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R30003 Cobalt vs. SAE-AISI 8640 Steel

R30003 cobalt belongs to the cobalt alloys classification, while SAE-AISI 8640 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is R30003 cobalt and the bottom bar is SAE-AISI 8640 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 10 to 73
23
Fatigue Strength, MPa 320 to 560
270
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 83
73
Tensile Strength: Ultimate (UTS), MPa 970 to 1720
570
Tensile Strength: Yield (Proof), MPa 510 to 1090
380

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1440
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 95
2.6
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 400
50

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 600 to 2790
380
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 32 to 57
20
Strength to Weight: Bending, points 26 to 38
20
Thermal Diffusivity, mm2/s 3.3
10
Thermal Shock Resistance, points 26 to 45
17

Alloy Composition

Boron (B), % 0 to 0.1
0
Carbon (C), % 0 to 0.15
0.38 to 0.43
Chromium (Cr), % 19 to 21
0.4 to 0.6
Cobalt (Co), % 39 to 41
0
Iron (Fe), % 10 to 20.5
96.6 to 97.8
Manganese (Mn), % 1.5 to 2.5
0.75 to 1.0
Molybdenum (Mo), % 6.0 to 8.0
0.15 to 0.25
Nickel (Ni), % 14 to 16
0.4 to 0.7
Phosphorus (P), % 0 to 0.015
0 to 0.035
Silicon (Si), % 0 to 1.2
0.15 to 0.35
Sulfur (S), % 0 to 0.015
0 to 0.040