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ACI-ASTM CA40 Steel vs. R30012 Cobalt

ACI-ASTM CA40 steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. 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 CA40 steel and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 10
1.0
Fatigue Strength, MPa 460
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
86
Tensile Strength: Ultimate (UTS), MPa 910
830
Tensile Strength: Yield (Proof), MPa 860
650

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1440
1470
Melting Onset (Solidus), °C 1500
1280
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 25
15
Thermal Expansion, µm/m-K 10
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.8
Embodied Carbon, kg CO2/kg material 2.0
8.3
Embodied Energy, MJ/kg 28
120
Embodied Water, L/kg 100
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 1910
960
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 33
26
Strength to Weight: Bending, points 27
22
Thermal Diffusivity, mm2/s 6.7
3.8
Thermal Shock Resistance, points 33
23

Alloy Composition

Carbon (C), % 0.2 to 0.4
1.4 to 2.0
Chromium (Cr), % 11.5 to 14
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Iron (Fe), % 81.5 to 88.3
0 to 3.0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0 to 0.5
0 to 1.0
Nickel (Ni), % 0 to 1.0
0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.5
0 to 2.0
Sulfur (S), % 0 to 0.040
0
Tungsten (W), % 0
7.5 to 9.5