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SAE-AISI 1140 Steel vs. ACI-ASTM CD6MN Steel

Both SAE-AISI 1140 steel and ACI-ASTM CD6MN steel are iron alloys. They have 67% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1140 steel and the bottom bar is ACI-ASTM CD6MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 14 to 18
28
Fatigue Strength, MPa 230 to 370
370
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 72
80
Tensile Strength: Ultimate (UTS), MPa 600 to 700
730
Tensile Strength: Yield (Proof), MPa 340 to 570
510

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 400
1100
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 51
16
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
17
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.4
3.4
Embodied Energy, MJ/kg 18
48
Embodied Water, L/kg 46
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89 to 93
180
Resilience: Unit (Modulus of Resilience), kJ/m3 310 to 870
650
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 25
26
Strength to Weight: Bending, points 20 to 22
23
Thermal Diffusivity, mm2/s 14
4.4
Thermal Shock Resistance, points 18 to 21
20

Alloy Composition

Carbon (C), % 0.37 to 0.44
0 to 0.060
Chromium (Cr), % 0
24 to 27
Iron (Fe), % 98.4 to 98.9
62.1 to 70.1
Manganese (Mn), % 0.7 to 1.0
0 to 1.0
Molybdenum (Mo), % 0
1.8 to 2.5
Nickel (Ni), % 0
4.0 to 6.0
Nitrogen (N), % 0
0.15 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0.080 to 0.13
0 to 0.040