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ACI-ASTM CA6NM Steel vs. SAE-AISI 4340M Steel

Both ACI-ASTM CA6NM steel and SAE-AISI 4340M steel are iron alloys. They have 86% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CA6NM steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
710
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
6.0
Fatigue Strength, MPa 380
690
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
72
Tensile Strength: Ultimate (UTS), MPa 850
2340
Tensile Strength: Yield (Proof), MPa 620
1240

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Mechanical, °C 770
430
Melting Completion (Liquidus), °C 1450
1440
Melting Onset (Solidus), °C 1400
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
38
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 3.2
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 10
3.9
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.5
1.9
Embodied Energy, MJ/kg 34
26
Embodied Water, L/kg 110
55

Common Calculations

PREN (Pitting Resistance) 15
2.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
120
Resilience: Unit (Modulus of Resilience), kJ/m3 1000
4120
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 30
84
Strength to Weight: Bending, points 26
51
Thermal Diffusivity, mm2/s 6.7
10
Thermal Shock Resistance, points 31
70

Alloy Composition

Carbon (C), % 0 to 0.060
0.38 to 0.43
Chromium (Cr), % 11.5 to 14
0.7 to 1.0
Iron (Fe), % 78.4 to 84.6
93.3 to 94.8
Manganese (Mn), % 0 to 1.0
0.65 to 0.9
Molybdenum (Mo), % 0.4 to 1.0
0.35 to 0.45
Nickel (Ni), % 3.5 to 4.5
1.7 to 2.0
Phosphorus (P), % 0 to 0.040
0 to 0.012
Silicon (Si), % 0 to 1.0
1.5 to 1.8
Sulfur (S), % 0 to 0.030
0 to 0.012
Vanadium (V), % 0
0.050 to 0.1