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ACI-ASTM CN3MN Steel vs. SAE-AISI 4340 Steel

Both ACI-ASTM CN3MN steel and SAE-AISI 4340 steel are iron alloys. They have 50% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CN3MN steel and the bottom bar is SAE-AISI 4340 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
210 to 360
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 39
12 to 22
Fatigue Strength, MPa 250
330 to 740
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 80
73
Tensile Strength: Ultimate (UTS), MPa 620
690 to 1280
Tensile Strength: Yield (Proof), MPa 300
470 to 1150

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Maximum Temperature: Mechanical, °C 1100
430
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 460
470
Thermal Conductivity, W/m-K 13
44
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 33
3.5
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 6.2
1.7
Embodied Energy, MJ/kg 84
22
Embodied Water, L/kg 200
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
79 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 210
590 to 3490
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21
24 to 45
Strength to Weight: Bending, points 20
22 to 33
Thermal Diffusivity, mm2/s 3.4
12
Thermal Shock Resistance, points 14
20 to 38

Alloy Composition

Carbon (C), % 0 to 0.030
0.38 to 0.43
Chromium (Cr), % 20 to 22
0.7 to 0.9
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 41.4 to 50.3
95.1 to 96.3
Manganese (Mn), % 0 to 2.0
0.6 to 0.8
Molybdenum (Mo), % 6.0 to 7.0
0.2 to 0.3
Nickel (Ni), % 23.5 to 25.5
1.7 to 2.0
Nitrogen (N), % 0.18 to 0.26
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.010
0 to 0.040