Chromoly barrel vs Stainless barrel

[butchlambert]

liquid nitrogen goes down too about minus 500 I can remember the exact hours but its like down for twelve and bring it back up then down again over about 48 hours.

You may want to look at your nitrogen specs. Ain't gonna get that cold. Helium-3 gets much much colder temp for cryo.

 

[jelenko]

Yeah. Liquid nitrogen is -320 F/-198 C.

Absolute zero is -460 F/- 273 C.

Hmm. Here's an interesting article done by the Defense Systems Information Analysis Center on the impact of cyro treatment on gun barrels. Apparently, tests done by the NRA and Sierra did not show improvements in accuracy. In some of the samples tested, there was increased wear resistance, but not in all samples.
https://dsiac.org/technical-inquiries/notable/cryogenic-barrel-treatments/

 

[rijndael]

Cryo break your heart, did it?

Nope …. [Removed]

I’ll just add you to the ignore list. It’s best.

 

[butchlambert]

The military is doing research on stuff like ceramic coating of tank and artillery barrels to increase barrel life. You don't want to replace tank barrels in the field under combat conditions. They gave up on other processes like some are discussing on this website. Google might find some good articles. I don't think anyone on this website has a good understanding of what cryo treating does. Many of the coatings the military tested were too expensive or had bonding problems. I have some understanding of what cryo does to carbon steels but SS is completely different. In martensitic carbon steel cryo transforms the retained austenite phase to untempered martensite. Don't see how this makes a better barrel. I will look up technical stuff on cryo. Many good techy articles by the military on all the details of barrel erosion. Also read a very long article on the military research on barrel coatings, It's called hot gas erosion and it's related to the melting temperature of the metal and chemical reactions with the metal. Not really related to hardness.

For now as a varmint hunter I will just replace barrels when I feel like it. I doubt many serious competitive shooters worry about special barrel treatments. Some competitors buy many barrels at a time and toss them after about 1000 shoots.

Side issue, a lot of comp shooters are getting rid of bronze brushes and using just nylon. I proved to myself that bronze brushes scratch the barrel all lot. I brushed some barrel stubs with bronze, cross-sectioned them and examined the surface with a scanning electron microscope.

Some of us have done more than read about cryo on the inner neck. Who told you that we gotten rid of our bronze brushes?

 

[Naildriver_2007]

Cryo seems to be same discussion as 7.5s or 8s in trap shooting...........

Personally I’m going to go with the 8’s with 17.5 % more shot… I need all the extra luck (pellets) I can get to break that target.

 

[INTJ]

It looks like the best solution may be to cryo the barrel WHILE it is being heat treated. Best of both worlds......

 

[Dusty Stevens]

It looks like the best solution may be to cryo the barrel WHILE it is being heat treated. Best of both worlds......

Dont forget to shoot some abrasive bullets then melonite it right after