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ACI-ASTM CD6MN Steel vs. R31537 Cobalt

ACI-ASTM CD6MN steel belongs to the iron alloys classification, while R31537 cobalt belongs to the cobalt alloys. They have a modest 30% 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 (6, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CD6MN steel and the bottom bar is R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 28
14 to 23
Fatigue Strength, MPa 370
310 to 480
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 80
87
Tensile Strength: Ultimate (UTS), MPa 730
1000 to 1340
Tensile Strength: Yield (Proof), MPa 510
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Melting Completion (Liquidus), °C 1440
1360
Melting Onset (Solidus), °C 1390
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 16
13
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.4
Embodied Carbon, kg CO2/kg material 3.4
8.1
Embodied Energy, MJ/kg 48
110
Embodied Water, L/kg 170
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 650
780 to 1990
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 26
33 to 44
Strength to Weight: Bending, points 23
26 to 32
Thermal Diffusivity, mm2/s 4.4
3.4
Thermal Shock Resistance, points 20
24 to 32

Alloy Composition

Carbon (C), % 0 to 0.060
0 to 0.14
Chromium (Cr), % 24 to 27
26 to 30
Cobalt (Co), % 0
58.9 to 69
Iron (Fe), % 62.1 to 70.1
0 to 0.75
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 1.8 to 2.5
5.0 to 7.0
Nickel (Ni), % 4.0 to 6.0
0 to 1.0
Nitrogen (N), % 0.15 to 0.25
0 to 0.25
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.040
0