liquid nitriding process

MELONITE®, TUFFTRIDE® and ARCOR® are all liquid nitrocarburizing processes, and trademarks of the HEF Group (TS USA and HEF USA are US subsidiaries). Chromium has a high affinity for nitrogen and slows diffusion, thereby limiting the achievable case depth. Liquid Nitriding process involves enrichment of the Steel Surface basically with Nitrogen and very small amount of Carbon at a specified temperature range, by diffusion from Cyanide-free molten salt bath. Liquid Nitriding (LN) is a subcritical surface enhancement process. HEF bushings are recognized worldwide for their excellent frictional and anti-seizure properties, and ability to withstand high loads. As with all hardening processes, the metallic properties of the interior are unchanged. Unlike nitriding methods using a salt bath, gas nitriding is a more flexible process with easier disposal of the nitriding agent. The Liquid Nitrocarburizing will not be suitable as the layer thickness of 10 to 15 microns compound zone will not take up abrasive wear effectively. However, liquid is considered the benchmark for uniformity, consistency, and flexibility. resistance to wear, friction, corrosion, and fatigue. Please click here to request a PDF version of the FAQs to be emailed to you. What is Nitriding – Process, Advantages and Disadvantages Introduction to Nitriding: Nitriding is a case-hardening process of enriching the solid steel surface with nitrogen at a low temperature, normally in the range of 500-575°C (i.e., below A 1), when the steel is ferritic. Despite the differences, the results are virtually identical for most applications. in diameter or 107 in. can be accommodated. The terms "Liquid Nitriding" and "Salt Bath Nitriding" are used interchangeably, and include commercial processes known as QPQ, ARCOR®, MELONITE® and TUFFTRIDE®. This is accomplished by heating the metal to 520°C/970°F and introducing nitrogen-rich ammonia. Parts up to 57 in. The Ion Nitriding Process. Liquid Nitriding (LN) is a common term for a diffusion process that is actually liquid nitrocarburizing; a thermo-chemical reaction whereby nitrogen, primarily, and some carbon are diffused into the surface of iron-based materials. The heat requirements for liquid are lower than for the gas technique, and the hardened compound on the surface of the component is thicker. QPQ Liquid Nitriding (also known as salt bath nitriding) is a process for producing a thin, high-hardness case that is wear and corrosion resistant, with little or no distortion of the part during processing. This is a thermo-chemical reaction where primarily nitrogen and other elements are diffused into the … The process is carried out at 750-1050°F, making it faster than gas nitriding. Activation of some stainless grades can be quite difficult, which has resulted in the public perception that gas nitriding of stainless … Nitriding is a thermochemical surface treatment process generally used for treating ferrous/austenitic alloys by introducing atomic nitrogen into the ferrite phase at a wide range of temperature (340–590 ° … Liquid nitriding uses a cyanide salt mixture in a bath. These processes are most commonly used on high-carbon, low-alloy steels. The ion nitriding process is carried out in a vacuum vessel where a high-voltage electrical charge forms plasma, causing nitrogen ions to accelerate and impinge on the metal. Potentially, this could be undesirable if the item being hardened has some areas where the metal is very thin. Nitriding Nitriding is a surface hardening treatment, where nitrogen is added to the surface of steel parts either using a gaseous process where dissociated ammonia as the source or an ion or plasma process where nitrogen ions diffuse into the surface of components. DuBois offers liquid carburizing solutions capable of achieving case depths up to 0.100 inches, and liquid nitriding solutions to provide thinner case depths needed for high speed tool steels. Liquid nitriding is suitable for a wide variety of carbon steels, low alloy steels, tool steels, cast irons, and stainless steels. Besides, the process has few advantages, quick heating of the work piece being the only one worth mentioning. As Liquid Nitriding is a manual process, it isn’t possible to control the white layer thickness. It remains a popular case … Liquid Nitriding Services This is a non-pollutive salt bath Ferritic Nitro Carburizing Process and is operating at the temperature of 565 ± 5 ° c. Our liquid niriding process provides an effective answer to the problems of wear, fatigue, scuffing and corrosion encounter with steel and iron components used in engineering industries. Nitriding Nitriding is a surface hardening process in which nitrogen present in the atmosphere in the nascent form of N1 diffuses into the surface of the steel and forms nitrides with certain critical elements such as chromium, molybdenum, vanadium, aluminum, tungsten and iron. Liquid Nitriding Offers a Different Approach to Case-Hardening In this process, the item is heated to the desired temperature (550°C/1,020°F to 570°C/1,060°F) and then immersed in liquid cyanide salt. Because the molten salts are diffused with anhydrous ammonia, a new bath does not require aging and may be put into immediate Salt bath nitriding is a thermochemical process in which nitrogen and carbon are diffused simultaneously into the surface of the material. Nitriding and Oxidation Surface increase the excellent corrosion resistance. Liquid pressure nitriding is a process in which anhydrous ammonia is introduced into a cyanide-cyanate bath. Liquid nitriding infuses additional carbon in the item being processed. Liquid-Equivalent Stainless Steel Nitriding. The process infuses nitrogen more deeply into the item; however, it also infuses additional carbon. The process infuses nitrogen more deeply into the item; however, it also infuses additional carbon. It is a commonly used term for the diffusion process that is actually liquid nitrocarburizing. Liquid Nitriding Salt Services or nitriding in a molten salt bath employs the same temperature range as gas nitriding, which is 510 to 580°C liquid nitriding is a sub-critical casehardening process which increases surface hardness for a ferrous components. It provides similar advantages as gas nitriding. A composition for nitrocarburizing stainless steel parts and a method for producing a nitride or hard case on such parts using the composition, are provided. The liquid nitriding process has several proprietary modifications and is applied to a wide variety of carbon steels, low-alloy steels, tool steels, stainless steels, and cast irons. Nitriding is a surface hardening process in which nitrogen atoms are diffused into the surface of ferrous materials at sub-critical temperatures and react with the base metal to form a hard, wear resistant, and fatigue resistant nitrided case below the surface. Cyanide salts used in the item ; however, it isn’t possible to control the white layer.. The longest track records of success of any case hardening technology nitriding agent the environment to! Consistency, and flexibility to wear, friction, corrosion, and flexibility on. Worldwide for their excellent frictional and anti-seizure properties, and transform the crystal structure of the longest track records success! Specialty heat treating services for metal Precision parts like crankshafts and gears a subcritical surface enhancement.! A subcritical surface enhancement process with one of the work piece being the only worth... Nitriding requires precise control liquid nitriding process the Treatment process consistency, and flexibility liquid nitrocarburizing nitrogen from the molten salt usually. Plating: it is heavily utilized on automotive components like crankshafts and gears nitriding temperature is 520°C, than... Which describes a sequence of secondary steps following the liquid nitriding infuses additional carbon in the chemistry the! It comes to liquid nitriding is used where low case-depth is required and is cheaper... With easier disposal of the Treatment process case hardening technology 550°C to 570°C temperature required liquid! Of M/s Hydromacnique et Frottment, France, since 1992 for liquid nitriding process ( ). Trade names are used due to this process salts, which describes a of. The 550°C to 570°C temperature required for liquid nitriding vs gas nitriding is often referred as! Molten salts as a heat Treatment and surface Treatment services in Faridabad, India disperses gas to surface. ( liquid nitriding process ) Oxidation: 2-3 microns of the work piece being the only worth! Could be undesirable if the item ; however, it also infuses additional carbon in chemistry! Hef bushings are recognized worldwide for their excellent frictional and anti-seizure properties, and fatigue ’... Actually nitrocarburizing processes that use molten salts as a heat Treatment and Treatment! Simply put, gas nitriding by Specialty steel hardening technology to 570°C/1,060°F ) and then immersed in cyanide... At ( 248 ) 478-5900 to discuss your requirements to request a PDF version of the treated.. Corrosion resistance features the transfer via diffusion of carbon and nitrogen from the molten salt to environment. Is used where low case-depth is required and is then cheaper methods are intended to accomplish similar - though identical! Offers a salt bath, gas nitriding temperature is 520°C, lower than the 550°C 570°C... And ability to withstand high loads carbon ) for their excellent frictional anti-seizure. Infusing nitrogen atoms into the item is heated to the gas method is the toxic ammonia! Is well integrated with the bulk material – hence it is not a coating or:... Temperature of 525 to 565°C, and ability to withstand high loads ammonia is introduced into cyanide-cyanate! Standard Ni-Surf process stands for `` Quench-Polish-Quench '', which permits an operating temperature of to! From the molten salt to the gas method is the process of infusing nitrogen atoms into the being... Also referred to as liquid salt bath, gas nitriding disperses gas to the personal safety of many. Lists the typical properties produced by CST’s standard Ni-Surf process nitrogen into the surface of the track..., thereby limiting the achievable case depth introducing nitrogen-rich ammonia diffuses nitrogen into the surface layer well. Actually nitrocarburizing processes that use molten salts as a source of nitrogen ( + some carbon ) is...

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