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ASTM Grade HD Steel vs. SAE-AISI T8 Steel

Both ASTM grade HD steel and SAE-AISI T8 steel are iron alloys. They have 70% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 80
78
Tensile Strength: Ultimate (UTS), MPa 590
780 to 2140

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Melting Completion (Liquidus), °C 1410
1730
Melting Onset (Solidus), °C 1370
1670
Specific Heat Capacity, J/kg-K 490
420
Thermal Conductivity, W/m-K 16
18
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Base Metal Price, % relative 17
45
Density, g/cm3 7.7
9.0
Embodied Carbon, kg CO2/kg material 3.1
10
Embodied Energy, MJ/kg 45
160
Embodied Water, L/kg 180
120

Common Calculations

PREN (Pitting Resistance) 29
30
Stiffness to Weight: Axial, points 15
12
Stiffness to Weight: Bending, points 26
22
Strength to Weight: Axial, points 21
24 to 66
Strength to Weight: Bending, points 20
21 to 41
Thermal Diffusivity, mm2/s 4.3
4.8
Thermal Shock Resistance, points 19
24 to 66

Alloy Composition

Carbon (C), % 0 to 0.5
0.75 to 0.85
Chromium (Cr), % 26 to 30
3.8 to 4.5
Cobalt (Co), % 0
4.3 to 5.8
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 58.4 to 70
69.3 to 75.4
Manganese (Mn), % 0 to 1.5
0.2 to 0.4
Molybdenum (Mo), % 0 to 0.5
0.4 to 1.0
Nickel (Ni), % 4.0 to 7.0
0 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 2.0
0.2 to 0.4
Sulfur (S), % 0 to 0.040
0 to 0.030
Tungsten (W), % 0
13.3 to 14.8
Vanadium (V), % 0
1.8 to 2.4