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S31655 Stainless Steel vs. SAE-AISI T8 Steel

Both S31655 stainless steel and SAE-AISI T8 steel are iron alloys. They have 73% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is S31655 stainless steel and the bottom bar is SAE-AISI T8 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
78
Tensile Strength: Ultimate (UTS), MPa 710
780 to 2140

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Melting Completion (Liquidus), °C 1430
1730
Melting Onset (Solidus), °C 1380
1670
Specific Heat Capacity, J/kg-K 480
420
Thermal Conductivity, W/m-K 15
18
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Base Metal Price, % relative 17
45
Density, g/cm3 7.8
9.0
Embodied Carbon, kg CO2/kg material 3.3
10
Embodied Energy, MJ/kg 46
160
Embodied Water, L/kg 160
120

Common Calculations

PREN (Pitting Resistance) 27
30
Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 25
24 to 66
Strength to Weight: Bending, points 23
21 to 41
Thermal Diffusivity, mm2/s 4.0
4.8
Thermal Shock Resistance, points 16
24 to 66

Alloy Composition

Carbon (C), % 0 to 0.030
0.75 to 0.85
Chromium (Cr), % 19.5 to 21.5
3.8 to 4.5
Cobalt (Co), % 0
4.3 to 5.8
Copper (Cu), % 0 to 1.0
0 to 0.25
Iron (Fe), % 63.2 to 71.9
69.3 to 75.4
Manganese (Mn), % 0 to 2.0
0.2 to 0.4
Molybdenum (Mo), % 0.5 to 1.5
0.4 to 1.0
Nickel (Ni), % 8.0 to 9.5
0 to 0.3
Nitrogen (N), % 0.14 to 0.25
0
Phosphorus (P), % 0 to 0.045
0 to 0.030
Silicon (Si), % 0 to 1.0
0.2 to 0.4
Sulfur (S), % 0 to 0.015
0 to 0.030
Tungsten (W), % 0
13.3 to 14.8
Vanadium (V), % 0
1.8 to 2.4