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ACI-ASTM CA6N Steel vs. R30816 Cobalt

ACI-ASTM CA6N steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have a modest 22% of their average alloy composition in common, which, by itself, doesn't mean much. There are 26 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 CA6N steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 17
23
Fatigue Strength, MPa 640
250
Poisson's Ratio 0.28
0.3
Reduction in Area, % 57
22
Shear Modulus, GPa 75
81
Tensile Strength: Ultimate (UTS), MPa 1080
1020
Tensile Strength: Yield (Proof), MPa 1060
460

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Melting Completion (Liquidus), °C 1440
1540
Melting Onset (Solidus), °C 1400
1460
Specific Heat Capacity, J/kg-K 480
420
Thermal Conductivity, W/m-K 23
13
Thermal Expansion, µm/m-K 9.9
12

Otherwise Unclassified Properties

Density, g/cm3 7.8
9.1
Embodied Carbon, kg CO2/kg material 2.5
20
Embodied Energy, MJ/kg 35
320
Embodied Water, L/kg 110
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
190
Resilience: Unit (Modulus of Resilience), kJ/m3 2900
510
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 38
31
Strength to Weight: Bending, points 30
25
Thermal Diffusivity, mm2/s 6.1
3.3
Thermal Shock Resistance, points 40
28

Alloy Composition

Carbon (C), % 0 to 0.060
0.32 to 0.42
Chromium (Cr), % 10.5 to 12.5
19 to 21
Cobalt (Co), % 0
40 to 49.8
Iron (Fe), % 77.9 to 83.5
0 to 5.0
Manganese (Mn), % 0 to 0.5
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 6.0 to 8.0
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5