What’s up guys?!?!?!? It’s Michael with Michael Talks Metal back for another steel session today. Next up in our new series on aircraft quality alloy steels is a modified 4330 . Like any of the 43xx series alloys, Chromium, Nickel, and Molybdenum are key components and this modification adds Vanadium to increase its performance. With a nominal carbon content of point 30 %, it is capable of high strength and toughness. It can be heat treated to a hardness up to 40 Rc in sections 3 inches or less and higher hardness in thinner material.
It is available in all common product forms. Applications require CEM melting to develop strength and toughness in both the longitudinal and transverse directions in structural components.
Chemical Composition for 4330 V
|Chemical Composition||4330 V|
|Element||Min %||Max %|
|* .015 % max each for AMS 6411|
Small variations in these chemistry requirements exist in some specifications.
Typical End Quench Hardenability (EQH):
49 Rc @ 14/16″
45 Rc @ 24/16″
Typical Heat Treatment Temperatures:
Normalize – 1700 deg F
Austenitize – 1600 deg F
Temper – 500 deg F or 800 -1000 deg F minimum for toughness
We have only a handful of specs today so here goes. 4330 V aka 4330 mod.
|AMS 6411||Bars, Forgings, Tubing||2300||CEM||See Spec- Various|
|AMS 6427||Bars Forgings, Tubing||2301||VD||See Spec- Various|
|MIL-S-8699||Superceded by AMS 6411 & 6427|
As always, details in specifications and part requirements can alter what we have shown you here today. So this is time 98! Never forget to Check the Specs… Twice. Michlin Metals is a distributor of 4330V aka 4330 MOD, check the website for more info – www.michlinmetals.com – Thanks for watching. This is Michael with Michael Talks Metal.