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SAE-AISI O2 Steel vs. R30035 Cobalt

SAE-AISI O2 steel belongs to the iron alloys classification, while R30035 cobalt belongs to the cobalt alloys. There are 23 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI O2 steel and the bottom bar is R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220 to 230
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
84 to 89
Tensile Strength: Ultimate (UTS), MPa 640 to 2050
900 to 1900

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1450
1440
Melting Onset (Solidus), °C 1410
1320
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 43
11
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
100
Density, g/cm3 7.8
8.7
Embodied Carbon, kg CO2/kg material 1.8
10
Embodied Energy, MJ/kg 26
140
Embodied Water, L/kg 50
410

Common Calculations

Stiffness to Weight: Axial, points 13
14 to 15
Stiffness to Weight: Bending, points 24
23 to 24
Strength to Weight: Axial, points 23 to 73
29 to 61
Strength to Weight: Bending, points 21 to 46
24 to 39
Thermal Diffusivity, mm2/s 12
3.0
Thermal Shock Resistance, points 22 to 70
23 to 46

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0.85 to 1.0
0 to 0.025
Chromium (Cr), % 0 to 0.5
19 to 21
Cobalt (Co), % 0
29.1 to 39
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 95 to 97.8
0 to 1.0
Manganese (Mn), % 1.4 to 1.8
0 to 0.15
Molybdenum (Mo), % 0 to 0.3
9.0 to 10.5
Nickel (Ni), % 0 to 0.3
33 to 37
Phosphorus (P), % 0 to 0.030
0 to 0.015
Silicon (Si), % 0 to 0.5
0 to 0.15
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 1.0
Vanadium (V), % 0 to 0.3
0

Comparable Variants