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SAE-AISI O1 Steel vs. S82121 Stainless Steel

Both SAE-AISI O1 steel and S82121 stainless steel are iron alloys. They have 73% 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 O1 steel and the bottom bar is S82121 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
78
Tensile Strength: Ultimate (UTS), MPa 640 to 2060
730

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 43
15
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 3.4
14
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.9
2.8
Embodied Energy, MJ/kg 27
40
Embodied Water, L/kg 51
150

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23 to 73
26
Strength to Weight: Bending, points 21 to 46
23
Thermal Diffusivity, mm2/s 12
4.0
Thermal Shock Resistance, points 21 to 68
20

Alloy Composition

Carbon (C), % 0.85 to 1.0
0 to 0.035
Chromium (Cr), % 0.4 to 0.6
21 to 23
Copper (Cu), % 0 to 0.25
0.2 to 1.2
Iron (Fe), % 95 to 97.4
66.7 to 75.4
Manganese (Mn), % 1.0 to 1.4
1.0 to 2.5
Molybdenum (Mo), % 0
0.3 to 1.3
Nickel (Ni), % 0 to 0.3
2.0 to 4.0
Nitrogen (N), % 0
0.15 to 0.25
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.010
Tungsten (W), % 0.4 to 0.6
0
Vanadium (V), % 0 to 0.3
0