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Thread: Is nitrocarburizing the wave of the future?

  1. #41
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    Being the new guy here, and having experienced this response myself, this time I get the opportunity to say, "Use the search button."
    Seriously though... a plethora of information already exists on the topic on this forum alone.

    I will say that both hard chrome lining and nitriding (in some form or another) have been used on high stress components for a long time - racing pistons as one example of something other than a barrel. Two main differences I have gathered from my research are: 1) Hard chrome is applied on top of a metal, while nitriding is a process that hardens the outer layer of the metal (similar to anodizing aluminum). 2) Nitriding is very hard and maintains a very smooth surface over time. Hard chrome is very hard and develops microscopic cracks over time. This is less desirable in some applications but beneficial in others, as the cracks allow space for oil to collect to maintain lubrication over longer periods of time. I might use nitriding over hard chrome on applications that do not require or allow liquid lubrication, but I would give the nod to hard chrome for things like the inside of a bolt carrier, where oil is needed for lubrication and is not continuously pumped as it is inside an engine.

    Quote Originally Posted by polymorpheous View Post
    Heat kills barrels.
    Agreed. Well, throat erosion kills barrels, and heat is the greatest contributor to throat erosion. This is why the jury is still out for me on whether I'm going with a Noveske chrome lined barrel on my current build, or having a Noveske stainless steel barrel nitrided. I have not been able to find any concrete evidence or reputable source that says nitriding has a higher heat resistance than hard chrome, or vise versa. (meaning, which one is most resistant to wear at the extreme temperatures present in the throat of the barrel under rapid fire)

    Quote Originally Posted by GrumpyM4 View Post
    Nitriding penetrates fairly deep and if a part is small enough, it will fully penetrate and over harden that piece. If that piece is a high impact piece and placed under stress, it will break.
    You should probably quantify that for people... I've read that while nitriding penetrates deeper than the thickness of a traditional hard chrome bore lining, it is by no means "deep." I agree with you that it is probably not wise to nitride parts that see high impact stress (I personally would not nitride any part of a BCG).

    Quote Originally Posted by Artiz View Post
    Does anyone have a list of the companies that actually make nitrided AR barrels?
    Smith & Wesson
    Last edited by Badger89; 04-01-13 at 06:19.

  2. #42
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    Quote Originally Posted by mkmckinley View Post
    The burr is often produce when the barrel is chambered after hand lapping.
    Hand lap it after it is chambered?

  3. #43
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    . .
    Last edited by Turnkey11; 04-01-13 at 09:17. Reason: double post

  4. #44
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    Quote Originally Posted by ABNAK View Post
    What process was he using to "strip", if you will, the bore of all firing residue? I think it would involve more than just Hoppes and a bore brush to get it to that level.

    There is a guy on HKPro who did it to his MR556 barrel. I can't remember exactly what he did to get all of the fouling from the lands and grooves. I'll have to see if I can find his thread.
    Sweets for the copper...

  5. #45
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    Quote Originally Posted by MK18Pilot View Post
    Nitriding is all or nothing process. How would it be possible to only nitride the exterior of the barrel?
    To do that would require vapor a vapor deposition process such as that used with titanium nitride finishes (the gold finish sometimes used on tooling). But as such, this is material added to the surface finish versus Meloniting that pulls carbon towards the surface for increasing hardness and durabiluty without increasing overall dimensions.

  6. #46
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    Quote Originally Posted by ABNAK View Post
    What process was he using to "strip", if you will, the bore of all firing residue? I think it would involve more than just Hoppes and a bore brush to get it to that level.

    There is a guy on HKPro who did it to his MR556 barrel. I can't remember exactly what he did to get all of the fouling from the lands and grooves. I'll have to see if I can find his thread.
    I cleaned it for a week starting with JP Bore Paste and then used lots of WipeOut-PatchOut until I could no longer get any copper out. When I got it back from being melonited I had to again hit it with JB. There was this weird brown residue in the bore. After cleaning that out it seemed to take about 200-250 rounds before it really shot super accurate. I shot a .61" MOA 5-shot group at 100yds with PMC Bronze 55gr FMJ about a month ago, barrel now has in excess of 3.5K rounds through it.
    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  7. #47
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    Quote Originally Posted by Robb Jensen View Post
    I cleaned it for a week starting with JP Bore Paste and then used lots of WipeOut-PatchOut until I could no longer get any copper out. When I got it back from being melonited I had to again hit it with JB. There was this weird brown residue in the bore. After cleaning that out it seemed to take about 200-250 rounds before it really shot super accurate. I shot a .61" MOA 5-shot group at 100yds with PMC Bronze 55gr FMJ about a month ago, barrel now has in excess of 3.5K rounds through it.
    Did you send the barrel out with or without the barrel extension attached?
    Quote Originally Posted by scottryan View Post
    Anybody that owns or sells pistol versions of assault rifles is a bottom feeder, irregardless of the ban status of certain ammunition.

    They are illigetimate weapons that have no real purpose other than to attract retards to the gun community.

  8. #48
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    Quote Originally Posted by N.Franklin View Post
    Sweets for the copper...
    Sweets sucks for copper. I used to use it and though I was removing copper!

    Then I got some BoreTech Cu2... and was like. I ran some through what I thought was my clean .308 bolt gun barrel and it was puking green patches.
    Last edited by markm; 04-23-13 at 10:24.
    "You people have too much time on your hands." - scottryan

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