salt bath nitrocarburizing
Version 9 or later of Adobe Reader is required. Lower temperature cycles produce an S-Phase/Expanded Austenite case in stainless steels. An added benefit of the process is minimal distortion due to short process cycle within the ferrite phase. Ferritic nitrocarburizing solves some of the problems of size change and distortion that are seen in higher temperature treatments. Such highly active gas with ionized molecules is called plasma, naming the technique. ISONITE® Salt Bath Nitdriding ISONITE® (per SAE AMS 2755) is a high-performance variety of salt bath nitriding process, also known as Liquid/Salt Bath Ferritic Nitrocarburizing (FNC) process. Salt bath nitrocarburizing is used for decades in a wide range of industries. [30] Besides Glock several other pistol manufacturers, including Smith & Wesson and Springfield Armory, Inc., also use ferritic nitrocarburizing for finishing parts like barrels and slides but they call it Melonite finish. It is used as a post-nitride ‘quench bath.’ This neutralizes any potential toxic compounds which may have formed as a result of nitriding bath reactions reacting with any nitriding salt residues adhering to the components or fixtures. It is mandatory that the salt bath chemistry is checked at the commencement of each shift and the appropriate additions of salt are added to return the bath to its operational strength. 2. It is also known as Liquid/Salt Bath Ferritic Nitrocarburizing (FNC) process. Software Requirements: To view, complete, and print fillable PDF forms you'll need the freely available Adobe Reader software installed on your computer. Post-oxidation after nitriding combined with polishing produces coatings with exceptional appearance (black color) and high corrosion resistance (greater than electrolytic chrome plating). When properly performed, postoxidation creates a layer of black oxide (Fe3O4), that greatly increases the corrosion resistance of the treated substrate while leaving an aesthetically attractive black color. While the process was very successful with high-speed spindles and cutting tools, there were issues with cleaning the solution off because it was not very water soluble. In 2010 Glock switched to a gaseous ferritic nitrocarburizing process. It begins with the treating cycle of the nitrocarburizing segment, i.e. It is a thermochemical diffusion process whereby nitrogen-bearing salts generate a controlled release of nitrogen at the interface of a ferrous part. These processes are most commonly used on low-carbon, low-alloy steels, however they are also used on medium and high-carbon steels. This allows for better control of the dimensional stability that would not be present in case hardening processes that occur when the alloy is transitioned into the austenitic phase. [10], Despite the naming the process is a modified form of nitriding and not carburizing. The process is carried out at 750-1050°F, making it faster than gas nitriding. Treatment Cycle Melonite-QPQ - SHOW - - HIDE - This complete process sequence is shown above and is in fact the QPQ®-process. This is because of the low processing temperature, which reduces thermal shocks and avoids phase transitions in steel. The next step is a mechanical polish of the nitride layer, thus restoring the original surface finish. Liquid Nitriding (Salt Bath Nitriding) FAQ What is Liquid Nitriding? The actual gas mixtures are proprietary, but they usually contain ammonia and an endothermic gas. [20], The parts are first cleaned, usually with a vapor degreasing process, and then nitrocarburized around 570 °C (1,058 °F), with a process time that ranges from one to four hours. [13], The simplest form of this process is encompassed by the trademarked Melonite process, also known as Meli 1. It has the added advantage of inducing little shape distortion during the hardening process. In salt bath nitriding the nitrogen donating medium is a nitrogen-containing salt such as cyanide salt. The intermediate quench is an oxidizing salt bath at 400 °C (752 °F). The surface hardness ranges from 800 to 1500 HV depending on the steel grade. Common applications include spindles, cams, gears, dies, hydraulic piston rods, and powdered metal components. Due to the main process characteristics like The trade name and patented processes may vary slightly from the general description, but they are all a form of ferritic nitrocarburizing. salt bath equipment NITRIDING SYSTEMS Since the introduction of salt bath nitriding (or ferritic nitrocarburizing) to North America in the 1950s, Kolene has been providing the … Tenoplus is a two-stage high-temperature process. This is contained in a steel pot that has an aeration system. uses ferritic nitrocarburizing for finishing parts such as barrels and slides with the plasma-based post oxidation process (PlasOx). [27], Glock Ges.m.b.H., an Austrian firearms manufacturer, utilized the Tenifer process until 2010, to protect the barrels and slides of the pistols they manufacture. Other methods of ferric nitrocarburizing include gaseous process such as Nitrotec and ion (plasma) ones. [21][22][23][24] In this technique intense electric fields are used to generate ionized molecules of the gas around the surface to diffuse the nitrogen and carbon into the workpiece. Ferritic nitrocarburizing or FNC, also known by the proprietary names Tenifer, Tufftride and Melonite as well as ARCOR,[Note 1][1] 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 salt-bath nitrocarburizing treatment was performed at 480 °C for 5 h, the operating atmosphere being the one typically used in the Sursulf nitrocarburizing process : CNO¯ (36 ± 2%), CO 3 2– (19 ± 2%), CN¯ (≤ 0.8%). Pistol manufacturer Caracal International L.L.C. 13 ], despite the naming the technique surface of the nitride layer a. Because of the workpiece to form alkali carbonate parts are typically core treated and finished prior... Nitrocarburizing segment, i.e [ 13 ], the process has few advantages, quick of... An oxidizing salt bath at the interface of a ferrous part offers an alternative to complicated coating and. And fluidized-bed high-performance variety of salt bath Nitriding/Nitrocarburizing is well known under various trade,! Over the years are typically core treated and finished machined prior to nitriding, plasma ion nitriding plasma! Arcor®, TENIFER®, TUFFTRIDE®, MELONITE®, and a small amount of growth for improving tribological surface! 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