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SAE-AISI T8 Steel vs. AISI 418 Stainless Steel

Both SAE-AISI T8 steel and AISI 418 stainless steel are iron alloys. They have 81% 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 SAE-AISI T8 steel and the bottom bar is AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 78
77
Tensile Strength: Ultimate (UTS), MPa 780 to 2140
1100

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Melting Completion (Liquidus), °C 1730
1500
Melting Onset (Solidus), °C 1670
1460
Specific Heat Capacity, J/kg-K 420
470
Thermal Conductivity, W/m-K 18
25
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Base Metal Price, % relative 45
15
Density, g/cm3 9.0
8.0
Embodied Carbon, kg CO2/kg material 10
2.9
Embodied Energy, MJ/kg 160
41
Embodied Water, L/kg 120
110

Common Calculations

PREN (Pitting Resistance) 30
19
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 24 to 66
38
Strength to Weight: Bending, points 21 to 41
29
Thermal Diffusivity, mm2/s 4.8
6.7
Thermal Shock Resistance, points 24 to 66
40

Alloy Composition

Carbon (C), % 0.75 to 0.85
0.15 to 0.2
Chromium (Cr), % 3.8 to 4.5
12 to 14
Cobalt (Co), % 4.3 to 5.8
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 69.3 to 75.4
78.5 to 83.6
Manganese (Mn), % 0.2 to 0.4
0 to 0.5
Molybdenum (Mo), % 0.4 to 1.0
0 to 0.5
Nickel (Ni), % 0 to 0.3
1.8 to 2.2
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.4
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 13.3 to 14.8
2.5 to 3.5
Vanadium (V), % 1.8 to 2.4
0