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SAE-AISI 1008 Steel vs. R30003 Cobalt

SAE-AISI 1008 steel belongs to the iron alloys classification, while R30003 cobalt belongs to the cobalt alloys. There are 27 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 1008 steel and the bottom bar is R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 22 to 33
10 to 73
Fatigue Strength, MPa 150 to 220
320 to 560
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
83
Tensile Strength: Ultimate (UTS), MPa 330 to 370
970 to 1720
Tensile Strength: Yield (Proof), MPa 190 to 310
510 to 1090

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Melting Completion (Liquidus), °C 1470
1400
Melting Onset (Solidus), °C 1430
1440
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 62
13
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 6.9
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 7.9
2.1

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
95
Density, g/cm3 7.9
8.4
Embodied Carbon, kg CO2/kg material 1.4
8.0
Embodied Energy, MJ/kg 18
110
Embodied Water, L/kg 45
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 92 to 260
600 to 2790
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 12 to 13
32 to 57
Strength to Weight: Bending, points 13 to 15
26 to 38
Thermal Diffusivity, mm2/s 17
3.3
Thermal Shock Resistance, points 10 to 12
26 to 45

Alloy Composition

Boron (B), % 0
0 to 0.1
Carbon (C), % 0 to 0.1
0 to 0.15
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
39 to 41
Iron (Fe), % 99.31 to 99.7
10 to 20.5
Manganese (Mn), % 0.3 to 0.5
1.5 to 2.5
Molybdenum (Mo), % 0
6.0 to 8.0
Nickel (Ni), % 0
14 to 16
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0
0 to 1.2
Sulfur (S), % 0 to 0.050
0 to 0.015