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SAE-AISI 1140 Steel vs. ASTM A387 Grade 91 Class 2

Both SAE-AISI 1140 steel and ASTM A387 grade 91 class 2 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 SAE-AISI 1140 steel and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 180
200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 14 to 18
20
Fatigue Strength, MPa 230 to 370
330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
75
Shear Strength, MPa 370 to 420
420
Tensile Strength: Ultimate (UTS), MPa 600 to 700
670
Tensile Strength: Yield (Proof), MPa 340 to 570
470

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 400
600
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 51
26
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
10

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
7.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
2.6
Embodied Energy, MJ/kg 18
37
Embodied Water, L/kg 46
88

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89 to 93
120
Resilience: Unit (Modulus of Resilience), kJ/m3 310 to 870
580
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 25
24
Strength to Weight: Bending, points 20 to 22
22
Thermal Diffusivity, mm2/s 14
6.9
Thermal Shock Resistance, points 18 to 21
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0.37 to 0.44
0.080 to 0.12
Chromium (Cr), % 0
8.0 to 9.5
Iron (Fe), % 98.4 to 98.9
87.3 to 90.3
Manganese (Mn), % 0.7 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 0
0.85 to 1.1
Nickel (Ni), % 0
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0
0.2 to 0.5
Sulfur (S), % 0.080 to 0.13
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010