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SAE-AISI 4340 Steel vs. ACI-ASTM CA6N Steel

Both SAE-AISI 4340 steel and ACI-ASTM CA6N steel are iron alloys. They have 84% of their average alloy composition in common. There are 29 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 4340 steel and the bottom bar is ACI-ASTM CA6N steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12 to 22
17
Fatigue Strength, MPa 330 to 740
640
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
1080
Tensile Strength: Yield (Proof), MPa 470 to 1150
1060

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 430
740
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 44
23
Thermal Expansion, µm/m-K 13
9.9

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
11
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.7
2.5
Embodied Energy, MJ/kg 22
35
Embodied Water, L/kg 53
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 170
180
Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 3490
2900
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 45
38
Strength to Weight: Bending, points 22 to 33
30
Thermal Diffusivity, mm2/s 12
6.1
Thermal Shock Resistance, points 20 to 38
40

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.060
Chromium (Cr), % 0.7 to 0.9
10.5 to 12.5
Iron (Fe), % 95.1 to 96.3
77.9 to 83.5
Manganese (Mn), % 0.6 to 0.8
0 to 0.5
Molybdenum (Mo), % 0.2 to 0.3
0
Nickel (Ni), % 1.7 to 2.0
6.0 to 8.0
Phosphorus (P), % 0 to 0.035
0 to 0.020
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.020