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Aircraft Alloy Steel AISI 4340 / E-4340

Technical Data Sheet

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.

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
E4340 Plate	0.38-0.43	0.60-0.80	0.025	0.15-0.35	0.70-0.90	1.65-2.00	0.20-0.30

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	-

Heat Treatment
To obtain the highest strength (260,000 psi minimum ultimate)

E 4340
Normalised	1650°F / 1 hr
Austenitise	1500°F / 1 hr
Quench	Oil
Double Temper	475°F / 2 hr twice

Availability
Alloy E-4340 (4340) is available in Bar, Square, Round, Hexagon, Flat, Plates, Forging Stock and Welding Wire. For all stock availability contact Sales.

Specifications
UNS G43406
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
AMS-S-5000
MIL-S-8844 Cl1
ASTM A322
ASTM A331
AISI E4340
BMS-7-28
BPS-299-947-055
BPS-299-949-055

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Disclaimer
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.