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R30003 Cobalt vs. SAE-AISI 4620 Steel

R30003 cobalt belongs to the cobalt alloys classification, while SAE-AISI 4620 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 4620 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 10 to 73
16 to 27
Fatigue Strength, MPa 320 to 560
260 to 360
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 83
73
Tensile Strength: Ultimate (UTS), MPa 970 to 1720
490 to 680
Tensile Strength: Yield (Proof), MPa 510 to 1090
350 to 550

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
47
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
3.2
Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.0
1.6
Embodied Energy, MJ/kg 110
22
Embodied Water, L/kg 400
50

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 600 to 2790
330 to 800
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 32 to 57
17 to 24
Strength to Weight: Bending, points 26 to 38
18 to 22
Thermal Diffusivity, mm2/s 3.3
13
Thermal Shock Resistance, points 26 to 45
15 to 20

Alloy Composition

Boron (B), % 0 to 0.1
0
Carbon (C), % 0 to 0.15
0.17 to 0.22
Chromium (Cr), % 19 to 21
0
Cobalt (Co), % 39 to 41
0
Iron (Fe), % 10 to 20.5
96.4 to 97.4
Manganese (Mn), % 1.5 to 2.5
0.45 to 0.65
Molybdenum (Mo), % 6.0 to 8.0
0.2 to 0.3
Nickel (Ni), % 14 to 16
1.7 to 2.0
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

Comparable Variants