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

Technical Data Sheet

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.

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

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

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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.