My 858 is dead!

Heres a pic of my nitroed 858 round count roughly 1500 , seems to be no damage on the lugs thank god..

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Travis Bickle said:
Why were people Nitro Carburizing them? Sounds pointless and expensive.

lol and apparently detrimental as well.

Glad it didn't end up worse for you man, no injury means a good day. Yeesh.
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Why?? because your rifle does not rust and its the toughest finish there is , same as a Glock slide .... Well worth the $200 if done properly not having to clean your rifle after shooting corrosive .. Not sure whats happen to the OPs rifle but I cant see any process changing the temper of a steel unless it involves a torch or a forge..
 
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I wonder if the damage in the OPs rifle could have been caused from over pressure like a ultra hot load , head space problem or barrel obstruction ? Check your barrel for a bulge or ring from a squib load .. .. Just thinking cause if this damage was from soft steel there would be warning signs before it just jammed all a sudden and quit ? did you notice any? It looks more like pressure damage to me than premature wear ..
 
I noticed it last week when I pulled it out to prep for the weekend. It definitely looked worse after Saturday. The barrel looks like new. No rings, bulges, nothing. I'm still on my first case of ammo. I chronied about 20 rds last year and they where where I expected them, hovering around 2,400fps.
I'm disappointed, but I'll buy another when I put together the scratch.
 
boss351cleveland said:
I dont know much about the NC process but i know it takes a hell of alot of heat to change the temper of carbon steel , like get it red glowing hot...
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And you, sir, would be wrong. Depending on the steel and the condition, tempering at as low as 400F can significantly lower the hardness. Colour doesn't even begin to show until 800+F.


Mark
 
mmattockx said:
And you, sir, would be wrong. Depending on the steel and the condition, tempering at as low as 400F can significantly lower the hardness. Colour doesn't even begin to show until 800+F.


Mark
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Im not a expert or anything but 400f ? select fire and machine guns have barrels and gas system that will withstand that kind of heat during operation ? Why would a receiver soften so easy under similar heat ? engines for example can reach those temps .
 
boss351cleveland said:
I had the Nitro Carb done by Raunch Tactical too , i think mine was on the first or second batch .. I fired a crate or so since the work was done .. I dont know much about the NC process but i know it takes a hell of alot of heat to change the temper of carbon steel , like get it red glowing hot... sure dont think they get the parts that hot in the NC process ? What are the chances the heat treating was bad to start ? Im going to give mine a inspection now and post pics ..
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it will only take a few hundred degrees to change the temper
 
boss351cleveland said:
Im not a expert or anything but 400f ? select fire and machine guns have barrels and gas system that will withstand that kind of heat during operation ? Why would a receiver soften so easy under similar heat ? engines for example can reach those temps .
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Not all steels and not all heat treatment conditions. Knives are often tempered at 400F-450F and can be ruined at those temps if done incorrectly. If (a big IF), the surface treatment did soften the receiver, then I would suspect that the receiver had some kind of surface hardening done to it, such as carburizing or case hardening. This is done to provide a hard wear surface while leaving the bulk of the material tough and ductile to reduce the chances of a brittle failure. It would be relatively easy to burn that out, especially on a thin section like the rails where the bolt lugs lock on the 858 receiver.

As for machine gun barrels, they are not relying on heat treatment for their strength, it is a property of the material used in them. They do often show colour under sustained firing, which is around 1000F if it can be seen in daylight.


Mark
 
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