question regarding heat treating ak47 flats

DF- there is some very bad information there!
While you are heating hole #2 to red, you are already annealing hole #1, etc. etc.
4130 & 4140 won't harden enough to make a file skate.
I would just harden the whole receiver, then temper if necessary.
 
If you heat 4140/4130/4150 cherry red and throw it in water as previously mentioned, it will get like glass. If you spot heat it and throw it in quenching oil you will get spot hardening up to 58-60 RC. Do not use water. I have made a lot of high power rifle bolts and I sit behind my work. I find it hard to believe that they use Chrome Molly on receiver flats to begin with.
 
I know the nodakspud are heat treated. Lol the reason I asked the question was because I was interested in bending my own flats for my future builds. Not that I have a problem with nodakspud as there receivers are superb :) I just wanted to try my hand at bending :)
 
You need to keep in mind that what is done on a production basis requires repeatability and consistency in the final product, and often a strictly defined and required degree of hardening.


What can be accomplished with hand work for hardening (like 'spot hardening') is not going to be as consistent in the final outcome, but still may be adequate for the intended application.
 
Ok no problem
As posted by others I think a total heat treat with draw over pin holes
Only problem is to do that right needs holding fixture and a oven.

Your best bet would be to harden rails and spot treat pin holes with a torch and bucket of quenching oul
 
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