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SAE-AISI 4340M Steel vs. ACI-ASTM CG6MMN Steel

Both SAE-AISI 4340M steel and ACI-ASTM CG6MMN steel are iron alloys. They have 61% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (9, 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 CG6MMN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
34
Fatigue Strength, MPa 690
260
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
79
Tensile Strength: Ultimate (UTS), MPa 2340
670
Tensile Strength: Yield (Proof), MPa 1240
320

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Mechanical, °C 430
1080
Melting Completion (Liquidus), °C 1440
1420
Melting Onset (Solidus), °C 1400
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Expansion, µm/m-K 13
17

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
22
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.9
4.8
Embodied Energy, MJ/kg 26
68
Embodied Water, L/kg 55
180

Common Calculations

PREN (Pitting Resistance) 2.2
34
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
190
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
260
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
24
Strength to Weight: Bending, points 51
22
Thermal Shock Resistance, points 70
14

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.060
Chromium (Cr), % 0.7 to 1.0
20.5 to 23.5
Iron (Fe), % 93.3 to 94.8
51.9 to 62.1
Manganese (Mn), % 0.65 to 0.9
4.0 to 6.0
Molybdenum (Mo), % 0.35 to 0.45
1.5 to 3.0
Nickel (Ni), % 1.7 to 2.0
11.5 to 13.5
Niobium (Nb), % 0
0.1 to 0.3
Nitrogen (N), % 0
0.2 to 0.4
Phosphorus (P), % 0 to 0.012
0 to 0.040
Silicon (Si), % 1.5 to 1.8
0 to 1.0
Sulfur (S), % 0 to 0.012
0 to 0.030
Vanadium (V), % 0.050 to 0.1
0.1 to 0.3