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ACI-ASTM CN7MS Steel vs. R30012 Cobalt

ACI-ASTM CN7MS steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. They have a modest 24% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CN7MS steel and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 39
1.0
Fatigue Strength, MPa 200
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 540
830
Tensile Strength: Yield (Proof), MPa 230
650

Thermal Properties

Latent Heat of Fusion, J/g 340
320
Melting Completion (Liquidus), °C 1400
1470
Melting Onset (Solidus), °C 1350
1280
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 12
15
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Density, g/cm3 7.9
8.8
Embodied Carbon, kg CO2/kg material 5.1
8.3
Embodied Energy, MJ/kg 71
120
Embodied Water, L/kg 180
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 140
960
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 19
26
Strength to Weight: Bending, points 19
22
Thermal Diffusivity, mm2/s 3.2
3.8
Thermal Shock Resistance, points 13
23

Alloy Composition

Carbon (C), % 0 to 0.070
1.4 to 2.0
Chromium (Cr), % 18 to 20
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Copper (Cu), % 1.5 to 2.0
0
Iron (Fe), % 45.4 to 53.5
0 to 3.0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 2.5 to 3.0
0 to 1.0
Nickel (Ni), % 22 to 25
0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 2.5 to 3.5
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
7.5 to 9.5