4140 / AMS 6349 / AMS 6382

Chemical Composition & Mechanical and Physical Properties

C%
0.38-0.43
Mn%
0.75-1.00
Si%
0.15-0.30
S%
0.025 max
P%
0.025 max
Cr%
0.80-1.10
Mo%
0.15-0.25
0.2 % Yield Strength Rp ksi
570-770
Tensile Strength Rm ksi
850-930
Elongation 4D %
14min
Hardness HB
250min

Application areas

In aviation, AISI 4140 alloy is used in shafts, pumps, gears, and conveyor components. It provides the necessary strength, durability, and wear resistance required for these applications.

Specifications

1.7225 42CrMo4, EN10083-1 708M40, 709M40 ASTM A322 AMS 6349, AMS 6382, AMS S 5626 MIL S 5626 AS 1444-1996
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