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R30021 Cobalt vs. ASTM A372 Grade C Steel

R30021 cobalt belongs to the cobalt alloys classification, while ASTM A372 grade C 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 ASTM A372 grade C steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 9.0
17
Fatigue Strength, MPa 250
290
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 700
710
Tensile Strength: Yield (Proof), MPa 500
430

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
51
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.2

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
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
100
Resilience: Unit (Modulus of Resilience), kJ/m3 570
500
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
25
Strength to Weight: Bending, points 21
23
Thermal Diffusivity, mm2/s 3.8
14
Thermal Shock Resistance, points 21
22

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.48
Chromium (Cr), % 26 to 29
0
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
97.5 to 99.85
Manganese (Mn), % 0
0 to 1.7
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 1.5
0.15 to 0.35
Sulfur (S), % 0
0 to 0.010