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ACI-ASTM CA6NM Steel vs. R30016 Cobalt

ACI-ASTM CA6NM steel belongs to the iron alloys classification, while R30016 cobalt belongs to the cobalt alloys. There are 28 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 CA6NM steel and the bottom bar is R30016 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 17
8.4
Fatigue Strength, MPa 380
290
Poisson's Ratio 0.28
0.28
Reduction in Area, % 40
8.0
Shear Modulus, GPa 76
85
Tensile Strength: Ultimate (UTS), MPa 850
1010
Tensile Strength: Yield (Proof), MPa 620
580

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1450
1360
Melting Onset (Solidus), °C 1400
1270
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 25
15
Thermal Expansion, µm/m-K 10
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 3.2
2.0

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 2.5
7.7
Embodied Energy, MJ/kg 34
110
Embodied Water, L/kg 110
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
72
Resilience: Unit (Modulus of Resilience), kJ/m3 1000
770
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 30
33
Strength to Weight: Bending, points 26
26
Thermal Diffusivity, mm2/s 6.7
3.9
Thermal Shock Resistance, points 31
24

Alloy Composition

Carbon (C), % 0 to 0.060
0.9 to 1.4
Chromium (Cr), % 11.5 to 14
28 to 32
Cobalt (Co), % 0
49.6 to 66.9
Iron (Fe), % 78.4 to 84.6
0 to 3.0
Manganese (Mn), % 0 to 1.0
0.5 to 2.0
Molybdenum (Mo), % 0.4 to 1.0
0 to 1.5
Nickel (Ni), % 3.5 to 4.5
0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0.2 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
3.5 to 5.5