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SAE-AISI T8 Steel vs. AISI 420 Stainless Steel

Both SAE-AISI T8 steel and AISI 420 stainless steel are iron alloys. They have 78% 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 420 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
76
Tensile Strength: Ultimate (UTS), MPa 780 to 2140
690 to 1720

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Melting Completion (Liquidus), °C 1730
1510
Melting Onset (Solidus), °C 1670
1450
Specific Heat Capacity, J/kg-K 420
480
Thermal Conductivity, W/m-K 18
27
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Base Metal Price, % relative 45
7.5
Density, g/cm3 9.0
7.7
Embodied Carbon, kg CO2/kg material 10
2.0
Embodied Energy, MJ/kg 160
28
Embodied Water, L/kg 120
100

Common Calculations

PREN (Pitting Resistance) 30
14
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 24 to 66
25 to 62
Strength to Weight: Bending, points 21 to 41
22 to 41
Thermal Diffusivity, mm2/s 4.8
7.3
Thermal Shock Resistance, points 24 to 66
25 to 62

Alloy Composition

Carbon (C), % 0.75 to 0.85
0.15 to 0.4
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
82.3 to 87.9
Manganese (Mn), % 0.2 to 0.4
0 to 1.0
Molybdenum (Mo), % 0.4 to 1.0
0 to 0.5
Nickel (Ni), % 0 to 0.3
0 to 0.75
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.4
0 to 1.0
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

Comparable Variants