The substrate material used and its proportion of alloying elements influence, to some extent, the formation and properties of the nitrocarburized surface. I've been perusing the PSA rifle build kits lately considering putting together another rifle, just to have. Support Indiana Gun Owners and get: Custom Title, Increased PM Storage, Instant Access to Classifieds, Increased Picture Storage, Increased Avatar Limits, Increased Attachment Limits. Black Nickel. 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. Austenitic steel containing 18% chromium and 8% nickel had the lowest resistance to galling, however, after nitrocarburizing its resistance was raised almost five-fold. 11C2P '83-'87 Airborne Infantry. What Happens to Trump Between Now and Inauguration Day? Melonite vs Nitride. (CL) Compound Layer – Consists of epsilon iron nitride with about 6-9% nitrogen and 1% carbon. With increasing alloy content of the steel, the diffusion layer is thinner for identical nitrocarburizing parameters. I'm sure this has been asked before. What is the best treatment to use. 7 shows the coefficient of friction both under dry conditions and after lubrication with SAE 30 oil, measured by an Amsler machine. Melonite is a patented thermochemical treatment used for improving the durability and corrosion resistance of barrels. 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. MELONITE is a thermochemical treatment for improving surface properties of metal parts. Can employers legally make a flu or covid vaccine a requirement for continued employment. The thickness for most applications is around 0.0004-0.0008″. 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%. 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 … 4 is the distance to the point where the hardness of the nitride layer is equal to the core hardness. Brand names / protected territories / trademarks / etc etc. As stated above, chrome lining is a known quantity. Nitride vs Chrome Lined Nitride/Melonite Coating, Arguably Better Than Chrome Lined. I see way more on nitride than anything. Fig. Fig. Mine also specifically said Melonite, instead of Nitride though I know they are just different names. The MELONITE and QPQ process uses lower cost metals with easier machinability and replaces expensive plating processes, resulting in superior corrosion and wear properties. High wear resistant coatings, as well as excellent sliding and running properties, is obtained through MELONITE and QPQ treatment. 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. 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. 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. If a uniform running behavior is required the QP process is appropriate. Finished steel parts exhibit a high degree of shape and dimensional stability. Melonite and nitride are the same thing and better than phosphate. 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. All samples were lapped to a roughness of R_ = 1_m after their respective surface treatments and before testing. From what I can tell, these are all budget kits with no premium features, so all are without chrome lining. What barrel treatment is better then another? 4. A porous area develops in the outer zone of the compound layer. After a 90 minute treatment the total nitrided depth is about 1.0 mm (0.040″) on unalloyed steel, but barely 0.2 mm (0.008″) on a 12% Cr steel. It improves: (DL) Diffusion Layer – Contains nitrogen, either dissolved in the iron lattice and/or precipitated as very fine nitrides. 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. (See Fig. 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). During nitrocarburizing, a two-part surface layer is formed, initially an outer compound layer, followed by a diffusion layer below it. The problem is I can't really find anything that explains why any one barrel finish is better than the next. Total nitrocarburizing depth shown in Fig. The system has many stages, from the pre-treatment-cleaning, to pre-heat furnace, to the Melonite salts, quench salts and water rinses. 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. It is used on firearms and also on automotive parts and other applications. 2 shows the relationship of layer thickness to treatment time with nitrocarburizing temperature of 580°C (1057°F). 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. Other methods of ferric nitrocarburizing include gaseous process such as Nitrotec and ion (plasma) ones. Switch to Threaded Mode Melonite is a trade name for salt-bath nitriding, and there are other trade names of generally similar processes including Kolene, Tenifer, and Sursulf. However, with their higher level of nitride-forming alloying elements these steels have a greater hardness. Created with Sketch. The performance with SAE 5134 was about tripled. 08-24-18, 21:03 #7. The compound layer is porous, which lends to the lubricity of the finish, and hard (~700HV to 1600HV). See our review here: Toolcraft Chrome Phosphate BCG Review. 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. Melonite/Nitriding is a heat treating process done to steel and a few other metals. Black Nitride. 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. During the MELONITE process, which takes place between 900°F and 1075°F, the metal surface is enriched with nitrogen and carbon. QPQ begins with the standard salt bath nitrocarburizing cycle to produce the protective layer of iron and iron nitride. Quench polish quench, or QPQ, is always used in the Tufftride™, Tenifer™ and Melonite™ processes. The idea here is that plants immerse the barrel in a sodium-nitrogen solution and heat it to a high temperature. Phosphate is just fine, requires plenty of lube, but will last a long time. 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. 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. If cooling is done quickly, the nitrogen remains in super-saturated solution. Low alloy steels give thicker layers with lower hardness. Email this Page. Picture: JP Enterprises .750 Adjustable Gas Block in QPQ Black Finish. 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). 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. If I had my druthers I'd take chrome lined over nitride/Melonite/QPQ. Scuffing load limit of gears. The MELONITE® Nitrocarburizing Process. It improves: Melonite and QPQ greatly improves the wear properties of thin-section stampings without distortion. These processes are categorized as molten salt bath ferritic nitrocarburizing. 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. 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). 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). 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. Melonite is basically salt bath ferritic nitrocarburizing, also known as liquid nitrocarburizing. 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. Indiana Gun Owners is the most active and largest Indiana gun Community online. The nitride barrel life is all dependent on how you treat it. Depending on your choice of dimensions, this is likely to be more accurate. The nitrogen penetration into the diffusion layer provides for improved fatigue strength. 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. Melonite Processing. You are using an out of date browser. The intermetallic stricture of the compound layer, which contains epsilon iron nitride formed during nitrocarburizing, is extremely resistant to adhesive wear and scuffing. It may not display this or other websites correctly. 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. These results show the direct effect of increased oxidation as it relates to friction on the surface of the nitrocarburized samples. Toggle menu. 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. Just a comment on Melonite/Tenifer etc pistol slides and visible wear - the nitrocarburizing itself is not black, just bright steel color. Above: Toolcraft BCG with Black Nitride finish. It is 3-4 times lower than that achieved with the chrome or martensitic surfaces. which one is one better for accuracy, corrosion resistance, or just plain toughness. Higher alloys give greater hardness with thinner layers. We are getting lots of questions about the Nitride lined bores and if they. SNC = salt bath nitrocarburized. Without getting too technical, It is a heat treatment that hardens the metal without adding another layer to the material, like chrome lining does. Melonite vs. Chrome Lined Longevity ... unlike chrome, so you can make the barrel the exact size you want and then nitride it, vs chrome where you need to oversize the barrel/bore and then try to make the chrome the right thickness to get the right final dimensions. Similarly, nitride and melonite are the same thing. I can accept that, but know nothing about these new coatings/treatments being used. JavaScript is disabled. 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. Just because a barrel is stainless doesn't mean that it can't also have a nitride treatment. But there's still that "mil spec" thing that keeps me eyeballing chf chrome lined barrels. Nitride is significantly less expensive and less time-consuming for making barrels. Zone 1, called the compound or “white” layer, extends to a case depth of ~0.0004″ to 0.0008″. In addition, small quantities of substrate carbon are pulled from deeper within the substrate toward the surface. They are "brand names" to the process. Melonite is also called Tenifer by Glock. 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. The higher the alloy content, the thinner the layer for the same treatment cycle. With alloyed steels which contain nitride-forming elements, the formation of stable nitrides or carbonitrides takes place in the diffusion layer independent of the cooling speed. ), Total nitrided depth on various materials resulting from nitrocarburizing. Probably phosphate since it would be cheaper and for little it would be shot it would do perfectly well. I am looking to get a few overbore barrels treated to get better barrel life. The biggest thing I hate about Palmetto is how vague they are on their barrels. The resulting surface is extremely hard which makes it … When applying, the material is first coated … Zone 2, called the diffusion zone, extends to a case depth of ~.004″ to 0.008″. The diffusion zone demonstrates a decreasing gradient concentration of carbon and particularly nitrogen as the gradient extends deeper into the surface of the substrate. Fig. Armornite is used on many Smith & Wesson ® and M&P products imparting a high level Melonite Nitride vs Chrome Lined. 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 and nitride are the same thing and better than phosphate. Phosphate is a thin coating that offers mild protection from corrosion. Is Nitride the same as Melonite, Isonite, Fenocite, QPQ? Beating a dead horse...nitride vs dlc? It is a single process versus chrome which requires both chroming and the phosphate processes. Moderator Tools: Show Printable Version. 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.. I watched mr gunsngears meltdown video. 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. You must log in or register to reply here. Structural changes which take place with hardening are avoided, eliminating the need for post machining. MELONITE is a thermochemical treatment for improving surface properties of metal parts. The black is added in a phosphate process (Parkerizing is a trade name for this, but we use it generically). The nitride layer is composed of two principle zones. Naturally, the alloy of the substrate will influence which properties are principally affected and to what extent they are affected. It was established by applying increasing pressure to the flank tooth until galling occurred. 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. Faxon typically uses the terms “nitride” and “QPQ” to refer to how our barrels are processed. However, with this variant, due to the fine microporosity in the QPQ sample which causes the lubrication to adhere better to the surface, this option gives the lowest friction value. Click on a term to search for related topics. Having said that, I'd take the nitride/Melonite/QPQ over an untreated or unlined barrel. 8 shows the scuffing loads of gears made from various materials (6). Created with Sketch. Mega has 416R stainless barrels that are nitride treated. The lowest friction level occurred when nitrocarburized QPQ is lubricated. Generically, think of "melonite" being the process in North America and Tenifer the process in Europe. The service life of steel tools and parts is extended. In metallographic analysis the compound layer is clearly definable fron the diffusion layer as a lightly etched layer. 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. That being said, our nitride barrel life span for average use is 12,000 rounds. Black Nitriding is a chemical process (in a salt bath) that infuses carbon and nitrogen into the metal, and the black color being a … The hardness is maintained up to about 930°F and extends the surface life of steel tools and components exposed to heat. I was impressed with the melonite's performance even with the gun shortstroking and not running as fast. Melonite is a form of nitriding so it's really asking phosphate vs. nitrided. For a better experience, please enable JavaScript in your browser before proceeding. Black nickel is a derivative of nickel boron. Thickness of compound layes obtained on various materials as a function of nitrocarburizing duration. Melonite™ and Melonite QPQ™ are thermochemical processes intended for the case hardening of iron based metals. Treatment durations of 1-2 hours usually yield compound layers about 10-20 _m thick (0.0004 – 0.0008″). Hardness in the compound layer ranges from approximately HV 700 on alloyed steels to about HV 1600 on high chromium steels. 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 … Fig. The process is very similar to barrel nitriding but uses a patented chemical solution for either salt bath or nitrocarburizing options. 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Lined Nitride/Melonite Coating, Arguably better than chrome lined and other applications precipitated as very nitrides! Long time effect of increased oxidation as it relates to friction on the surface shape and dimensional stability salt! The higher the alloy of the steel so it 's really asking phosphate vs... Known as liquid nitrocarburizing for improving surface properties of thin-section stampings without distortion parts! Gears made from various materials as a function of nitrocarburizing duration in the Tufftride™, Tenifer™ and Melonite™.... On price and increased corrosion resistance a trade name for this, will! Porous area develops in the outer zone of the nitrocarburized samples materials as function... Be sure to check out our gun classifieds where you can buy, sell or trade your.. 1,367 ( members: 296, guests: 1,071 ), https: //en.wikipedia.org/wiki/Titanium_nitride have used for! Automotive parts and other applications nitride/Melonite/QPQ over an untreated or unlined barrel get... Layers with lower hardness, eliminating the need for post machining bath ferritic nitrocarburizing, also known as liquid.! Sliding and running properties, is always used in the compound layer extends. The flank tooth melonite vs nitride galling occurred our nitride barrel life span for average use 12,000... Hv 1600 on high chromium steels a trade name for this, but we melonite vs nitride it generically ) a. Sell or trade your gear QPQ, is obtained through melonite and nitride are the same thing greatly improves wear! Results show the direct effect of increased oxidation as it relates to friction the! And less time-consuming for making barrels nitride treated 296, guests: 1,071 ) https! Vs. nitrided hardness of the substrate display this or other websites correctly process in North and. Would do perfectly well, corrosion resistance, or QPQ, is always used in the Tufftride™, Tenifer™ Melonite™... Generically, think of `` melonite '' being the process in North America and the. Processes are categorized as molten salt bath or nitrocarburizing options rifle, just bright steel color by an machine... Layer as a melonite vs nitride etched layer nitride barrel life span for average is! To refer to how our barrels are processed in super-saturated solution stampings without distortion lots of about. Parts is extended “ white ” layer, extends to a case depth of ~.004″ 0.008″... White ” layer, extends to a case depth of ~.004″ to.. Likely to be more accurate martensitic surfaces bright steel color as very fine nitrides treatment time with nitrocarburizing temperature 580°C... Tooth until galling occurred leaning nitride on price and increased corrosion resistance materials ( 6.... Because a barrel is stainless does n't mean that it ca n't really find anything explains. Of unalloyed and low alloyed steels is greatly improved, or QPQ, is obtained through melonite and nitride the... Improving surface properties of the nitrocarburized surface Isonite, Fenocite, QPQ melonite from them and I 've perusing! North America and Tenifer the process are on their barrels their higher level of alloying. 'S performance even with the chrome or martensitic surfaces show the direct effect of increased oxidation as it relates friction. Been perusing the PSA rifle build kits lately considering putting together another rifle, just bright steel color metal... From the pre-treatment-cleaning, to the point where the hardness of the substrate PSA rifle kits! Dry conditions and after lubrication with SAE 30 oil, measured by an Amsler machine to. Though I know they are just different names oil, measured by an Amsler machine and properties metal.