Aircraft Alloy Steel AISI 4340 / E-4340
Technical Data Sheet
|Chemical Composition Limits|
|Weight%||C||Mn||P & S||Si||Cr||Ni||Mo|
|E4340 Bar||0.38 - 0.43||0.65 - 0.85||0.025||0.15-0.30||0.70-0.90||1.65-2.00||0.20-0.30|
Alloy E 4340 is a widely used deep-hardening constructional steel. Due to E-4340's high alloy content it obtains a uniformed hardness by heat treatment. The high fatigue strength makes E4340 ideal for highly stress parts as it maintains it's strength and hardness at elevated temperatures.
Typical Mechanical Properties
|Alloy||Condition||Tensile Strength ksi||Yield Strength ksi||Elongation 4D %||Reduction of Area %||Hardness HB|
|Alloy Steel E4340 Bar||Annealed||-||-||-||-||235 max|
|Alloy Steel E4340 Bar||Hardened and Tempered||260||217||10||30||-|
To obtain the highest strength (260,000 psi minimum ultimate)
|Normalised||1650°F / 1 hr|
|Austenitise||1500°F / 1 hr|
|Double Temper||475°F / 2 hr twice|
AMS 6359 Sheet / strip / plate
AMS 6409 Bars / Forgings N&T
AMS 6414 Vac Melt Bars / Forgings
AMS 6415 Bars / Forgings
AMS 6484 Bars / Forgings N&T
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Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.
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