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R30021 Cobalt vs. SAE-AISI 52100 Steel

R30021 cobalt belongs to the cobalt alloys classification, while SAE-AISI 52100 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 52100 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 9.0
10 to 20
Fatigue Strength, MPa 250
250 to 340
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
72
Tensile Strength: Ultimate (UTS), MPa 700
590 to 2010
Tensile Strength: Yield (Proof), MPa 500
360 to 560

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
47
Thermal Expansion, µm/m-K 11
12 to 13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.5

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
1.5
Embodied Energy, MJ/kg 110
20
Embodied Water, L/kg 520
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
54 to 310
Resilience: Unit (Modulus of Resilience), kJ/m3 570
350 to 840
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
21 to 72
Strength to Weight: Bending, points 21
20 to 45
Thermal Diffusivity, mm2/s 3.8
13
Thermal Shock Resistance, points 21
19 to 61

Alloy Composition

Carbon (C), % 0.2 to 0.35
0.93 to 1.1
Chromium (Cr), % 26 to 29
1.4 to 1.6
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
96.5 to 97.3
Manganese (Mn), % 0
0.25 to 0.45
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 1.5
0.15 to 0.35
Sulfur (S), % 0
0 to 0.015