CZ leaves barrel stock to rust?

In the beginning one of the workers gets a fork truck and picks up a big bundle of barrel stock -- left out side in the snow and completely rusted!

Wonder if this is done intentionally also?
Click to expand...

It costs lots of money to build indoor storage, so yes, it's left outdoors "intentionally".

I still have seen no scientific evidence it has an effect on the qualities of the metal
 
Awfully strange idea, I'm having a hard time buying into it. Forging and drilling would do a lot of things to that steel to counteract whatever the rust seasoning would do. It's beyond my understanding how it would contribute to making a better barrel.

Cryo work is different. taking certain types of steel through the heat treat process, letting it rest, and then cryo treating it with liquid nitrogen does, in fact, alter the grain structure of the steel, and in fact, can make the steel of cutting implements better. I see no reason why it would not work with barrels, as breaking up the grain of the steel can make very, very small faults in the steel simply vanish.

That's my take on cryo, from what I have read.

Steel rod, freshly rolled, may benefit from aging, rusting, etc. dunno.
 
What follows is just my guess...

Since CZ makes their stock in house, they know how their barrel steel is made. Since I don't know how they make their stock, I am assuming it is a standard hot rolled steel. Hot rolled steel will have "mill scale" on it from the manufacturing process. I'm guessing that since they are using the cold hammer forged barrel making process that they are using the surface rust to intentionally remove that scale left during the manufacturing process.

By letting the barrels age until they have a uniform coating of rust, CZ is assured that all the scale is gone, and they don't have to waste time, energy, and money by blasting, pickling, or machining away the scale. Much like not paying for indoor storage, letting mother nature do the work is a good way to save money.

As far as surface rust hardening the core, I think what is meant that as the surface scale goes away, the blank becomes more uniform, allowing the cold hammer forging process to create a more uniform barrel hardness. I would hazard to guess that having material break off during the CHF process would not be good for the final barrel. If there were any surface tensions on the steel, surface rusting could relieve those, but I have a hard time seeing how that would harden the core.

That is just my best guess.

Jimro
 
They would turn the barrel before forging, anyway, a barrel would have to be bored, honed, polished, trued, before forging on the mandrel, or you would wind up with distortions and bad spots in the steel, I expect. After that they still heat treat it to relieve stress and stabilize it, and I have heard that another turn on the lathe can even taper the bore by relieving pressure. That is to be taken with a grain of salt. I'm not sure where I read it, but I believe that it was Jim Carmichael.
 
Sad to say but much of cryo is BS. Cryo does NOT affect grain size . Benelli had a photo on their website that was nonsense but I guess most people believed it . Dealing with tool steel or steels to be hardened like some knife steels cryo can improve wear resistance but it has to be part of the process not an add-on. NRA and various barrel makers tested cryo and couldn't find improvement with cryo.
Cold forged rifle barrels require very precise conditions in every part of the process .I don't think rusting it is part of that precise conditions !

But then huge numbers of people believe in the biggest hoax of all --Global Warming !! Even after all those emails were published admitting fraud ! :rolleyes:
 
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