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SAE-AISI A8 Steel vs. R30605 Cobalt

SAE-AISI A8 steel belongs to the iron alloys classification, while R30605 cobalt belongs to the cobalt alloys. There are 22 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 SAE-AISI A8 steel and the bottom bar is R30605 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
81
Tensile Strength: Ultimate (UTS), MPa 700 to 1920
1130 to 1900

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Melting Completion (Liquidus), °C 1480
1410
Melting Onset (Solidus), °C 1430
1330
Specific Heat Capacity, J/kg-K 470
410
Thermal Conductivity, W/m-K 37
9.6
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.3
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 9.5
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.9
9.6
Embodied Carbon, kg CO2/kg material 2.3
9.8
Embodied Energy, MJ/kg 31
140
Embodied Water, L/kg 73
450

Common Calculations

Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 24
21
Strength to Weight: Axial, points 25 to 68
33 to 55
Strength to Weight: Bending, points 22 to 44
25 to 36
Thermal Diffusivity, mm2/s 9.9
2.5
Thermal Shock Resistance, points 22 to 62
31 to 52

Alloy Composition

Carbon (C), % 0.5 to 0.6
0.050 to 0.15
Chromium (Cr), % 4.8 to 5.5
19 to 21
Cobalt (Co), % 0
46.4 to 57
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 88.5 to 91.9
0 to 3.0
Manganese (Mn), % 0 to 0.5
1.0 to 2.0
Molybdenum (Mo), % 1.2 to 1.7
0
Nickel (Ni), % 0 to 0.3
9.0 to 11
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.75 to 1.1
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.0 to 1.5
14 to 16

Comparable Variants