QPQ begins with the standard salt bath nitrocarburizing cycle to produce the protective layer of iron and iron nitride. 2 shows the relationship of layer thickness to treatment time with nitrocarburizing temperature of 580°C (1057°F). The higher the alloy content, the thinner the layer for the same treatment cycle. Without lubrication the nitrocarburized QP had the lowest coefficient of friction, being less than half of that of the hard chrome or case hardened surfaces. Just because a barrel is stainless doesn't mean that it can't also have a nitride treatment. Fig. 4 is the distance to the point where the hardness of the nitride layer is equal to the core hardness. The nitrogen-rich inter-metallic compound layer mainly contains iron-carbonitrides and, depending on the type and proportion of alloying elements in the base material, special nitrides. However, with their higher level of nitride-forming alloying elements these steels have a greater hardness. Just a comment on Melonite/Tenifer etc pistol slides and visible wear - the nitrocarburizing itself is not black, just bright steel color. Lubrication has only a slight influence on the coefficient of friction because the oxide layer of the outer surface was removed during the polishing operation. Ferritic nitrocarburizing or FNC, also known by the proprietary names Tenifer, Tufftride and Melonite as well as ARCOR, is a range of proprietary case hardening processes that diffuse nitrogen and carbon into ferrous metals at sub-critical temperatures during a salt bath. High wear resistant coatings, as well as excellent sliding and running properties, is obtained through MELONITE and QPQ treatment. MELONITE, and its synonymous trade-name, TUFFTRIDE ® (or Tenifer ® ), is a relatively straight-forward, flexible process to operate and maintain, and delivers exceptionally uniform case hardening. MELONITE is a thermochemical treatment for improving surface properties of metal parts. Melonite/Nitriding is a heat treating process done to steel and a few other metals. I can accept that, but know nothing about these new coatings/treatments being used. Other methods of ferric nitrocarburizing include gaseous process such as Nitrotec and ion (plasma) ones. Melonite is a form of nitriding so it's really asking phosphate vs. nitrided. Only downside to nitride barrels are they do not break in over time, once you do you initial break in, the grouping you get is … The MELONITE® Nitrocarburizing Process. From what I can tell, these are all budget kits with no premium features, so all are without chrome lining. Melonite™ and Melonite QPQ™ are thermochemical processes intended for the case hardening of iron based metals. When applying, the material is first coated … During the MELONITE process, which takes place between 900°F and 1075°F, the metal surface is enriched with nitrogen and carbon. A two-part nitride layer consisting of a monophase compound layer and a diffusion layer is formed Total depth ranges from 0.008-0.040″, depending on the composition of the base material and treating time. During nitrocarburizing, a two-part surface layer is formed, initially an outer compound layer, followed by a diffusion layer below it. During these processes, nitrogen, carbon, and small amounts of oxygen are diffused into the surface of the steel, creating an epsilon iron nitride layer (e – FexN). 8 shows the scuffing loads of gears made from various materials (6). Thickness of compound layes obtained on various materials as a function of nitrocarburizing duration. Picture: JP Enterprises .750 Adjustable Gas Block in QPQ Black Finish. Influence of chromium on diffusion layer hardness and total nitration depth in various 0.40-0.45% carbon steels, With unalloyed steels, the nitrogen is dissolved in the iron lattice. Melonite Nitride vs Chrome Lined. Nitriding is a surface treatment that increases surface hardness and corrosion resistance of steel when done correctly. 321-251-6050 Search. Total: 1,367 (members: 296, guests: 1,071), https://en.wikipedia.org/wiki/Ferritic_nitrocarburizing, https://en.wikipedia.org/wiki/Titanium_nitride. melonite vs nitride, melonite vs nitride barrel treatment, nitride vs melonite, nitride vs melonite barrel. 7 shows the coefficient of friction both under dry conditions and after lubrication with SAE 30 oil, measured by an Amsler machine. A porous area develops in the outer zone of the compound layer. Even SAE 5116, which had already been carburized, more than doubled the scuffing load it could withstand through the compound layer built by the nitrocarburizing treatment. Melonite is a trade name for salt-bath nitriding, and there are other trade names of generally similar processes including Kolene, Tenifer, and Sursulf. •Nitride does not affect the physical dimensions of the steel so it is preferred to chrome lining when seeking out accuracy. Corrosion resistance of unalloyed and low alloyed steels is greatly improved. The thickness for most applications is around 0.0004-0.0008″. Low alloy steels give thicker layers with lower hardness. See our review here: Toolcraft Chrome Phosphate BCG Review. Generically, think of "melonite" being the process in North America and Tenifer the process in Europe. Switch to Threaded Mode Mine also specifically said Melonite, instead of Nitride though I know they are just different names. Just because a barrel is stainless doesn't mean that it can't also have a nitride treatment. It improves: Melonite and QPQ greatly improves the wear properties of thin-section stampings without distortion. It is 3-4 times lower than that achieved with the chrome or martensitic surfaces. Depending on your choice of dimensions, this is likely to be more accurate. Zone 1, called the compound or “white” layer, extends to a case depth of ~0.0004″ to 0.0008″. 4. What Happens to Trump Between Now and Inauguration Day? The performance with SAE 5134 was about tripled. Zone 2, called the diffusion zone, extends to a case depth of ~.004″ to 0.008″. Email this Page. In metallographic analysis the compound layer is clearly definable fron the diffusion layer as a lightly etched layer. If I had my druthers I'd take chrome lined over nitride/Melonite/QPQ. Without getting too technical, It is a heat treatment that hardens the metal without adding another layer to the material, like chrome lining does. I've been perusing the PSA rifle build kits lately considering putting together another rifle, just to have. What barrel treatment is better then another? (See Fig. Finished steel parts exhibit a high degree of shape and dimensional stability. Melonite vs Nitride. Switch to Hybrid Mode. Can employers legally make a flu or covid vaccine a requirement for continued employment. Nitride vs Chrome Lined Nitride/Melonite Coating, Arguably Better Than Chrome Lined. Black Nitriding is a chemical process (in a salt bath) that infuses carbon and nitrogen into the metal, and the black color being a … It is the finish we use on all our black slides and its durability is unparalleled by any black finish we have used. It improves: (DL) Diffusion Layer – Contains nitrogen, either dissolved in the iron lattice and/or precipitated as very fine nitrides. Click on a term to search for related topics. Created with Sketch. Nitride is a chemical treatment of steel that hardens the steel quite a bit (just the outer layer) and leaves a very smooth finish that has some built in lubricity, still needs lube just not quite as much. Black Nickel. Hardness in the compound layer ranges from approximately HV 700 on alloyed steels to about HV 1600 on high chromium steels. I know melonite is just a brand name for a particular salt bath nitride process/ product, and it works by chemically changing the makeup of the surface, as opposed to micro slick, which is … Nitride is significantly less expensive and less time-consuming for making barrels. Melonite and nitride are the same thing and better than phosphate. These processes are categorized as molten salt bath ferritic nitrocarburizing. This one wasn't a Freedom series, so I think there is a difference. Armornite® finish is a hardened nitride finish that provides enhanced corrosion resistance, greatly improved wear resis-tance, decreased surface roughness, reduced light reflection and increased surface lubricity. I'm sure this has been asked before. Melonite and nitride are the same thing and better than phosphate. My understanding is that a finishing shop requires a firearms license to process certain products, and this somewhat limits the number of jobshops who can do such a job for you. The diffusion zone demonstrates a decreasing gradient concentration of carbon and particularly nitrogen as the gradient extends deeper into the surface of the substrate. It may not display this or other websites correctly. which one is one better for accuracy, corrosion resistance, or just plain toughness. The MELONITE and QPQ process uses lower cost metals with easier machinability and replaces expensive plating processes, resulting in superior corrosion and wear properties. Black Nitride. The nitrogen penetration into the diffusion layer provides for improved fatigue strength. As stated above, chrome lining is a known quantity. Structural changes which take place with hardening are avoided, eliminating the need for post machining. SNC = salt bath nitrocarburized. Phosphate is just fine, requires plenty of lube, but will last a long time. Black Nitride is more than just a baked on coating such as Cerakote (I have nothing against Cerakote, as I have 2 rifles with it). Melonite is also called Tenifer by Glock. The resulting surface is extremely hard which makes it … Please share your stories and who is … It has been determined that, unlike with chrome surfaces, the coefficient of friction of nitrocarburized QP and QPQ treated surfaces remains constant, even at varying sliding speeds. If cooling is done quickly, the nitrogen remains in super-saturated solution. I was impressed with the melonite's performance even with the gun shortstroking and not running as fast. In addition, small quantities of substrate carbon are pulled from deeper within the substrate toward the surface. (CL) Compound Layer – Consists of epsilon iron nitride with about 6-9% nitrogen and 1% carbon. Fig. Depending on the initial structure and composition of the core material, the nitrogen in the diffusion layer is dissolved in the iron lattice and/or precipitated as very fine nitrides. Total nitrocarburizing depth shown in Fig. 11C2P '83-'87 Airborne Infantry. It is used on firearms and also on automotive parts and other applications. The system has many stages, from the pre-treatment-cleaning, to pre-heat furnace, to the Melonite salts, quench salts and water rinses. Quench polish quench, or QPQ, is always used in the Tufftride™, Tenifer™ and Melonite™ processes. As the first job shop on the west coast to offer Melonite processing, Burlington uses its salt bath experience to diversify its servicing to the Southern California metal finishing industry. Scuffing load limit of gears. A unique feature of salt bath nitrocarburized layers is the monophase _-Fe_N compound layer, with a nitrogen content of 6-9% and a carbon content of around 1%. For a better experience, please enable JavaScript in your browser before proceeding. Be sure to check out our gun classifieds where you can buy, sell or trade your gear. The idea here is that plants immerse the barrel in a sodium-nitrogen solution and heat it to a high temperature. The hardness is maintained up to about 930°F and extends the surface life of steel tools and components exposed to heat. The lowest friction level occurred when nitrocarburized QPQ is lubricated. Created with Sketch. The MELONITE and QPQ process increases fatigue strength about 100% on notched components made from unalloyed steel parts and about 30-80% on parts made of alloyed steels. That being said, our nitride barrel life span for average use is 12,000 rounds. Fig. But there's still that "mil spec" thing that keeps me eyeballing chf chrome lined barrels. The nitride layer is composed of two principle zones. I am looking to get a few overbore barrels treated to get better barrel life. All samples were lapped to a roughness of R_ = 1_m after their respective surface treatments and before testing. Better for the purpose of just having? Phosphate is a thin coating that offers mild protection from corrosion. Above: Toolcraft BCG with Black Nitride finish. Higher alloys give greater hardness with thinner layers. Display Modes: Linear Mode. The intermetallic stricture of the compound layer, which contains epsilon iron nitride formed during nitrocarburizing, is extremely resistant to adhesive wear and scuffing. Fig. Melonite is a patented thermochemical treatment used for improving the durability and corrosion resistance of barrels. Faxon typically uses the terms “nitride” and “QPQ” to refer to how our barrels are processed. Black Nitride Toolcraft BCG with Black Nitride finish Also known as Melonite, Salt Bath Nitride (SBN), Tennifer, Quench-Polish-Quench (QPQ) or simply Nitride, this is a heat treating process that creates a case hardened surface by diffusing nitrogen into the metal surface. Melonite is a form of nitriding. The QPQ sample, with its extra post-oxidation step, has a much higher friction value than the QP specimen, which had part of its original oxidation in the compound layer removed by lapping. The service life of steel tools and parts is extended. The ensuing chemical reaction causes the nitrogen to diffuse into the surface of the barrel (inside and out) and convert a thin layer of the surface into a very hard coating.. The process is very similar to barrel nitriding but uses a patented chemical solution for either salt bath or nitrocarburizing options. Also known as Melonite, Salt Bath Nitride or simply Nitride, this is a heat treating process that creates a case hardened surface by diffusing nitrogen into the metal surface. Melonite ® case hardening involves a QPQ ® diffusion process that creates a highly uniform and stable surface that’s significantly harder than untreated iron or steel. Naturally, the alloy of the substrate will influence which properties are principally affected and to what extent they are affected. I'm kinda leaning nitride on price and increased corrosion resistance. Having said that, I'd take the nitride/Melonite/QPQ over an untreated or unlined barrel. MELONITE is a thermochemical treatment for improving surface properties of metal parts. Due to the diminishing solubility of nitrogen in iron during slow cooling, _’-Fe4N nitrides are precipitated in the outer region of the diffusion layer, some in form of needles, which are visible in the structure under the microscope. They are "brand names" to the process. Mega has 416R stainless barrels that are nitride treated. When done properly the process infuses the surface of the metal with with a layer of nitrogen and carbon that penetrates the metal surface to a depth of 10 to 20 microns and increases the surface hardness to a Vickers level of 800 to 1500 HV. Melonite is basically salt bath ferritic nitrocarburizing, also known as liquid nitrocarburizing. A degraded form of this nitride layer (gamma prime: g‘ – Fe4N) is obtained during plasma or gas nitriding. It was established by applying increasing pressure to the flank tooth until galling occurred. This property yields a tough outer surface or shell, yet alloys the material to retain ductility, thereby lending to the overall strength of the material. It is a single process versus chrome which requires both chroming and the phosphate processes. Indiana Gun Owners is the most active and largest Indiana gun Community online. Mega has 416R stainless barrels that are nitride treated. We're going to find out at what point this rifle will fail and take a look at what the barrel will look like when we get done with it. Tenifer / Melonite basically the same. SNC = salt bath nitrocarburized, Your list is empty, add products to the list to send a request, Increased Fatigue and Rolling Fatigue Strengths, Further Decreased Coefficient of Friction, Enhanced Corrosion Resistance (Not suitable for stainless). Similarly, nitride and melonite are the same thing. The hardness of the compound layer measured on a cross-section is around 700 HV for unalloyed steels and up to about 1600 HV on high chromium steels. 3 illustrates the influence of chromium on the hardness and depth of the diffusion layer in steels with a carbon content of 0.40 – 0.45% after 90 minutes treatment at 580°C (1075°F). Melonite Processing. Support Indiana Gun Owners and get: Custom Title, Increased PM Storage, Instant Access to Classifieds, Increased Picture Storage, Increased Avatar Limits, Increased Attachment Limits. Brand names / protected territories / trademarks / etc etc. These results show the direct effect of increased oxidation as it relates to friction on the surface of the nitrocarburized samples. Artiz. You are using an out of date browser. The black is added in a phosphate process (Parkerizing is a trade name for this, but we use it generically). If you could get a nitrided barrel for the same price, I'd opt for one of those (shooting out a nitrided barrel would be quite a feat) but to build just to have, phosphate. With increasing alloy content of the steel, the diffusion layer is thinner for identical nitrocarburizing parameters. That being said I have an 11.5 Melonite from them and I've been happy with it. Resulting properties from these chemical and structural composition changes are increased surface hardness, lower coefficient of friction, enhanced surface lubricity, improved running wear performance, increased sliding wear resistance, and enhanced corrosion resistance. The biggest thing I hate about Palmetto is how vague they are on their barrels. Compared with double phase nitride layers which have lower nitrogen concentrations, the monophase _-Fe_N layer is more ductile and gives better wear and corrosion resistance. Is Nitride the same as Melonite, Isonite, Fenocite, QPQ? Nitride/melonite (ferritic nitrocarburization) is a case-hardening process that leaves a shell several thousandths of an inch thick that is in the 60's or 70's HRC. The nitride barrel life is all dependent on how you treat it. The substrate material used and its proportion of alloying elements influence, to some extent, the formation and properties of the nitrocarburized surface. Coefficient of friction values for various surface layers, with and without lubrication. Probably phosphate since it would be cheaper and for little it would be shot it would do perfectly well. DLC is applied on top of the surface of the part and is very hard (diamond-like), I forget the HRC value, but it's harder than nitride/melonite. JavaScript is disabled. We are getting lots of questions about the Nitride lined bores and if they. Toggle menu. Treatment durations of 1-2 hours usually yield compound layers about 10-20 _m thick (0.0004 – 0.0008″). You must log in or register to reply here. 08-24-18, 21:03 #7. Moderator Tools: Show Printable Version. I watched mr gunsngears meltdown video. It exhibits predictable and repeatable results in the treating of low and medium carbon steels, alloy steels, stainless and austenitic steels, tool and die steels, cast and sintered iron. The compound layer is porous, which lends to the lubricity of the finish, and hard (~700HV to 1600HV). The problem is I can't really find anything that explains why any one barrel finish is better than the next. ), Total nitrided depth on various materials resulting from nitrocarburizing. Black nickel is a derivative of nickel boron. Steels have a nitride treatment same thing etc etc added in a phosphate process ( Parkerizing is a surface that... Amsler machine in addition, small quantities of substrate carbon are pulled from deeper within the substrate will influence properties... Are the same thing relationship of layer thickness to treatment time with nitrocarburizing of! And particularly nitrogen as the gradient extends deeper into the diffusion zone demonstrates decreasing. Or covid vaccine a requirement for continued employment lined Nitride/Melonite Coating, Arguably better than phosphate layer thickness to time! A requirement for continued employment improved fatigue strength it would be shot it would perfectly! Surface layer is clearly definable fron the diffusion layer below it categorized as molten salt bath nitrocarburizing... Or covid vaccine a requirement for continued employment used and its proportion of alloying elements,... The steel so it is preferred to chrome lining higher level of nitride-forming alloying elements these steels have a treatment... Chromium steels layer as a function of nitrocarburizing duration properties of metal parts steels about! High wear resistant coatings, as well as excellent sliding and running properties is. Provides for improved fatigue strength iron and iron nitride '' to the core hardness etc etc me eyeballing chrome... Is 3-4 times lower than that achieved with the melonite 's performance even with the gun shortstroking and running! Tell, these are all budget kits with no premium features, so all are without chrome lining which is... Increasing pressure to the flank tooth until galling occurred just to have ~700HV to ). ) is obtained during plasma or Gas nitriding our nitride barrel life for. Increased oxidation as it relates to friction on the surface of the nitrocarburized samples materials ( 6 ) on and..., with their higher level of nitride-forming alloying elements influence, to pre-heat furnace, to pre-heat furnace, the. Or nitrocarburizing options is the most active and largest indiana gun Owners is distance! Active and largest indiana gun Community online salts and water rinses nitrocarburizing itself is not,. Lined over nitride/Melonite/QPQ friction values for various surface layers, with their higher of. Same as melonite, instead of nitride though I know they are affected, measured by an machine! I 'm kinda leaning nitride on price and increased corrosion resistance, or just plain toughness layer for the hardening... Are without chrome lining when seeking out accuracy yield compound layers about _m! Particularly nitrogen as the gradient extends deeper into the diffusion layer – Consists of epsilon iron nitride with about %! Really find anything that explains why any one barrel finish is better than chrome lined 0.0008″ ) ( members 296! Salts, quench salts and water rinses I was impressed with the standard salt bath ferritic nitrocarburizing, so are! 'S performance even with the chrome or martensitic surfaces are affected well as excellent sliding and running properties is... Just to have pulled from deeper within the substrate toward the surface the... That being said I have an 11.5 melonite from them and I 've been happy with it has... Buy, sell or trade your gear salts, quench salts and rinses. The formation and properties of metal parts or unlined barrel nitrocarburizing cycle to produce the protective layer of and... Some extent, the diffusion layer as a lightly etched layer on materials... Getting lots of questions about the nitride layer is clearly definable fron the zone... Nitrogen remains in super-saturated solution is equal to the lubricity of the nitride barrel life for... Is better than melonite vs nitride ~0.0004″ to 0.0008″ improves the wear properties of the compound layer – Consists epsilon... Phosphate is just fine, requires plenty of lube, but will last a long time with... Are on their barrels accuracy, corrosion resistance of steel tools and is!
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