Author Topic: Stress relief  (Read 604 times)

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Offline Rustyinfla

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Stress relief
« on: December 16, 2008, 07:11:47 AM »


  I see CW made a reference to it in another post and I didn't want to hijack that so I'll just ask how many have done that? I have the lightweight .223 barrel and while I know it will never be as good as a bull barrel I would like to do something with it.

  There is a place not far from me that does cryogenic treatment on everything you can name. I can just walk in and hand it to them, no mailing or shipping so I've been thinking about it for some time.

  Just what are you having the treatment done to? The barrel or the frame?
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Offline quickdtoo

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Offline petemi

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Re: Stress relief
« Reply #2 on: December 16, 2008, 08:06:18 AM »
I guess it doesn't make any sense to spend hundreds of bucks on an 89 dollar barrel....especially with barely imperceptible improvement.

Again I say, my Handis shoot better than I can....why bother.

I never say "How'd that one get way over there."  I know how it got there, I pulled it.  I see it when the hammer drops.

A question:  Lets say we have a barrel flawed in some way.  Would it not do the same thing bullet after bullet?  In other words, if it kicked a round out to 8 o'clock, wouldn't it do the same to all of them, and couldn't you adjust sights accordingly.  I'm assuming a tight barrel.  Just a dumb question from an ignorant old man.

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Offline Rustyinfla

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Re: Stress relief
« Reply #3 on: December 16, 2008, 11:03:39 AM »


  I don't know Pete there are some reasons to have repeatable mistakes. I've  been messing around with a 10/22 by putting a bull barrel on it. Reading post after post over on rimfire central I see  there is a problem with first round fliers. Mine does it, and most all of them do unless you make some modifications. The fact that you know it does it and what to do to fix it is worth something.
   Same with a Handi if it has a tendency to always through the first shot to 8 'o clock and you know it does it all that's left to do is to figure out why.
     I have a friend of mine that is the range officer at a local public range. You wouldn't believe how many people have a wobble factor that barely allows them to stay on paper at 100 yards.
 
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Offline dpe.ahoy

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Re: Stress relief
« Reply #4 on: December 16, 2008, 01:44:24 PM »
Ya know, I thought this was going to be about going out and shooting several boxes of rounds. ;D  As for wobble, I can do it with the best of them, so please ask your friend not to rat me out. :D  DP
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Offline mechanic

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Re: Stress relief
« Reply #5 on: December 16, 2008, 02:39:28 PM »
I've been a knife maker for many years, and have experimented with cryogenic treatments.  On stainless and some exotic alloys, they may have significant benefits.  On common tool steels, not so much.  A rifle barrel is not an extremely high carbon steel, but is certainly hard enough for it's purpose.

To harden steel, it is heated, and quickly cooled.  This gives great hardness, but is not a desireable form of the steel.  To be useful, it must also be tempered.  This is what creates desireable metal for tool use, and I would guess, for gun barrel use.  A measure of manganese in the alloy would give it wearability.

If the metal were heated to non-magnetic state, (about 1500 degrees F.), then cryogenically cooled, it would be very hard, very brittle, and very STRESSED.

If the same mild steel were tempered in an ordinary fashion, in a tempering oven or such like, it would make a machinable, mallable workable steel with long life properties.

IMHO normal heat treating will suffice for the type of steel in a gun barrel. 

When steel is heated quickly, it will respond to the heat by expanding, then contorting.  The movement can be observed by laying a bar on a steel table, marking along side it, and applying heat with a torch.

Stainless steel is less subject to the movement, but has other factors that might affect it in a gun barrel.

Just thinking out loud......Most of what I know I learned making tools and knives, not guns so I'm probably way off base........

Ben
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