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SAE-AISI 1008 Steel vs. R30001 Cobalt

SAE-AISI 1008 steel belongs to the iron alloys classification, while R30001 cobalt belongs to the cobalt alloys. There are 23 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1008 steel and the bottom bar is R30001 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 22 to 33
1.0
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
86
Tensile Strength: Ultimate (UTS), MPa 330 to 370
620

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Melting Completion (Liquidus), °C 1470
1530
Melting Onset (Solidus), °C 1430
1260
Specific Heat Capacity, J/kg-K 470
430
Thermal Conductivity, W/m-K 62
15
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 6.9
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 7.9
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.9
9.0
Embodied Carbon, kg CO2/kg material 1.4
8.9
Embodied Energy, MJ/kg 18
130
Embodied Water, L/kg 45
460

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 12 to 13
19
Strength to Weight: Bending, points 13 to 15
18
Thermal Diffusivity, mm2/s 17
3.7
Thermal Shock Resistance, points 10 to 12
19

Alloy Composition

Carbon (C), % 0 to 0.1
2.0 to 3.0
Chromium (Cr), % 0
28 to 32
Cobalt (Co), % 0
43 to 59
Iron (Fe), % 99.31 to 99.7
0 to 3.0
Manganese (Mn), % 0.3 to 0.5
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0
0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0
0 to 2.0
Sulfur (S), % 0 to 0.050
0
Tungsten (W), % 0
11 to 13