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R30006 Cobalt vs. ACI-ASTM CG3M Steel

R30006 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CG3M steel belongs to the iron alloys. They have a modest 24% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is R30006 cobalt and the bottom bar is ACI-ASTM CG3M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
28
Fatigue Strength, MPa 260
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
79
Tensile Strength: Ultimate (UTS), MPa 900
580
Tensile Strength: Yield (Proof), MPa 540
270

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1400
1450
Melting Onset (Solidus), °C 1290
1400
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 11
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 1.7
2.3

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.9
Embodied Carbon, kg CO2/kg material 7.8
4.1
Embodied Energy, MJ/kg 110
56
Embodied Water, L/kg 500
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
130
Resilience: Unit (Modulus of Resilience), kJ/m3 670
190
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 29
20
Strength to Weight: Bending, points 24
20
Thermal Diffusivity, mm2/s 3.9
4.1
Thermal Shock Resistance, points 26
13

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.030
Chromium (Cr), % 27 to 32
18 to 21
Cobalt (Co), % 48.6 to 68.1
0
Iron (Fe), % 0 to 3.0
58.9 to 70
Manganese (Mn), % 0
0 to 1.5
Molybdenum (Mo), % 0 to 1.0
3.0 to 4.0
Nickel (Ni), % 0 to 3.0
9.0 to 13
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.5
Sulfur (S), % 0
0 to 0.040
Tungsten (W), % 4.0 to 6.0
0