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SAE-AISI T8 Steel vs. S44800 Stainless Steel

Both SAE-AISI T8 steel and S44800 stainless steel are iron alloys. They have 70% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI T8 steel and the bottom bar is S44800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 78
82
Tensile Strength: Ultimate (UTS), MPa 780 to 2140
590

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Melting Completion (Liquidus), °C 1730
1460
Melting Onset (Solidus), °C 1670
1410
Specific Heat Capacity, J/kg-K 420
480
Thermal Conductivity, W/m-K 18
17
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Base Metal Price, % relative 45
19
Density, g/cm3 9.0
7.8
Embodied Carbon, kg CO2/kg material 10
3.8
Embodied Energy, MJ/kg 160
52
Embodied Water, L/kg 120
190

Common Calculations

PREN (Pitting Resistance) 30
42
Stiffness to Weight: Axial, points 12
15
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 24 to 66
21
Strength to Weight: Bending, points 21 to 41
20
Thermal Diffusivity, mm2/s 4.8
4.6
Thermal Shock Resistance, points 24 to 66
19

Alloy Composition

Carbon (C), % 0.75 to 0.85
0 to 0.010
Chromium (Cr), % 3.8 to 4.5
28 to 30
Cobalt (Co), % 4.3 to 5.8
0
Copper (Cu), % 0 to 0.25
0 to 0.15
Iron (Fe), % 69.3 to 75.4
62.6 to 66.5
Manganese (Mn), % 0.2 to 0.4
0 to 0.3
Molybdenum (Mo), % 0.4 to 1.0
3.5 to 4.2
Nickel (Ni), % 0 to 0.3
2.0 to 2.5
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0.2 to 0.4
0 to 0.2
Sulfur (S), % 0 to 0.030
0 to 0.020
Tungsten (W), % 13.3 to 14.8
0
Vanadium (V), % 1.8 to 2.4
0