E-4340 Aircraft Alloy Plates
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Description
APPLICATIONS — Intended for use in the manufacturing of highly stressed aircraft
parts requiring good hardenability as well as parts requiring high ultimate tensile
strength.
Formability — This material in thicknesses up to 3/4" shall withstand being bent
90º around a diameter equal to its nominal thickness, both perpendicular and
parallel to the direction of rolling.
Heat Treatment — To develop the highest strength (260,000 psi minimum
ultimate) with the best combination of mechanical properties in both transverse
and longitudinal directions, the following thermal treatment is recommended:
Normalize — 1650ºF ± 25º
Austenitize — 1500ºF ± 25º
Quench — Oil, 140ºF maximum
Temper — 400/500ºF for 260,000 psi strength level
725ºF minimum for lower strength levels
For lower strength levels, higher tempering temperatures may be used.
parts requiring good hardenability as well as parts requiring high ultimate tensile
strength.
Formability — This material in thicknesses up to 3/4" shall withstand being bent
90º around a diameter equal to its nominal thickness, both perpendicular and
parallel to the direction of rolling.
Heat Treatment — To develop the highest strength (260,000 psi minimum
ultimate) with the best combination of mechanical properties in both transverse
and longitudinal directions, the following thermal treatment is recommended:
Normalize — 1650ºF ± 25º
Austenitize — 1500ºF ± 25º
Quench — Oil, 140ºF maximum
Temper — 400/500ºF for 260,000 psi strength level
725ºF minimum for lower strength levels
For lower strength levels, higher tempering temperatures may be used.
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E-4340 Aircraft Alloy Plates
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