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SAE-AISI T8 Steel vs. AISI 440A Stainless Steel

Both SAE-AISI T8 steel and AISI 440A 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 (9, 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 440A 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
730 to 1790

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Melting Completion (Liquidus), °C 1730
1480
Melting Onset (Solidus), °C 1670
1370
Specific Heat Capacity, J/kg-K 420
480
Thermal Conductivity, W/m-K 18
23
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Base Metal Price, % relative 45
9.0
Density, g/cm3 9.0
7.7
Embodied Carbon, kg CO2/kg material 10
2.2
Embodied Energy, MJ/kg 160
31
Embodied Water, L/kg 120
120

Common Calculations

PREN (Pitting Resistance) 30
18
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 24 to 66
26 to 65
Strength to Weight: Bending, points 21 to 41
23 to 43
Thermal Diffusivity, mm2/s 4.8
6.2
Thermal Shock Resistance, points 24 to 66
26 to 65

Alloy Composition

Carbon (C), % 0.75 to 0.85
0.6 to 0.75
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
78.4 to 83.4
Manganese (Mn), % 0.2 to 0.4
0 to 1.0
Molybdenum (Mo), % 0.4 to 1.0
0 to 0.75
Nickel (Ni), % 0 to 0.3
0
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 0.015
Tungsten (W), % 13.3 to 14.8
0
Vanadium (V), % 1.8 to 2.4
0

Comparable Variants