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Aircraft Alloy Steel 300M / AISI E4340 Mod (AMS 6417 / AMS 6419)


Technical Data Sheet

 

Chemical Composition Limits
Weight% C Mn P & S Si Cr Ni Mo V Cu
300M VAR 0.38 - 0.45 0.60-0.90 0.010 1.45-1.80 0.70-0.95 1.65-2 0.30-0.50 0.05-0.10 0.35

Alloy Steel 300M VAR is similar to 4340  with the addition of vanadium and a higher silicon content. Alloy 300M offers a combination of toughness and ductility at high strength levels without an increased carbon content. Alloy 300M VAR is Vacuum arc-remelted for excellent purity. 300M can also be supplied dual certified to the British aerospace standard BS 5155.

Typical Mechanical Properties

 

Alloy Condition Tensile Strength ksi Yield Strength ksi Elongation % Reduction of Area % Hardness HB
Alloy AMS 6417 Bar Normalised/Tempered - - - - 311 max
Alloy AMS 6417 Bar Hardened/ Tempered & Heat Treated 270 220 8 30 -
Alloy AMS 6419 Bar Normalised/Tempered - - - - 311 Max
Alloy AMS 6419 Bar Normalised/Tempered & Heat Treated 280 230 7 25 -

Heat Treatment
AMS 6419 / AMS 6417 / AMS 6257

300M Var
Normalised 1700°F / 1 hr
Austenitise 1600°F / 1 hr
Quench Oil
Double Temper 575°F / 2 hr twice

Availability
Alloy 300M VAR (AISI E4340) is available in Round Bar, Tube and Welding Wire.  For all stock availability contact Sales.

Specifications
AISI E4340 Modified
AMS 6257 Bars / Forgings N&T
AMS 6417 Vac Melt Bars / tubes
AMS 6419 Bars / tubes
MIL-S-8844 Cl3
MIL-S-83135
BMS-7-26-Cl1
CE-0896
DMS-1935
GM-1012
LC-05-1190
BS S155
  
Services
At Aircraft Materials all stock items can be shipped out within 24 hours, usually within the same day. Even cutting orders for bar or sheet can be processed and dispatched the same day, and for time-critical situations such as AOGs, we have a dedicated AOG service desk ready to help (aog@aircraftmaterials.com).

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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.

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