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SAE-AISI T8 Steel vs. SAE-AISI 8740 Steel

Both SAE-AISI T8 steel and SAE-AISI 8740 steel are iron alloys. They have 74% of their average alloy composition in common. There are 21 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI T8 steel and the bottom bar is SAE-AISI 8740 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 78
73
Tensile Strength: Ultimate (UTS), MPa 780 to 2140
580 to 670

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Melting Completion (Liquidus), °C 1730
1460
Melting Onset (Solidus), °C 1670
1420
Specific Heat Capacity, J/kg-K 420
470
Thermal Conductivity, W/m-K 18
39
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 45
2.6
Density, g/cm3 9.0
7.8
Embodied Carbon, kg CO2/kg material 10
1.5
Embodied Energy, MJ/kg 160
20
Embodied Water, L/kg 120
50

Common Calculations

Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 24 to 66
20 to 24
Strength to Weight: Bending, points 21 to 41
20 to 22
Thermal Diffusivity, mm2/s 4.8
10
Thermal Shock Resistance, points 24 to 66
17 to 20

Alloy Composition

Carbon (C), % 0.75 to 0.85
0.38 to 0.43
Chromium (Cr), % 3.8 to 4.5
0.4 to 0.6
Cobalt (Co), % 4.3 to 5.8
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 69.3 to 75.4
96.5 to 97.7
Manganese (Mn), % 0.2 to 0.4
0.75 to 1.0
Molybdenum (Mo), % 0.4 to 1.0
0.2 to 0.3
Nickel (Ni), % 0 to 0.3
0.4 to 0.7
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0.2 to 0.4
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Tungsten (W), % 13.3 to 14.8
0
Vanadium (V), % 1.8 to 2.4
0

Comparable Variants