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SAE-AISI 4340M Steel vs. ACI-ASTM CF3MN Steel

Both SAE-AISI 4340M steel and ACI-ASTM CF3MN steel are iron alloys. They have 70% of their average alloy composition in common. There are 31 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 4340M steel and the bottom bar is ACI-ASTM CF3MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
170
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
39
Fatigue Strength, MPa 690
250
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
78
Tensile Strength: Ultimate (UTS), MPa 2340
580
Tensile Strength: Yield (Proof), MPa 1240
290

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Mechanical, °C 430
1010
Melting Completion (Liquidus), °C 1440
1440
Melting Onset (Solidus), °C 1400
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 38
15
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
19
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.9
3.9
Embodied Energy, MJ/kg 26
53
Embodied Water, L/kg 55
160

Common Calculations

PREN (Pitting Resistance) 2.2
30
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
190
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
210
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
20
Strength to Weight: Bending, points 51
20
Thermal Diffusivity, mm2/s 10
4.1
Thermal Shock Resistance, points 70
13

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.030
Chromium (Cr), % 0.7 to 1.0
17 to 22
Iron (Fe), % 93.3 to 94.8
58.7 to 71.9
Manganese (Mn), % 0.65 to 0.9
0 to 1.5
Molybdenum (Mo), % 0.35 to 0.45
2.0 to 3.0
Nickel (Ni), % 1.7 to 2.0
9.0 to 13
Nitrogen (N), % 0
0.1 to 0.2
Phosphorus (P), % 0 to 0.012
0 to 0.040
Silicon (Si), % 1.5 to 1.8
0 to 1.5
Sulfur (S), % 0 to 0.012
0 to 0.040
Vanadium (V), % 0.050 to 0.1
0