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SAE-AISI O2 Steel vs. S44725 Stainless Steel

Both SAE-AISI O2 steel and S44725 stainless steel are iron alloys. They have 71% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI O2 steel and the bottom bar is S44725 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 72
81
Tensile Strength: Ultimate (UTS), MPa 640 to 2050
500

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Melting Completion (Liquidus), °C 1450
1450
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 43
17
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
15
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.8
3.1
Embodied Energy, MJ/kg 26
44
Embodied Water, L/kg 50
170

Common Calculations

Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23 to 73
18
Strength to Weight: Bending, points 21 to 46
18
Thermal Diffusivity, mm2/s 12
4.6
Thermal Shock Resistance, points 22 to 70
16

Alloy Composition

Carbon (C), % 0.85 to 1.0
0 to 0.015
Chromium (Cr), % 0 to 0.5
25 to 28.5
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 95 to 97.8
67.6 to 73.5
Manganese (Mn), % 1.4 to 1.8
0 to 0.4
Molybdenum (Mo), % 0 to 0.3
1.5 to 2.5
Nickel (Ni), % 0 to 0.3
0 to 0.3
Niobium (Nb), % 0
0 to 0.26
Nitrogen (N), % 0
0 to 0.018
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 0.040
Sulfur (S), % 0 to 0.030
0 to 0.020
Titanium (Ti), % 0
0 to 0.26
Vanadium (V), % 0 to 0.3
0