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SAE-AISI O6 Steel vs. S21904 Stainless Steel

Both SAE-AISI O6 steel and S21904 stainless steel are iron alloys. They have 65% 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 O6 steel and the bottom bar is S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 71
78
Tensile Strength: Ultimate (UTS), MPa 670 to 2070
700 to 1000

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Melting Completion (Liquidus), °C 1430
1400
Melting Onset (Solidus), °C 1390
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 43
14
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
15
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 1.5
3.0
Embodied Energy, MJ/kg 21
43
Embodied Water, L/kg 47
160

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24 to 74
25 to 36
Strength to Weight: Bending, points 22 to 47
23 to 29
Thermal Diffusivity, mm2/s 12
3.8
Thermal Shock Resistance, points 22 to 69
15 to 21

Alloy Composition

Carbon (C), % 1.3 to 1.6
0 to 0.040
Chromium (Cr), % 0 to 0.3
19 to 21.5
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 94.6 to 97.7
59.5 to 67.4
Manganese (Mn), % 0.3 to 1.1
8.0 to 10
Molybdenum (Mo), % 0.2 to 0.3
0
Nickel (Ni), % 0 to 0.3
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.55 to 1.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030

Comparable Variants