Effects of machining Q&T material...
Effects of machining Q&T material...
(OP)
Will subsequent machining to already Q&T material effect the temper of the material? I have been asked this question and materials is not my specialty so I figured someone here must know the answer. I am told the material is 300 series stainless, but I didn't think 300 series is typically tempered? This is bar stock not sheet...
If it's an alloy or carbon grade that is Q&T will follow up machining step effect the tempering?
Thanks
If it's an alloy or carbon grade that is Q&T will follow up machining step effect the tempering?
Thanks





RE: Effects of machining Q&T material...
RE: Effects of machining Q&T material...
Machining of annealed 300 series stainless is a pain in the kiester. it work hardens rapidly, is stringy, and galls to the tool easily.
Use a high sulfur cutting oil, and the proper speeds and feeds. (lower speed, high feed)
RE: Effects of machining Q&T material...
You mention it would not be Q&T normally, So would it be safe to say that the 300 series stainless is not Q&T.
But in any case what would ruin the temper? Would it be high heat? Or would it also be ruined by excess material removal?
Thanks
RE: Effects of machining Q&T material...
If the steel is work hardened to some strength level then applying high enough temperatures will reduce the strength.
Nick
I love materials science!