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SAE-AISI T8 Steel vs. S31266 Stainless Steel

Both SAE-AISI T8 steel and S31266 stainless steel are iron alloys. They have 48% of their average alloy composition in common. There are 22 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 T8 steel and the bottom bar is S31266 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 78
81
Tensile Strength: Ultimate (UTS), MPa 780 to 2140
860

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Melting Completion (Liquidus), °C 1730
1470
Melting Onset (Solidus), °C 1670
1420
Specific Heat Capacity, J/kg-K 420
460
Thermal Conductivity, W/m-K 18
12
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 45
37
Density, g/cm3 9.0
8.2
Embodied Carbon, kg CO2/kg material 10
6.5
Embodied Energy, MJ/kg 160
89
Embodied Water, L/kg 120
220

Common Calculations

PREN (Pitting Resistance) 30
54
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 24 to 66
29
Strength to Weight: Bending, points 21 to 41
24
Thermal Diffusivity, mm2/s 4.8
3.1
Thermal Shock Resistance, points 24 to 66
18

Alloy Composition

Carbon (C), % 0.75 to 0.85
0 to 0.030
Chromium (Cr), % 3.8 to 4.5
23 to 25
Cobalt (Co), % 4.3 to 5.8
0
Copper (Cu), % 0 to 0.25
1.0 to 2.5
Iron (Fe), % 69.3 to 75.4
34.1 to 46
Manganese (Mn), % 0.2 to 0.4
2.0 to 4.0
Molybdenum (Mo), % 0.4 to 1.0
5.2 to 6.2
Nickel (Ni), % 0 to 0.3
21 to 24
Nitrogen (N), % 0
0.35 to 0.6
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0.2 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.020
Tungsten (W), % 13.3 to 14.8
1.5 to 2.5
Vanadium (V), % 1.8 to 2.4
0