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||-|
AMS 6419 / AMS 6417 / AMS 6257
|Normalised||1700°F / 1 hr|
|Austenitise||1600°F / 1 hr|
|Double Temper||575°F / 2 hr twice|
AISI E4340 Modified
AMS 6257 Bars / Forgings N&T
AMS 6417 Vac Melt Bars / tubes
AMS 6419 Bars / tubes
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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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