For what it is worth. A good read, IMHO.
https://dsiac.org/technical-inquiri...esidual stresses created during manufacturing.
https://dsiac.org/technical-inquiri...esidual stresses created during manufacturing.
Cryogenic treatments of rifle barrels
- Thread starter FEENIX
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MagnumManiac
Well-Known Member
Had a Kreiger barrel that had the Cryo treatment, couldn't tell a difference, but that was ONE barrel.
Never thought about it since.
Cheers.
Never thought about it since.
Cheers.
Another interesting read. Thanks again Ed. I went the opposite direction on my last barrel. I had it nitride treated along with the action and bolt. Again very interesting.
Critter Picker
Well-Known Member
Never had one done,but I remember when the process was first introduced. I can't personally testify that it helps,but we all know that any type of stress relief performed has the potential to increase accuracy and reduce the effects of barrel heat changing POI .
Nitriding is another interesting process. Thanks!
My jp barrel for my ar10 is cryo treated but I've not seen any noticeable differences from my buddies Odin works barrel that is not . I did add the jp aluminum heat sink to my barrel to help with heat dispersion .
yobuck
Well-Known Member
Mind over matter.
If you dont mind it dont matter.
If you dont mind it dont matter.
Justice1327
Well-Known Member
How did that work out for you? Who did the work?
Omega Arms in Gillette sent the parts out with a batch that he had getting nitride treated. The action is very smooth being that hard, and the stainless barrel came back black. My understanding is that I can get about twice the life of an untreated barrel. Since it's a.308, I might not live long enough to shoot this barrel out. Time will tell.
Justice1327
Well-Known Member
I am getting ready to send off 3 barrels.
25-06AI, 6-6.5PRC, and 7-300 PRC
I will send off for Cryo first, then fluting, then nitriding.
Although on one I might nitride then flute so it has a extra kewl factor with the shiny spiral flutes.
No experience, I just like to test and play around. Hopefully it doesnt degrade the accuracy I currently have in them.
25-06AI, 6-6.5PRC, and 7-300 PRC
I will send off for Cryo first, then fluting, then nitriding.
Although on one I might nitride then flute so it has a extra kewl factor with the shiny spiral flutes.
No experience, I just like to test and play around. Hopefully it doesnt degrade the accuracy I currently have in them.
Fluting will introduce stress in the barrel . Anytime you cut into material you introduce stress in the material. Probably not enough to notice but it will be counter productive to the cryo treatment wich is supposed to relief stress. Nitride will look cool 
.
.
quigley257
Well-Known Member
The other factor to take into consideration is the iron content of the stainless steel. There are a number of types of stainless that have enough iron in them that they will still show rust if exposed to moisture or salt(near the coast). This can be eliminated through passivation but that is another step. Passivation explained here... https://www.theruststore.com/blogs/...i41WEcfzXAuSc0KMWdM72Njhv2LAId_EaAqQkEALw_wcB
MagnumManiac
Well-Known Member
Interested in the nitriding of barrels. I build race engines and many of our parts, especially forged steel cranks are nitrided prior to assembly.
Does this increase the longevity of the barrel? I know it hardens the steel, but what about Stainless?
I know in many crank configurations the nitriding changes the harmonics of the crankshaft by increasing the frequency and the harmonics occur higher in the RPM. 454 Big block Chevs are notorious for harmonics snapping crank ends at 6,500-6,800rpm, nitriding increases this to above 7,500rpm successfully.
Cheers.
Does this increase the longevity of the barrel? I know it hardens the steel, but what about Stainless?
I know in many crank configurations the nitriding changes the harmonics of the crankshaft by increasing the frequency and the harmonics occur higher in the RPM. 454 Big block Chevs are notorious for harmonics snapping crank ends at 6,500-6,800rpm, nitriding increases this to above 7,500rpm successfully.
Cheers.
dfanonymous
Well-Known Member
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Cryo treatment is for stress relief. This is more so effecting the machining process from what I seemed to understand, and has the benefit of making the grains or microstructure more uniform.
Nitriding is just a surface treatment that helps with wear. These are two different things that are not interchangeable.
If anyone is interested, nitriding is its own thread topic by itself. There's different processes, and honestly, I shoot in pro circles, and I'm not aware of anyone notable putting nitride and precision shooting together.
I would do research on each process and ask the person who's doing it how they do it before committing to buying.
In any case, despite the advertised wear resistance, what nitriding does NOT help with is micro cracking in the throat.
Nitriding is just a surface treatment that helps with wear. These are two different things that are not interchangeable.
If anyone is interested, nitriding is its own thread topic by itself. There's different processes, and honestly, I shoot in pro circles, and I'm not aware of anyone notable putting nitride and precision shooting together.
I would do research on each process and ask the person who's doing it how they do it before committing to buying.
In any case, despite the advertised wear resistance, what nitriding does NOT help with is micro cracking in the throat.
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