Materials / Steel

Steel AISI 4340

Steel AISI 4340 (quenched and tempered) strength, stiffness, density and thermal properties, with their source.

A bracket in Steel AISI 4340, brushed finish.

ProcessWrought
Mechanical
Yield strength1,035MPasourcetypical, transverse
Ultimate tensile strength1,140MPasourcetypical, transverse
Elongation at break18%sourcetypical, transverse
Young's modulus (stiffness)200GPasourceMIL-HDBK-5J design value (AISI 4340, quenched and tempered)
Density7,840kg/m³sourcetypical
Strength to weight132kN·m/kg
Stiffness to weight25.5MN·m/kg
Poisson's ratio0.32sourceMIL-HDBK-5J design value (AISI 4340, quenched and tempered)
Shear modulus75.7GPa
Bulk modulus185GPa
Speed of sound5,049m/s
Thermal
Thermal conductivity37.5W/m·Ksourcetypical
Thermal expansion11.3µm/m·Ksourcemean, -18 to 93 °C
100 mm part over a 50 °C swing56.5µm growth
Specific heat448J/kg·Ksourcetypical
Heats up and cools (diffusivity)10.7mm²/s
Thermal shock resistance11,678W/m
Values forCarpenter (Latrobe) Lescalloy 4340 VAC-ARC datasheet; mechanical row for 1100 °F temper; physical properties grade-level
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1k10k0.1110100Density (kg/m³)Young's modulus (GPa)Plastic PLAPlastic PETGPlastic ABSPlastic TPUPlastic NylonAluminumSteelIronTitaniumSteel AISI 1018Stainless 304Stainless 316Aluminum 6061-T6Aluminum 7075-T6Brass C360Copper C110GlassSteel AISI 1045Steel A992Stainless 303Stainless 17-4PHAluminum 2024-T351Aluminum 5052-H32Aluminum 7050-T7451Titanium Ti-6Al-4VBrass C260Nickel Inconel 718Magnesium AZ31B-H24Zinc Zamak 3Plastic ABS (bulk/injection)Plastic PolycarbonatePlastic POM/AcetalPlastic Nylon PA6Plastic Nylon PA66Plastic PEEKPlastic UHMWPEPlastic HDPEPlastic PolypropylenePlastic PMMAFDM ASAFDM PolycarbonateFDM PAHT-CFFDM HIPSSLA Resin Tough 2000SLS PA12 NylonDMLS AlSi10Mg AluminumDMLS Ti-6Al-4V ELI TitaniumDMLS 316L Stainless SteelDMLS 17-4PH Stainless SteelSteel AISI 4340
Stiffness against density
1k10k101001kDensity (kg/m³)Yield strength (MPa)Plastic PLAPlastic PETGPlastic ABSPlastic TPUPlastic NylonRubberAluminumSteelIronTitaniumSteel AISI 1018Stainless 304Stainless 316Aluminum 6061-T6Aluminum 7075-T6Brass C360Copper C110GlassSteel AISI 1045Steel A992Stainless 303Stainless 17-4PHAluminum 2024-T351Aluminum 5052-H32Aluminum 7050-T7451Titanium Ti-6Al-4VBrass C260Nickel Inconel 718Magnesium AZ31B-H24Zinc Zamak 3Plastic ABS (bulk/injection)Plastic PolycarbonatePlastic POM/AcetalPlastic Nylon PA6Plastic Nylon PA66Plastic PEEKPlastic PTFEPlastic UHMWPEPlastic HDPEPlastic PolypropylenePlastic PMMAFDM ASAFDM PolycarbonateFDM PAHT-CFFDM HIPSSLA Resin Tough 2000SLA Resin Elastic 50ASLS PA12 NylonDMLS AlSi10Mg AluminumDMLS Ti-6Al-4V ELI TitaniumDMLS 316L Stainless SteelDMLS 17-4PH Stainless SteelBrickSteel AISI 4340
Strength against density

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