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R30021 Cobalt vs. ACI-ASTM CG6MMN Steel

R30021 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CG6MMN steel belongs to the iron alloys. They have a modest 29% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is ACI-ASTM CG6MMN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 9.0
34
Fatigue Strength, MPa 250
260
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
79
Tensile Strength: Ultimate (UTS), MPa 700
670
Tensile Strength: Yield (Proof), MPa 500
320

Thermal Properties

Latent Heat of Fusion, J/g 330
300
Melting Completion (Liquidus), °C 1350
1420
Melting Onset (Solidus), °C 1190
1380
Specific Heat Capacity, J/kg-K 450
480
Thermal Expansion, µm/m-K 11
17

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
4.8
Embodied Energy, MJ/kg 110
68
Embodied Water, L/kg 520
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
190
Resilience: Unit (Modulus of Resilience), kJ/m3 570
260
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23
24
Strength to Weight: Bending, points 21
22
Thermal Shock Resistance, points 21
14

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.060
Chromium (Cr), % 26 to 29
20.5 to 23.5
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
51.9 to 62.1
Manganese (Mn), % 0
4.0 to 6.0
Molybdenum (Mo), % 4.5 to 6.0
1.5 to 3.0
Nickel (Ni), % 2.0 to 3.0
11.5 to 13.5
Niobium (Nb), % 0
0.1 to 0.3
Nitrogen (N), % 0
0.2 to 0.4
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Vanadium (V), % 0
0.1 to 0.3