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ACI-ASTM CB6 Steel vs. R31539 Cobalt

ACI-ASTM CB6 steel belongs to the iron alloys classification, while R31539 cobalt belongs to the cobalt alloys. There are 28 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CB6 steel and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 18
13 to 22
Fatigue Strength, MPa 410
310 to 480
Poisson's Ratio 0.28
0.29
Reduction in Area, % 40
13 to 23
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 880
1000 to 1340
Tensile Strength: Yield (Proof), MPa 660
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1440
1360
Melting Onset (Solidus), °C 1390
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 17
13
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 2.5
8.2
Embodied Energy, MJ/kg 36
110
Embodied Water, L/kg 130
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
140 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
780 to 2000
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 32
33 to 44
Strength to Weight: Bending, points 26
27 to 32
Thermal Diffusivity, mm2/s 4.6
3.5
Thermal Shock Resistance, points 31
24 to 32

Alloy Composition

Aluminum (Al), % 0
0.3 to 1.0
Carbon (C), % 0 to 0.060
0 to 0.14
Chromium (Cr), % 15.5 to 17.5
26 to 30
Cobalt (Co), % 0
57.7 to 68.7
Iron (Fe), % 74.4 to 81
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
5.0 to 7.0
Nickel (Ni), % 3.5 to 5.5
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0