Can you HT 4140 without controling the atmosphere?

A

A Zone

Joined
Jul 1, 2003
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I need to HT a finished part and wonder what would happen if I just popped it in my oven at 1550 F, held for 20 min. and quenched it in peanut oil? would the part be usable or would it have a lot of scale/pitting?
Thanks
 
It will have scale but could be sanded off. Is your piece at finished size already or do you have room to sand off a few thousands?
 
Finished size. It's a custom nut w/ flange. The thread is non standared and has been cut on a cnc mill. We don't have any way to clean up the thread after ht except to maybe remove some light scale with a round wire brush chucked up in a lathe. Of course the part has to be ready by yesterday so we can't order a tap in time. How should I ht this part(I have some Turco, but no foil)?
 
Ive never used turco but I like PBC from Brownnells. It is an anti-scale compound. Why do you need it hardened?
 
The customer specified that the part be made of 4140 treated as hard as possible. Last night I treated the nuts(4) with Truco on all surfaces except the threads. It was the only thing I could think of. They came out ok but needed a lot of wire brushing. The threads felt snug on the bolts after a wire brush clean up.

I may have to do this again in the future and I wonder how is this situation is best handled.

Thankes for the help,
zone
 
Brownell's PBC comes off in boiling water. You may have to wire brush the part alittle.

RL
 
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