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SAE-AISI O1 Steel vs. SAE-AISI O2 Steel

Both SAE-AISI O1 steel and SAE-AISI O2 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is SAE-AISI O1 steel and the bottom bar is SAE-AISI O2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
72
Tensile Strength: Ultimate (UTS), MPa 640 to 2060
640 to 2050

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 43
43
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 3.4
2.4
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.9
1.8
Embodied Energy, MJ/kg 27
26
Embodied Water, L/kg 51
50

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23 to 73
23 to 73
Strength to Weight: Bending, points 21 to 46
21 to 46
Thermal Diffusivity, mm2/s 12
12
Thermal Shock Resistance, points 21 to 68
22 to 70

Alloy Composition

Carbon (C), % 0.85 to 1.0
0.85 to 1.0
Chromium (Cr), % 0.4 to 0.6
0 to 0.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 95 to 97.4
95 to 97.8
Manganese (Mn), % 1.0 to 1.4
1.4 to 1.8
Molybdenum (Mo), % 0
0 to 0.3
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0.4 to 0.6
0
Vanadium (V), % 0 to 0.3
0 to 0.3

Comparable Variants