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SAE-AISI S4 Steel vs. SAE-AISI T8 Steel

Both SAE-AISI S4 steel and SAE-AISI T8 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 (3, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI S4 steel and the bottom bar is SAE-AISI T8 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
78
Tensile Strength: Ultimate (UTS), MPa 670 to 2140
780 to 2140

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Melting Completion (Liquidus), °C 1430
1730
Melting Onset (Solidus), °C 1390
1670
Specific Heat Capacity, J/kg-K 480
420
Thermal Conductivity, W/m-K 44
18
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 2.2
45
Density, g/cm3 7.7
9.0
Embodied Carbon, kg CO2/kg material 2.0
10
Embodied Energy, MJ/kg 29
160
Embodied Water, L/kg 48
120

Common Calculations

Stiffness to Weight: Axial, points 13
12
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 24 to 77
24 to 66
Strength to Weight: Bending, points 22 to 48
21 to 41
Thermal Diffusivity, mm2/s 12
4.8
Thermal Shock Resistance, points 20 to 65
24 to 66

Alloy Composition

Carbon (C), % 0.5 to 0.65
0.75 to 0.85
Chromium (Cr), % 0.1 to 0.5
3.8 to 4.5
Cobalt (Co), % 0
4.3 to 5.8
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 95.2 to 96.9
69.3 to 75.4
Manganese (Mn), % 0.6 to 1.0
0.2 to 0.4
Molybdenum (Mo), % 0
0.4 to 1.0
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 1.8 to 2.3
0.2 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
13.3 to 14.8
Vanadium (V), % 0.15 to 0.35
1.8 to 2.4

Comparable Variants