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SAE-AISI 4340M Steel vs. 384.0 Aluminum

SAE-AISI 4340M steel belongs to the iron alloys classification, while 384.0 aluminum belongs to the aluminum alloys. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is SAE-AISI 4340M steel and the bottom bar is 384.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
85
Elastic (Young's, Tensile) Modulus, GPa 190
74
Elongation at Break, % 6.0
2.5
Fatigue Strength, MPa 690
140
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 72
28
Shear Strength, MPa 1360
200
Tensile Strength: Ultimate (UTS), MPa 2340
330
Tensile Strength: Yield (Proof), MPa 1240
170

Thermal Properties

Latent Heat of Fusion, J/g 280
550
Maximum Temperature: Mechanical, °C 430
170
Melting Completion (Liquidus), °C 1440
580
Melting Onset (Solidus), °C 1400
530
Specific Heat Capacity, J/kg-K 480
870
Thermal Conductivity, W/m-K 38
96
Thermal Expansion, µm/m-K 13
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
22
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
69

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
11
Density, g/cm3 7.8
2.9
Embodied Carbon, kg CO2/kg material 1.9
7.4
Embodied Energy, MJ/kg 26
140
Embodied Water, L/kg 55
1010

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
6.9
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
190
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
49
Strength to Weight: Axial, points 84
32
Strength to Weight: Bending, points 51
37
Thermal Diffusivity, mm2/s 10
39
Thermal Shock Resistance, points 70
15

Alloy Composition

Aluminum (Al), % 0
77.3 to 86.5
Carbon (C), % 0.38 to 0.43
0
Chromium (Cr), % 0.7 to 1.0
0
Copper (Cu), % 0
3.0 to 4.5
Iron (Fe), % 93.3 to 94.8
0 to 1.3
Magnesium (Mg), % 0
0 to 0.1
Manganese (Mn), % 0.65 to 0.9
0 to 0.5
Molybdenum (Mo), % 0.35 to 0.45
0
Nickel (Ni), % 1.7 to 2.0
0 to 0.5
Phosphorus (P), % 0 to 0.012
0
Silicon (Si), % 1.5 to 1.8
10.5 to 12
Sulfur (S), % 0 to 0.012
0
Tin (Sn), % 0
0 to 0.35
Vanadium (V), % 0.050 to 0.1
0
Zinc (Zn), % 0
0 to 3.0
Residuals, % 0
0 to 0.5