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Carbonitride and +.005 tap?

Mtndew

Diamond
Joined
Jun 7, 2012
Location
Michigan
We have some 8620 that gets Carbonitride and some threads.
56-58Rc
Is this similar to Carbeurize and hardening where a +.005 tap is needed?
Or can we just tap normal and send to heat treat?
 
Straight nitriding has essentially no dimensional change.

Don't know about carbo-nitriding. It's midway between nitriding and carburizing w.r.t. the temperatures involved and what it adds to the surface chemistry. A quick check finds some people saying no dimensional change, other people saying some dimensional change. I did find one paper that claims nitro-carburizing produces less dimensional change than carbo-nitriding, apparently there's some.

Consult your heat treater, and they will consult the tea leaves. Or, run a prototype sample and see how the actual part behaves.
 
Is it the same as "gas nitriding"? I remember years back making parts out of 4140 (I think) and having them gas nitrided(?), no dimensional changes that I remember...
 
I run a batch of parts that have a 7/16-20 3A thread. We have no issues with them when they come back from carbonitride.
 
Thanks guys, I'll have the boss call the heat treat company.
We've done Ion-Nitriding many times in the past, the part doesn't grow with that method and I am hoping it's the same for Carbonitriding.
 








 
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