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SAE-AISI T8 Steel vs. ASTM A387 Grade 9 Steel

Both SAE-AISI T8 steel and ASTM A387 grade 9 steel are iron alloys. They have 78% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (10, 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 A387 grade 9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 78
75
Tensile Strength: Ultimate (UTS), MPa 780 to 2140
500 to 600

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Melting Completion (Liquidus), °C 1730
1460
Melting Onset (Solidus), °C 1670
1410
Specific Heat Capacity, J/kg-K 420
470
Thermal Conductivity, W/m-K 18
26
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 45
6.5
Density, g/cm3 9.0
7.8
Embodied Carbon, kg CO2/kg material 10
2.1
Embodied Energy, MJ/kg 160
28
Embodied Water, L/kg 120
87

Common Calculations

PREN (Pitting Resistance) 30
12
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 24 to 66
18 to 21
Strength to Weight: Bending, points 21 to 41
18 to 20
Thermal Diffusivity, mm2/s 4.8
6.9
Thermal Shock Resistance, points 24 to 66
14 to 17

Alloy Composition

Carbon (C), % 0.75 to 0.85
0 to 0.15
Chromium (Cr), % 3.8 to 4.5
8.0 to 10
Cobalt (Co), % 4.3 to 5.8
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 69.3 to 75.4
87.1 to 90.8
Manganese (Mn), % 0.2 to 0.4
0.3 to 0.6
Molybdenum (Mo), % 0.4 to 1.0
0.9 to 1.1
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0.2 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.025
Tungsten (W), % 13.3 to 14.8
0
Vanadium (V), % 1.8 to 2.4
0 to 0.040

Comparable Variants