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SAE-AISI T8 Steel vs. SAE-AISI A8 Steel

Both SAE-AISI T8 steel and SAE-AISI A8 steel are iron alloys. They have 80% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (2, 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 A8 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
74
Tensile Strength: Ultimate (UTS), MPa 780 to 2140
700 to 1920

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Melting Completion (Liquidus), °C 1730
1480
Melting Onset (Solidus), °C 1670
1430
Specific Heat Capacity, J/kg-K 420
470
Thermal Conductivity, W/m-K 18
37
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 45
8.5
Density, g/cm3 9.0
7.9
Embodied Carbon, kg CO2/kg material 10
2.3
Embodied Energy, MJ/kg 160
31
Embodied Water, L/kg 120
73

Common Calculations

PREN (Pitting Resistance) 30
12
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 24 to 66
25 to 68
Strength to Weight: Bending, points 21 to 41
22 to 44
Thermal Diffusivity, mm2/s 4.8
9.9
Thermal Shock Resistance, points 24 to 66
22 to 62

Alloy Composition

Carbon (C), % 0.75 to 0.85
0.5 to 0.6
Chromium (Cr), % 3.8 to 4.5
4.8 to 5.5
Cobalt (Co), % 4.3 to 5.8
0
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 69.3 to 75.4
88.5 to 91.9
Manganese (Mn), % 0.2 to 0.4
0 to 0.5
Molybdenum (Mo), % 0.4 to 1.0
1.2 to 1.7
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
0.75 to 1.1
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 13.3 to 14.8
1.0 to 1.5
Vanadium (V), % 1.8 to 2.4
0

Comparable Variants