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SAE-AISI T4 Steel vs. SAE-AISI T8 Steel

Both SAE-AISI T4 steel and SAE-AISI T8 steel are iron alloys. They have a very high 96% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI T4 steel and the bottom bar is SAE-AISI T8 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 80
78
Tensile Strength: Ultimate (UTS), MPa 800 to 2140
780 to 2140

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Melting Completion (Liquidus), °C 1810
1730
Melting Onset (Solidus), °C 1750
1670
Specific Heat Capacity, J/kg-K 410
420
Thermal Conductivity, W/m-K 21
18
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 55
45
Density, g/cm3 9.4
9.0
Embodied Carbon, kg CO2/kg material 8.5
10
Embodied Energy, MJ/kg 130
160
Embodied Water, L/kg 120
120

Common Calculations

PREN (Pitting Resistance) 37
30
Stiffness to Weight: Axial, points 12
12
Stiffness to Weight: Bending, points 21
22
Strength to Weight: Axial, points 24 to 64
24 to 66
Strength to Weight: Bending, points 20 to 39
21 to 41
Thermal Diffusivity, mm2/s 5.4
4.8
Thermal Shock Resistance, points 24 to 64
24 to 66

Alloy Composition

Carbon (C), % 0.7 to 0.8
0.75 to 0.85
Chromium (Cr), % 3.8 to 4.5
3.8 to 4.5
Cobalt (Co), % 4.3 to 5.8
4.3 to 5.8
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 66.3 to 72.3
69.3 to 75.4
Manganese (Mn), % 0.1 to 0.4
0.2 to 0.4
Molybdenum (Mo), % 0.4 to 1.0
0.4 to 1.0
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.2 to 0.4
0.2 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 17.5 to 19
13.3 to 14.8
Vanadium (V), % 0.8 to 1.2
1.8 to 2.4

Comparable Variants