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SAE-AISI T8 Steel vs. SAE-AISI T1 Steel

Both SAE-AISI T8 steel and SAE-AISI T1 steel are iron alloys. They have a moderately high 93% 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 T1 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
80
Tensile Strength: Ultimate (UTS), MPa 780 to 2140
770 to 2130

Thermal Properties

Latent Heat of Fusion, J/g 250
240
Melting Completion (Liquidus), °C 1730
1810
Melting Onset (Solidus), °C 1670
1750
Specific Heat Capacity, J/kg-K 420
410
Thermal Conductivity, W/m-K 18
20
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 45
45
Density, g/cm3 9.0
9.3
Embodied Carbon, kg CO2/kg material 10
8.2
Embodied Energy, MJ/kg 160
130
Embodied Water, L/kg 120
90

Common Calculations

PREN (Pitting Resistance) 30
34
Stiffness to Weight: Axial, points 12
12
Stiffness to Weight: Bending, points 22
21
Strength to Weight: Axial, points 24 to 66
23 to 64
Strength to Weight: Bending, points 21 to 41
20 to 40
Thermal Diffusivity, mm2/s 4.8
5.2
Thermal Shock Resistance, points 24 to 66
23 to 64

Alloy Composition

Carbon (C), % 0.75 to 0.85
0.65 to 0.8
Chromium (Cr), % 3.8 to 4.5
3.8 to 4.5
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
73.2 to 77.2
Manganese (Mn), % 0.2 to 0.4
0.1 to 0.4
Molybdenum (Mo), % 0.4 to 1.0
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), % 13.3 to 14.8
17.3 to 18.8
Vanadium (V), % 1.8 to 2.4
0.9 to 1.3

Comparable Variants