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SAE-AISI O2 Steel vs. S21800 Stainless Steel

Both SAE-AISI O2 steel and S21800 stainless steel are iron alloys. They have 65% of their average alloy composition in common. There are 19 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI O2 steel and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
75
Tensile Strength: Ultimate (UTS), MPa 640 to 2050
740

Thermal Properties

Latent Heat of Fusion, J/g 250
340
Melting Completion (Liquidus), °C 1450
1360
Melting Onset (Solidus), °C 1410
1310
Specific Heat Capacity, J/kg-K 470
500
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
15
Density, g/cm3 7.8
7.5
Embodied Carbon, kg CO2/kg material 1.8
3.1
Embodied Energy, MJ/kg 26
45
Embodied Water, L/kg 50
150

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
26
Strength to Weight: Axial, points 23 to 73
27
Strength to Weight: Bending, points 21 to 46
24
Thermal Shock Resistance, points 22 to 70
17

Alloy Composition

Carbon (C), % 0.85 to 1.0
0 to 0.1
Chromium (Cr), % 0 to 0.5
16 to 18
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 95 to 97.8
59.1 to 65.4
Manganese (Mn), % 1.4 to 1.8
7.0 to 9.0
Molybdenum (Mo), % 0 to 0.3
0
Nickel (Ni), % 0 to 0.3
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0 to 0.030
0 to 0.060
Silicon (Si), % 0 to 0.5
3.5 to 4.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0 to 0.3
0