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Centerfire Rifles - Manually Operated Lever action, bolt action or other non gas operated centerfire rifles.

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  #41  
Old 08-09-2018, 10:55 AM
Dogbite Dogbite is offline
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Last edited by Dogbite; 08-09-2018 at 11:58 AM..
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  #42  
Old 08-09-2018, 10:56 AM
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Basic explanation -

Gas nitriding - 900F to around 1250F - Case hardness depth dependent upon hours of saturation. Best for medium and high carbon steels .002" up to .024" penetration on 4140 though 4340 typical barrel materials. Figure 25+ hours for .024" case depth. Must be in an atmosphere that circulates the air well. Base material growth is around .0005".
55-57 HRC can be achieved easily.

Melonite - Liquid nitriding. Faster penetration, use to use Cyanide + other chemicals - Not legal in Most of the USA that I Know of. I don't know what they use now. For the boar of a rifle, a better process - Same saturation depth which is dependent upon saturation time.

Both processes are wonderful for medium grade carbon steels.

You can Nitride anything but that does not meant that it penetrates. Stainless barrels will only get a .001" to .002"(NO CASE DEPTH) of penetration if that. I could be wrong and I will get a lot of flak from this but until a used barrel is cut in half and I can see the results though a microscope, I will stand by what I just typed.

Both processes are a ***** to clean up & lap afterwards.
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  #43  
Old 08-09-2018, 3:17 PM
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ar15barrels ar15barrels is offline
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Quote:
Originally Posted by Dogbite View Post
Melonite - Liquid nitriding.
I don't know what they use now.
Cyanide free heat treating salts.
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Old 08-10-2018, 6:38 AM
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Cyanide free heat treating salts.
LOLOLOLOL
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