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SAE-AISI 4140 Steel vs. Class 4 Tungsten

SAE-AISI 4140 steel belongs to the iron alloys classification, while class 4 tungsten belongs to the otherwise unclassified metals. There are 24 material properties with values for both materials. Properties with values for just one material (8, 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 4140 steel and the bottom bar is class 4 tungsten.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
270
Elongation at Break, % 11 to 26
2.3
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
110
Tensile Strength: Ultimate (UTS), MPa 690 to 1080
790
Tensile Strength: Yield (Proof), MPa 590 to 990
580

Thermal Properties

Latent Heat of Fusion, J/g 250
170
Specific Heat Capacity, J/kg-K 470
130
Thermal Conductivity, W/m-K 43
30
Thermal Expansion, µm/m-K 13
4.5

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
17
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
9.7

Otherwise Unclassified Properties

Density, g/cm3 7.8
16
Embodied Carbon, kg CO2/kg material 1.5
24
Embodied Energy, MJ/kg 20
360
Embodied Water, L/kg 51
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 74 to 180
16
Resilience: Unit (Modulus of Resilience), kJ/m3 920 to 2590
620
Stiffness to Weight: Axial, points 13
9.6
Stiffness to Weight: Bending, points 24
14
Strength to Weight: Axial, points 25 to 38
14
Strength to Weight: Bending, points 22 to 30
12
Thermal Diffusivity, mm2/s 12
15
Thermal Shock Resistance, points 20 to 32
46

Alloy Composition

Carbon (C), % 0.38 to 0.43
0
Chromium (Cr), % 0.8 to 1.1
0
Iron (Fe), % 96.8 to 97.8
0
Manganese (Mn), % 0.75 to 1.0
0
Molybdenum (Mo), % 0.15 to 0.25
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0
Sulfur (S), % 0 to 0.040
0
Tungsten (W), % 0
97
Residuals, % 0
3.0