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SAE-AISI O2 Steel vs. S31266 Stainless Steel

Both SAE-AISI O2 steel and S31266 stainless steel are iron alloys. They have 43% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI O2 steel and the bottom bar is S31266 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
81
Tensile Strength: Ultimate (UTS), MPa 640 to 2050
860

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Melting Completion (Liquidus), °C 1450
1470
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
460
Thermal Conductivity, W/m-K 43
12
Thermal Expansion, µm/m-K 11
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.0

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
37
Density, g/cm3 7.8
8.2
Embodied Carbon, kg CO2/kg material 1.8
6.5
Embodied Energy, MJ/kg 26
89
Embodied Water, L/kg 50
220

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23 to 73
29
Strength to Weight: Bending, points 21 to 46
24
Thermal Diffusivity, mm2/s 12
3.1
Thermal Shock Resistance, points 22 to 70
18

Alloy Composition

Carbon (C), % 0.85 to 1.0
0 to 0.030
Chromium (Cr), % 0 to 0.5
23 to 25
Copper (Cu), % 0 to 0.25
1.0 to 2.5
Iron (Fe), % 95 to 97.8
34.1 to 46
Manganese (Mn), % 1.4 to 1.8
2.0 to 4.0
Molybdenum (Mo), % 0 to 0.3
5.2 to 6.2
Nickel (Ni), % 0 to 0.3
21 to 24
Nitrogen (N), % 0
0.35 to 0.6
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.020
Tungsten (W), % 0
1.5 to 2.5
Vanadium (V), % 0 to 0.3
0