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SAE-AISI 4340M Steel vs. ACI-ASTM CN7MS Steel

Both SAE-AISI 4340M steel and ACI-ASTM CN7MS steel are iron alloys. They have 55% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (7, 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 CN7MS steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
160
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
39
Fatigue Strength, MPa 690
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
77
Tensile Strength: Ultimate (UTS), MPa 2340
540
Tensile Strength: Yield (Proof), MPa 1240
230

Thermal Properties

Latent Heat of Fusion, J/g 280
340
Maximum Temperature: Mechanical, °C 430
1040
Melting Completion (Liquidus), °C 1440
1400
Melting Onset (Solidus), °C 1400
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 38
12
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
28
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.9
5.1
Embodied Energy, MJ/kg 26
71
Embodied Water, L/kg 55
180

Common Calculations

PREN (Pitting Resistance) 2.2
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
170
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
19
Strength to Weight: Bending, points 51
19
Thermal Diffusivity, mm2/s 10
3.2
Thermal Shock Resistance, points 70
13

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.070
Chromium (Cr), % 0.7 to 1.0
18 to 20
Copper (Cu), % 0
1.5 to 2.0
Iron (Fe), % 93.3 to 94.8
45.4 to 53.5
Manganese (Mn), % 0.65 to 0.9
0 to 1.0
Molybdenum (Mo), % 0.35 to 0.45
2.5 to 3.0
Nickel (Ni), % 1.7 to 2.0
22 to 25
Phosphorus (P), % 0 to 0.012
0 to 0.040
Silicon (Si), % 1.5 to 1.8
2.5 to 3.5
Sulfur (S), % 0 to 0.012
0 to 0.030
Vanadium (V), % 0.050 to 0.1
0