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ACI-ASTM CN7M Steel vs. R30021 Cobalt

ACI-ASTM CN7M steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. They have a modest 28% 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 (7, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CN7M steel and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 44
9.0
Fatigue Strength, MPa 190
250
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 480
700
Tensile Strength: Yield (Proof), MPa 200
500

Thermal Properties

Latent Heat of Fusion, J/g 310
330
Melting Completion (Liquidus), °C 1410
1350
Melting Onset (Solidus), °C 1450
1190
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 21
15
Thermal Expansion, µm/m-K 15
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.1

Otherwise Unclassified Properties

Density, g/cm3 8.1
8.4
Embodied Carbon, kg CO2/kg material 5.6
8.0
Embodied Energy, MJ/kg 78
110
Embodied Water, L/kg 210
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
57
Resilience: Unit (Modulus of Resilience), kJ/m3 110
570
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
23
Strength to Weight: Bending, points 17
21
Thermal Diffusivity, mm2/s 5.6
3.8
Thermal Shock Resistance, points 12
21

Alloy Composition

Carbon (C), % 0 to 0.070
0.2 to 0.35
Chromium (Cr), % 19 to 22
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 3.0 to 4.0
0
Iron (Fe), % 37.4 to 48.5
0 to 3.0
Manganese (Mn), % 0 to 1.5
0
Molybdenum (Mo), % 2.0 to 3.0
4.5 to 6.0
Nickel (Ni), % 27.5 to 30.5
2.0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.5
0 to 1.5
Sulfur (S), % 0 to 0.040
0