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SAE-AISI T8 Steel vs. ASTM Grade HP Steel

Both SAE-AISI T8 steel and ASTM grade HP steel are iron alloys. They have 42% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 78
78
Tensile Strength: Ultimate (UTS), MPa 780 to 2140
490

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1730
1370
Melting Onset (Solidus), °C 1670
1330
Specific Heat Capacity, J/kg-K 420
480
Thermal Conductivity, W/m-K 18
12
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 45
34
Density, g/cm3 9.0
7.9
Embodied Carbon, kg CO2/kg material 10
5.8
Embodied Energy, MJ/kg 160
82
Embodied Water, L/kg 120
220

Common Calculations

PREN (Pitting Resistance) 30
27
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 24 to 66
17
Strength to Weight: Bending, points 21 to 41
17
Thermal Diffusivity, mm2/s 4.8
3.2
Thermal Shock Resistance, points 24 to 66
11

Alloy Composition

Carbon (C), % 0.75 to 0.85
0.35 to 0.75
Chromium (Cr), % 3.8 to 4.5
24 to 28
Cobalt (Co), % 4.3 to 5.8
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 69.3 to 75.4
29.2 to 42.7
Manganese (Mn), % 0.2 to 0.4
0 to 2.0
Molybdenum (Mo), % 0.4 to 1.0
0 to 0.5
Nickel (Ni), % 0 to 0.3
33 to 37
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.4
0 to 2.5
Sulfur (S), % 0 to 0.030
0 to 0.040
Tungsten (W), % 13.3 to 14.8
0
Vanadium (V), % 1.8 to 2.4
0