4340

Applications 

Rocket motor cases, ordnance hardware, aircraft structural components, transmission gears, components, fasteners.

Composition nominal wt. % 

C 0.41, Cr 0.8, Mn 0.7, Mo 0.25, Ni 1.9, P O.018, S 0.02, Si 0.23

Specifications 

AMS 6414, 6359, 6409, 6415, 6454; BMS 7-28.
ASTM A 29, A 320, A 322, A 331; MIL-S-5000.

Density lb/in3 (gcm3) 

0.283 (7.83)

Metallurgical Condition 

1,650°F Q + T

Tensile Strength ksi (MPa) 

250 (1,724)

0.2% Yield Strength ksi (MPa) 

220 (1,517)

Elongation % 

8

Reduction in Area % 

18

Hardness 

45 HRC

Fides (China) Investment & Trading Co., Ltd
Contact Us for More Informations