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4140 4330 Mod4340 / E-43404620 Vac. / AMS 62946150 Vac. / AMS 6448AISI 9310300mMARAGING 350MARAGING 300MARAGING 250

4340 / E-4340

Standards

Mat. No.
-
EU
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AISI
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UNS
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Diğer
Aircraft Alloy

Alloy E 4340 is a deep-hardening structural steel. It achieves uniform hardening through heat treatment due to its high alloy content. It is ideal for high-stress parts due to its high fatigue strength.

Chemical Composition & Mechanical and Physical Properties

C%
0.38-0.43
Mn%
0.65-0.85
Si%
0.15-0.35
P+S%
0.025 max
P%
0.025 max
Cr%
0.70-0.90
Mo%
0.20-0.30
Ni%
1.65-2.00
0.2 % Yield Strength Rp ksi
217
Tensile Strength Rm ksi
260
Elongation 4D %
10
Hardness HB
-

Application areas

In heavy industry, Alloy E 4340 is used in transmission components, gears, shafts, as well as in the defense industry for aviation, landing gear, and rocket motor casings.

Specifications

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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