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SAE-AISI T8 Steel vs. SAE-AISI T15 Steel

Both SAE-AISI T8 steel and SAE-AISI T15 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 T8 steel and the bottom bar is SAE-AISI T15 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 78
76
Tensile Strength: Ultimate (UTS), MPa 780 to 2140
830 to 2240

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Melting Completion (Liquidus), °C 1730
1690
Melting Onset (Solidus), °C 1670
1640
Specific Heat Capacity, J/kg-K 420
430
Thermal Conductivity, W/m-K 18
21
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 45
43
Density, g/cm3 9.0
8.7
Embodied Carbon, kg CO2/kg material 10
16
Embodied Energy, MJ/kg 160
250
Embodied Water, L/kg 120
140

Common Calculations

PREN (Pitting Resistance) 30
27
Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 22
22
Strength to Weight: Axial, points 24 to 66
26 to 71
Strength to Weight: Bending, points 21 to 41
22 to 43
Thermal Diffusivity, mm2/s 4.8
5.6
Thermal Shock Resistance, points 24 to 66
26 to 70

Alloy Composition

Carbon (C), % 0.75 to 0.85
1.5 to 1.6
Chromium (Cr), % 3.8 to 4.5
3.8 to 5.0
Cobalt (Co), % 4.3 to 5.8
4.8 to 5.3
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 69.3 to 75.4
67.5 to 73.5
Manganese (Mn), % 0.2 to 0.4
0.15 to 0.4
Molybdenum (Mo), % 0.4 to 1.0
0 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
0.15 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 13.3 to 14.8
11.8 to 13
Vanadium (V), % 1.8 to 2.4
4.5 to 5.3

Comparable Variants