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SAE-AISI T8 Steel vs. S21800 Stainless Steel

Both SAE-AISI T8 steel and S21800 stainless steel are iron alloys. They have 67% of their average alloy composition in common. There are 20 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 S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 78
75
Tensile Strength: Ultimate (UTS), MPa 780 to 2140
740

Thermal Properties

Latent Heat of Fusion, J/g 250
340
Melting Completion (Liquidus), °C 1730
1360
Melting Onset (Solidus), °C 1670
1310
Specific Heat Capacity, J/kg-K 420
500
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 45
15
Density, g/cm3 9.0
7.5
Embodied Carbon, kg CO2/kg material 10
3.1
Embodied Energy, MJ/kg 160
45
Embodied Water, L/kg 120
150

Common Calculations

PREN (Pitting Resistance) 30
19
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 22
26
Strength to Weight: Axial, points 24 to 66
27
Strength to Weight: Bending, points 21 to 41
24
Thermal Shock Resistance, points 24 to 66
17

Alloy Composition

Carbon (C), % 0.75 to 0.85
0 to 0.1
Chromium (Cr), % 3.8 to 4.5
16 to 18
Cobalt (Co), % 4.3 to 5.8
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 69.3 to 75.4
59.1 to 65.4
Manganese (Mn), % 0.2 to 0.4
7.0 to 9.0
Molybdenum (Mo), % 0.4 to 1.0
0
Nickel (Ni), % 0 to 0.3
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0 to 0.030
0 to 0.060
Silicon (Si), % 0.2 to 0.4
3.5 to 4.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 13.3 to 14.8
0
Vanadium (V), % 1.8 to 2.4
0