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S21900 Stainless Steel vs. SAE-AISI O6 Steel

Both S21900 stainless steel and SAE-AISI O6 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 (11, in this case) are not shown.

For each property being compared, the top bar is S21900 stainless steel and the bottom bar is SAE-AISI O6 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
180
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
71
Tensile Strength: Ultimate (UTS), MPa 710
670 to 2070

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 26
24 to 74
Strength to Weight: Bending, points 23
22 to 47
Thermal Diffusivity, mm2/s 3.8
12
Thermal Shock Resistance, points 15
22 to 69

Alloy Composition

Carbon (C), % 0 to 0.080
1.3 to 1.6
Chromium (Cr), % 19 to 21.5
0 to 0.3
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 59.4 to 67.4
94.6 to 97.7
Manganese (Mn), % 8.0 to 10
0.3 to 1.1
Molybdenum (Mo), % 0
0.2 to 0.3
Nickel (Ni), % 5.5 to 7.5
0 to 0.3
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0 to 0.030
Silicon (Si), % 0 to 1.0
0.55 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.030