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SAE-AISI A8 Steel vs. R31233 Cobalt

SAE-AISI A8 steel belongs to the iron alloys classification, while R31233 cobalt belongs to the cobalt alloys. There are 22 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 SAE-AISI A8 steel and the bottom bar is R31233 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
85
Tensile Strength: Ultimate (UTS), MPa 700 to 1920
1020

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1480
1350
Melting Onset (Solidus), °C 1430
1330
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 37
12
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.3
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 9.5
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.9
8.6
Embodied Carbon, kg CO2/kg material 2.3
8.4
Embodied Energy, MJ/kg 31
110
Embodied Water, L/kg 73
480

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 25 to 68
33
Strength to Weight: Bending, points 22 to 44
26
Thermal Diffusivity, mm2/s 9.9
3.2
Thermal Shock Resistance, points 22 to 62
25

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0.5 to 0.6
0.020 to 0.1
Chromium (Cr), % 4.8 to 5.5
23.5 to 27.5
Cobalt (Co), % 0
44.7 to 63.3
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 88.5 to 91.9
1.0 to 5.0
Manganese (Mn), % 0 to 0.5
0.1 to 1.5
Molybdenum (Mo), % 1.2 to 1.7
4.0 to 6.0
Nickel (Ni), % 0 to 0.3
7.0 to 11
Nitrogen (N), % 0
0.030 to 0.12
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.75 to 1.1
0.050 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.020
Tungsten (W), % 1.0 to 1.5
1.0 to 3.0