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. Process Selection and Quality Control. The bath contains sodium cyanide and other salts, which permits an operating temperature of 525 to 565°C. The process infuses nitrogen more deeply into the item; however, it also infuses additional carbon. These steps entail the sequence: (1) OXIDATION: 2-3 microns of the surface layer is transformed to an iron oxide. Houston Unlimited, Inc. offers a salt bath nitriding process, also referred to as liquid salt bath ferritic nitrocarburizing. The process infuses nitrogen more deeply into the item; however, it also infuses additional carbon. Activation of some stainless grades can be quite difficult, which has resulted in the public perception that gas nitriding of stainless … Salt Bath Basics. Nitriding, or, nitrocarburizing, can be accomplished using four different media: 1) Liquid; 2) Gas; 3) Plasma; and 4) Fluidized Bed. 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. Both processes case-harden items but consider the following differences before choosing a method. The heat requirements for liquid are lower than for the gas technique, and the hardened compound on the surface of the component is thicker. MELONITE®, TUFFTRIDE® and ARCOR® are all liquid nitrocarburizing processes, and trademarks of the HEF Group (TS USA and HEF USA are US subsidiaries). 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. 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. Simply put, gas nitriding is the process of infusing nitrogen atoms into the surface of items made of steel and other metals. Liquid Nitriding (LN) is a subcritical surface enhancement process. Please click here to request a PDF version of the FAQs to be emailed to you. These ARCOR® treatments provide a more robust and consistent compound layer; are operationally easier to control and environmentally friendlier than other liquid nitriding treatments. HEF USA • 2015 Progress Drive • Springfield, OH 45505 • Ph: 937.323.2556 • Fax: 937.323.5787 • Email Us • Sitemap, Liquid Nitriding properties / miscellaneous. The exterior of the item is hardened, leaving the metallic properties of the interior unchanged. 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. The life span of the product increases due to this process. "QPQ" stands for "Quench-Polish-Quench", which describes a sequence of secondary steps following the liquid nitriding step. We are franchise of M/s Hydromacnique et Frottment, France, since 1992 for Liquid Nitriding Process (Sursulf). It is heavily utilized on automotive components like crankshafts and gears. True heat treating processes operate at higher temperatures, and transform the crystal structure of the steel to produce the desired mechanical properties. When the nitrogen ions bombard the part they heat up the … The Ion Nitriding Process. 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. The hallmark of salt bath nitriding is the bath of molten salt (usually cyanide or other salts) into which parts are submerged. Unlike nitriding methods using a salt bath, gas nitriding is a more flexible process with easier disposal of the nitriding agent. in diameter or 107 in. Liquid nitriding infuses additional carbon in the item being processed. 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. They are also used on medium and high-carbon steels, titanium, aluminium and molybdenum. This is done by immersing the parts in specially formulated 'salts' between 400°C - 425°C (750°F -800°F); (2) POLISHING: to improve surface finish and (3) RE-OXIDATION: to recover the oxide layer thickness that may have been lost during the polishing step. 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. This modified surface layer is well integrated with the bulk material – hence it is not susceptible to flaking or peeling. The composition includes alkali metal cyanate and alkali metal carbonate, wherein the cyanate ion is present in a weight percentage of greater than 45% and less than 55.2%. Gas Nitriding is a low temperature case hardening process that is ideal for producing hardened surfaces on pre-heat treated alloy steels such as 4140 and 4340, pre-heat treated tool steels such as H13, and specialty grades such as Nitralloy 135M. Potentially, this could be undesirable if the item being hardened has some areas where the metal is very thin. 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. HEF bushings are recognized worldwide for their excellent frictional and anti-seizure properties, and ability to withstand high loads. 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. Parts up to 57 in. Liquid-Equivalent Stainless Steel Nitriding. 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