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ASTM A387 Grade 91 Class 2 vs. SAE-AISI 1008 Steel

Both ASTM A387 grade 91 class 2 and SAE-AISI 1008 steel are iron alloys. They have 89% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, 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 1008 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
93 to 100
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
22 to 33
Fatigue Strength, MPa 330
150 to 220
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
73
Shear Strength, MPa 420
220 to 230
Tensile Strength: Ultimate (UTS), MPa 670
330 to 370
Tensile Strength: Yield (Proof), MPa 470
190 to 310

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 600
400
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 26
62
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
6.9
Electrical Conductivity: Equal Weight (Specific), % IACS 10
7.9

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
1.8
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.6
1.4
Embodied Energy, MJ/kg 37
18
Embodied Water, L/kg 88
45

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
78 to 91
Resilience: Unit (Modulus of Resilience), kJ/m3 580
92 to 260
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24
12 to 13
Strength to Weight: Bending, points 22
13 to 15
Thermal Diffusivity, mm2/s 6.9
17
Thermal Shock Resistance, points 19
10 to 12

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Carbon (C), % 0.080 to 0.12
0 to 0.1
Chromium (Cr), % 8.0 to 9.5
0
Iron (Fe), % 87.3 to 90.3
99.31 to 99.7
Manganese (Mn), % 0.3 to 0.6
0.3 to 0.5
Molybdenum (Mo), % 0.85 to 1.1
0
Nickel (Ni), % 0 to 0.4
0
Niobium (Nb), % 0.060 to 0.1
0
Nitrogen (N), % 0.030 to 0.070
0
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0.2 to 0.5
0
Sulfur (S), % 0 to 0.010
0 to 0.050
Titanium (Ti), % 0 to 0.010
0
Vanadium (V), % 0.18 to 0.25
0
Zirconium (Zr), % 0 to 0.010
0