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ASTM A387 Grade 91 Class 2 vs. SAE-AISI T8 Steel

Both ASTM A387 grade 91 class 2 and SAE-AISI T8 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 ASTM A387 grade 91 class 2 and the bottom bar is SAE-AISI T8 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
78
Tensile Strength: Ultimate (UTS), MPa 670
780 to 2140

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Melting Completion (Liquidus), °C 1460
1730
Melting Onset (Solidus), °C 1420
1670
Specific Heat Capacity, J/kg-K 470
420
Thermal Conductivity, W/m-K 26
18
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
45
Density, g/cm3 7.8
9.0
Embodied Carbon, kg CO2/kg material 2.6
10
Embodied Energy, MJ/kg 37
160
Embodied Water, L/kg 88
120

Common Calculations

PREN (Pitting Resistance) 13
30
Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 24
24 to 66
Strength to Weight: Bending, points 22
21 to 41
Thermal Diffusivity, mm2/s 6.9
4.8
Thermal Shock Resistance, points 19
24 to 66

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Carbon (C), % 0.080 to 0.12
0.75 to 0.85
Chromium (Cr), % 8.0 to 9.5
3.8 to 4.5
Cobalt (Co), % 0
4.3 to 5.8
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 87.3 to 90.3
69.3 to 75.4
Manganese (Mn), % 0.3 to 0.6
0.2 to 0.4
Molybdenum (Mo), % 0.85 to 1.1
0.4 to 1.0
Nickel (Ni), % 0 to 0.4
0 to 0.3
Niobium (Nb), % 0.060 to 0.1
0
Nitrogen (N), % 0.030 to 0.070
0
Phosphorus (P), % 0 to 0.020
0 to 0.030
Silicon (Si), % 0.2 to 0.5
0.2 to 0.4
Sulfur (S), % 0 to 0.010
0 to 0.030
Titanium (Ti), % 0 to 0.010
0
Tungsten (W), % 0
13.3 to 14.8
Vanadium (V), % 0.18 to 0.25
1.8 to 2.4
Zirconium (Zr), % 0 to 0.010
0