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SAE-AISI 4340M Steel vs. SAE-AISI S6 Steel

Both SAE-AISI 4340M steel and SAE-AISI S6 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340M steel and the bottom bar is SAE-AISI S6 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
72
Tensile Strength: Ultimate (UTS), MPa 2340
670 to 1920

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Melting Completion (Liquidus), °C 1440
1430
Melting Onset (Solidus), °C 1400
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 38
41
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
3.2
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.9
2.3
Embodied Energy, MJ/kg 26
33
Embodied Water, L/kg 55
56

Common Calculations

PREN (Pitting Resistance) 2.2
2.7
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
24 to 70
Strength to Weight: Bending, points 51
22 to 45
Thermal Diffusivity, mm2/s 10
11
Thermal Shock Resistance, points 70
22 to 64

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.4 to 0.5
Chromium (Cr), % 0.7 to 1.0
1.2 to 1.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 93.3 to 94.8
92.8 to 94.7
Manganese (Mn), % 0.65 to 0.9
1.2 to 1.5
Molybdenum (Mo), % 0.35 to 0.45
0.3 to 0.5
Nickel (Ni), % 1.7 to 2.0
0
Phosphorus (P), % 0 to 0.012
0 to 0.030
Silicon (Si), % 1.5 to 1.8
2.0 to 2.5
Sulfur (S), % 0 to 0.012
0 to 0.030
Vanadium (V), % 0.050 to 0.1
0.2 to 0.4