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SAE-AISI O2 Steel vs. R30008 Cobalt

SAE-AISI O2 steel belongs to the iron alloys classification, while R30008 cobalt belongs to the cobalt alloys. There are 19 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI O2 steel and the bottom bar is R30008 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 72
83
Tensile Strength: Ultimate (UTS), MPa 640 to 2050
950 to 1700

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1450
1400
Melting Onset (Solidus), °C 1410
1330
Specific Heat Capacity, J/kg-K 470
450
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
95
Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 1.8
8.1
Embodied Energy, MJ/kg 26
110
Embodied Water, L/kg 50
400

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23 to 73
31 to 56
Strength to Weight: Bending, points 21 to 46
25 to 37
Thermal Shock Resistance, points 22 to 70
25 to 44

Alloy Composition

Boron (B), % 0
0 to 0.0010
Carbon (C), % 0.85 to 1.0
0 to 0.15
Chromium (Cr), % 0 to 0.5
18.5 to 21.5
Cobalt (Co), % 0
39 to 42
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 95 to 97.8
7.6 to 20
Manganese (Mn), % 1.4 to 1.8
1.0 to 2.0
Molybdenum (Mo), % 0 to 0.3
6.5 to 7.5
Nickel (Ni), % 0 to 0.3
15 to 18
Phosphorus (P), % 0 to 0.030
0 to 0.015
Silicon (Si), % 0 to 0.5
0 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.015
Vanadium (V), % 0 to 0.3
0

Comparable Variants