AR Sponsor
Posted: 7/16/2015 2:11:26 AM EDT
| I have a new AR 15 chambered in 7.62x39. The barrel is a Chrome Molly parkerized barrel. I want to have the barrel melonited - Melonite QPQ. Can anyone give me recommendations on where to get this done and hopefully an email address to contact them? Any and all input would be greatly appreciated. Thank you. |
I'm not completely sure on this, but I have a feeling quench, polish, quenching an already park'd and possibly already chrome lined barrel isn't going to happen. 
Sorry to be a buzzkill. But being it's a steel surface hardening process, I assume it needs to be done before the barrel has been parkerized, and if your barrel is chrome lined, I'm not sure how hard chrome would react to being QPQ'd, but I have a feeling the results would be less than stellar. |
|
When the topic came up in Handguns the thread had 2 replies.
http://www.ar15.com/forums/t_5_4/160682_Suggestions_on_where_to_have_a_slide_barrel_melonited_.html ETA: locating a barrel would probably be cheaper and faster. Link and another Link |
| I had my pistols sent to WMD Guns, they did a good job. I called before I sent them to ask a couple of questions and after we talked a bit they told me that they could also melonite my AK74 so I didn't have to worry about rust. Everything I had read said the AK had to be stripped down to melonite the individual pieces but I was informed that they can field strip and do the process. IDK, I haven't sent them my 74 because I don't shoot it that much any more but they have a very good reputation so I have no reason to doubt them. I also sent some to Coal Creek but had a bad experience and now see that they are out of business. |
|
Quoted:
You want a barrel melonited prior to the extension being installed. The meloniting process is reported to cause issues with the extension/bbl when melonited together. Loosening seems to be the issue. A few months back I was reading about a stainless barrel group where the extension came loose after the melonite procedure. I believe the extension had to be re-torqued, the old gas hole welded in, and a new one drilled. |
| Melonite is a salt bath type nitriding. It is not recommended on barrels that have the extension already torqued. The salt can migrate into the thread area.You can have it gas nitrided . I have not had a single issue with that process. The problem is that it costs around $400 to run the oven, 1 barrel or 30. I use Nitrex. They have locations all over the US. If you are not in a hurry, they will include it in another batch when they are doing the same material. Temperature and time in the oven varies with type of material. The temperature is low enough that it does not affect the stress relieving of the barrel. Craig |
|
Quoted:
Melonite is a salt bath type nitriding. It is not recommended on barrels that have the extension already torqued. The salt can migrate into the thread area.You can have it gas nitrided . I have not had a single issue with that process. The problem is that it costs around $400 to run the oven, 1 barrel or 30. I use Nitrex. They have locations all over the US. If you are not in a hurry, they will include it in another batch when they are doing the same material. Temperature and time in the oven varies with type of material. The temperature is low enough that it does not affect the stress relieving of the barrel. Craig And no salt to clean out? |
| In gas nitriding , cyanide is most commonly used. There is no salt residue. My guess is that when the barrel is immersed into the molten salt, even though it is preheated first, the extension is thin wall and grows at a greater rate than the barrel. Even if only for a second, that allows the salt to get into the thread area. I have had rifles brought to me where the extension was loose, and there is a trace of the salt in the thread area. I do not think it always happens, but sometimes it does. The gas process, the temperature is ramped up more slowly and held there for a length of time. As long as 24 hrs sometimes. The cool down is more controlled as well. What makes melonite more appealing is that it is fairly inexpensive to get started. You do not have EPA involved because of deadly gases. You do not have to spend $150,000 plus for a sealed oven and gas recovery system. It lends itself to single item , small lot runs. It works great on almost everything else. Craig |
|
Quoted:
I'm not completely sure on this, but I have a feeling quench, polish, quenching an already park'd and possibly already chrome lined barrel isn't going to happen.
Sorry to be a buzzkill. But being it's a steel surface hardening process, I assume it needs to be done before the barrel has been parkerized, and if your barrel is chrome lined, I'm not sure how hard chrome would react to being QPQ'd, but I have a feeling the results would be less than stellar. This....this man knows what he is talking about. 
|
|
Quoted:
In gas nitriding , cyanide is most commonly used. There is no salt residue. My guess is that when the barrel is immersed into the molten salt, even though it is preheated first, the extension is thin wall and grows at a greater rate than the barrel. Even if only for a second, that allows the salt to get into the thread area. I have had rifles brought to me where the extension was loose, and there is a trace of the salt in the thread area. I do not think it always happens, but sometimes it does. The gas process, the temperature is ramped up more slowly and held there for a length of time. As long as 24 hrs sometimes. The cool down is more controlled as well. What makes melonite more appealing is that it is fairly inexpensive to get started. You do not have EPA involved because of deadly gases. You do not have to spend $150,000 plus for a sealed oven and gas recovery system. It lends itself to single item , small lot runs. It works great on almost everything else. Craig What happens with barrels coming back, even just bolt gun barrels, there's a layer of the salt still inside the bore that has to be righteously scrubbed out. I'm going to look into gas nitriding. Is there anyone in the US who does it? |
|
Quoted:
What happens with barrels coming back, even just bolt gun barrels, there's a layer of the salt still inside the bore that has to be righteously scrubbed out. I'm going to look into gas nitriding. Is there anyone in the US who does it? Quoted:
Quoted:
In gas nitriding , cyanide is most commonly used. There is no salt residue. My guess is that when the barrel is immersed into the molten salt, even though it is preheated first, the extension is thin wall and grows at a greater rate than the barrel. Even if only for a second, that allows the salt to get into the thread area. I have had rifles brought to me where the extension was loose, and there is a trace of the salt in the thread area. I do not think it always happens, but sometimes it does. The gas process, the temperature is ramped up more slowly and held there for a length of time. As long as 24 hrs sometimes. The cool down is more controlled as well. What makes melonite more appealing is that it is fairly inexpensive to get started. You do not have EPA involved because of deadly gases. You do not have to spend $150,000 plus for a sealed oven and gas recovery system. It lends itself to single item , small lot runs. It works great on almost everything else. Craig What happens with barrels coming back, even just bolt gun barrels, there's a layer of the salt still inside the bore that has to be righteously scrubbed out. I'm going to look into gas nitriding. Is there anyone in the US who does it? Take a look at these guys...they do - High Temperature Gas Nitriding - Ion Plasma / Ion Nitriding (DHIN) http://www.ibccoatings.com/surface-treatments |
|
Quoted:
Take a look at these guys...they do - High Temperature Gas Nitriding - Ion Plasma / Ion Nitriding (DHIN) http://www.ibccoatings.com/surface-treatments Quoted:
Quoted:
Quoted:
In gas nitriding , cyanide is most commonly used. There is no salt residue. My guess is that when the barrel is immersed into the molten salt, even though it is preheated first, the extension is thin wall and grows at a greater rate than the barrel. Even if only for a second, that allows the salt to get into the thread area. I have had rifles brought to me where the extension was loose, and there is a trace of the salt in the thread area. I do not think it always happens, but sometimes it does. The gas process, the temperature is ramped up more slowly and held there for a length of time. As long as 24 hrs sometimes. The cool down is more controlled as well. What makes melonite more appealing is that it is fairly inexpensive to get started. You do not have EPA involved because of deadly gases. You do not have to spend $150,000 plus for a sealed oven and gas recovery system. It lends itself to single item , small lot runs. It works great on almost everything else. Craig What happens with barrels coming back, even just bolt gun barrels, there's a layer of the salt still inside the bore that has to be righteously scrubbed out. I'm going to look into gas nitriding. Is there anyone in the US who does it? Take a look at these guys...they do - High Temperature Gas Nitriding - Ion Plasma / Ion Nitriding (DHIN) http://www.ibccoatings.com/surface-treatments Thanks. 
|
|
Quoted:
Thanks. Quoted:
Quoted:
Quoted:
Quoted:
In gas nitriding , cyanide is most commonly used. There is no salt residue. My guess is that when the barrel is immersed into the molten salt, even though it is preheated first, the extension is thin wall and grows at a greater rate than the barrel. Even if only for a second, that allows the salt to get into the thread area. I have had rifles brought to me where the extension was loose, and there is a trace of the salt in the thread area. I do not think it always happens, but sometimes it does. The gas process, the temperature is ramped up more slowly and held there for a length of time. As long as 24 hrs sometimes. The cool down is more controlled as well. What makes melonite more appealing is that it is fairly inexpensive to get started. You do not have EPA involved because of deadly gases. You do not have to spend $150,000 plus for a sealed oven and gas recovery system. It lends itself to single item , small lot runs. It works great on almost everything else. Craig What happens with barrels coming back, even just bolt gun barrels, there's a layer of the salt still inside the bore that has to be righteously scrubbed out. I'm going to look into gas nitriding. Is there anyone in the US who does it? Take a look at these guys...they do - High Temperature Gas Nitriding - Ion Plasma / Ion Nitriding (DHIN) http://www.ibccoatings.com/surface-treatments Thanks. My pleasure.
|
|
Quoted:
thank you for your reply. I appreciate it. I've been told that it can be done. I have serious concerns about it and that's why i need to contact someone who actually does it. Goog "black nitride". Several large places specializing in the various processes. |
AR Sponsor