9.0
12 to 18
Fatigue Strength, MPa 250
180 to 650
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 700
660 to 1150
Tensile Strength: Yield (Proof), MPa 500
280 to 1010

Thermal Properties

Latent Heat of Fusion, J/g 330
250
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
43
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.3

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
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
73 to 160
Resilience: Unit (Modulus of Resilience), kJ/m3 570
200 to 2700
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
23 to 41
Strength to Weight: Bending, points 21
22 to 31
Thermal Diffusivity, mm2/s 3.8
12
Thermal Shock Resistance, points 21
19 to 34

Alloy Composition

Carbon (C), % 0.2 to 0.35
0.56 to 0.61
Chromium (Cr), % 26 to 29
0.7 to 0.9
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
97.1 to 97.8
Manganese (Mn), % 0
0.75 to 1.0
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 1.5
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040