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SAE-AISI T8 Steel vs. S40945 Stainless Steel

Both SAE-AISI T8 steel and S40945 stainless steel are iron alloys. They have 77% 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 S40945 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
430

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Melting Completion (Liquidus), °C 1730
1450
Melting Onset (Solidus), °C 1670
1410
Specific Heat Capacity, J/kg-K 420
480
Thermal Conductivity, W/m-K 18
26
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Base Metal Price, % relative 45
8.0
Density, g/cm3 9.0
7.8
Embodied Carbon, kg CO2/kg material 10
2.2
Embodied Energy, MJ/kg 160
31
Embodied Water, L/kg 120
94

Common Calculations

PREN (Pitting Resistance) 30
11
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 24 to 66
15
Strength to Weight: Bending, points 21 to 41
16
Thermal Diffusivity, mm2/s 4.8
6.9
Thermal Shock Resistance, points 24 to 66
15

Alloy Composition

Carbon (C), % 0.75 to 0.85
0 to 0.030
Chromium (Cr), % 3.8 to 4.5
10.5 to 11.7
Cobalt (Co), % 4.3 to 5.8
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 69.3 to 75.4
85.1 to 89.3
Manganese (Mn), % 0.2 to 0.4
0 to 1.0
Molybdenum (Mo), % 0.4 to 1.0
0
Nickel (Ni), % 0 to 0.3
0 to 0.5
Niobium (Nb), % 0
0.18 to 0.4
Nitrogen (N), % 0
0 to 0.030
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
Titanium (Ti), % 0
0.050 to 0.2
Tungsten (W), % 13.3 to 14.8
0
Vanadium (V), % 1.8 to 2.4
0