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Carburizing 4320

Carburizing 4320

Carburizing 4320

(OP)
Carburizing 4320 , going for .130" and achieved .060". should i anneal or just re-load and add. parts were normalized.

RE: Carburizing 4320

I think you need to confirm your furnace parameters before starting another load. Check your dewpoints, gas analysis, carbon potential, temperatures and times at temperature. Annealing may help with distortion but that is not the reason for your CD to be shallow by 0.070".

RE: Carburizing 4320

It really depends on factors you haven't mentioned.

If your furnace heats rapidly enough to cause cracking on reheating, then an anneal could help prevent cracking of the existing case.

As far as affecting the carburizing, it isn't going to matter; once the material reaches carburizing temperature, it won't matter if the material had been annealed or not.

In my experience, an existing case on carburized parts slows further carburization. With 4320 in particular, the likelihood of retained austenite is greater when re-carburizing, so you should be careful on your carbon potential or take other actions to address retained austenite.

rp

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