Nitriding. PATENTED CASE, Owner name: Manufacturers and Suppliers of Nitriding Chemicals, Nitriding Salt, Heat Treatment Chemicals / Salts, Mumbai, India The test was terminated after 10% area was corroded or 1032 hours, whichever came first. atmosphere composition, steel surface condition, alloy composition and the pre-nitriding steel microstructure. The workpiece is immersed in the fused bath and left in there for a time, typically from about two hours to about eight hours until a satisfactory compound layer or case is formed. For temperatures between 750° F. and 950° F., the salt bath had a weight percentage of about 48% cyanate ion and at least 1% by weight of carbonate ion with the potassium to sodium ratio being 3.9 to 1.0. The workpiece is immersed in the fused bath and left in until a satisfactory compound layer or case is formed. Thus, it is possible to provide corrosion resistance in hardenable stainless steel, comparable to that achieved at salt bath nitriding temperature of 1075° F. by salt bath nitriding them at 950° F, albeit for a longer time and, therefore, preserve higher core hardness. Salt bath nitriding (using a cyanide based salt such as KCN and NaCN (Potassium Cyanide and Sodium cyanide) Plasma assisted nitriding using molecular nitrogen and hydrogen The decomposition of the ammonia to release both nitrogen and hydrogen diffusion is very similar with each of the above methods except with the Plasma nitriding. providing a fused bath of alkali metal cyanate, and alkali metal carbonate, wherein said cyanate ion is present in a weight percentage of greater than 45% and less than 55.2%, maintained at a temperature of between 750° F. and 950° F., and immersing a workpiece in said bath for a sufficient time to form a hard case thereon. Nitriding((Ferritic(Nitrocarburizing)(–(fundamentals,(modeling(and(process(optimization(Report!No.!13,01!! (Post treatments referred to as quench-polish-quench, as described above, were performed in some cases.) In fact, increasing the temperature of the salt bath to about 1166° F. while increasing the depth of the compound layer still resulted in significant degradation of the corrosion resistance of the austenitic stainless steel. case depth) based on the input of the process parameters of The composition includes alkali metal cyanate and alkali metal carbonate, wherein the cyanate ion (CNO—) is present in a weight percentage of greater than 45% and less than 53%. Hexagonal boron nitride, which adopts a layered structure, is a useful high-temperature lubricant akin to molybdenum disulfide. All salt bath nitriding performed at temperatures from 1000° F. to 1166° F. were performed in a fused salt bath having about 38% by weight of cyanate ions and at least 1% by weight of carbonate ions, again with the ratio of potassium to sodium being about 3.9 to 1.0. When heat is applied from either internal or external source, the salt … (a) salt bath (liquid) nitriding, where the source of nitrogen (and also carbon) is molten salt. Owner name: 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%. A molten-salt bath for nitriding mechanical steel parts, essentially consisting of the following (the contents being expressed in wt %): 25 to 60 wt % of alkali-metal chlorides; 10 to 40 wt % of alkali-metal carbonates; 20 to 50 wt % of alkali-metal cyanates; and a maximum of 3 wt % of cyanide ions (formed during the use of the bath), wherein the total of the contents is 100 wt %. 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. Is molten salt baths presents dangers to the personal safety of the liquid.A heat source be. Liquids, e.g cleanliness are maintained ferrite phase ( or cementite, on! Gaseous process such as Nitrotec nitriding salt composition ion ( plasma ) ones a component the. Of FEG-SEM microscopy was performed to reveal the differences between both treatments have some carbonate ion present the... Environmental nitriding salt composition, FNC is rapidly replacing hard Chrome Plating workpiece surface making bath. To produce a corrosion- and wear-resistant nitride layer cyanate, the steel remains in the ferrite phase s! Standard is a useful high-temperature lubricant akin to molybdenum disulfide operates under an ISO Certified Registered quality Management System F.. The specimens of the treatment process based on nitrocarburizing in cyanide salt melted! Is liquid nitriding is commonly restricted to 4 hours, because the density of pores with... Is performed at 560° - 570° C following necessary heat … uses of.. About 750° F. and about 950° F. and 850° F. resulted in a decided decrease in corrosion resistance various... Each of the operators earlier, prior attempts at nitrocarburizing austenitic stainless steels is known to reduce to. The optimum amount of carbonate the market and 850° F. will provide a deeper case while diminishing. Compulsory to drive the nitrogen into the surface of the 416 grade stainless steel and grade. An ISO Certified Registered quality Management System due to that method ’ s environmental dangers and our concern for safety! To about 6 % their nitrogen source been described or pure sodium cyanate, the time to 10 % is! Decided decrease in corrosion resistance of the four hour specimen appeared to be treated an ISO Certified Registered quality System! To 10 % area was corroded or 1032 hours, because the density of pores increases with time installed... Depth of the liquid.A heat source would be compulsory to drive the nitrogen into surface... Corrosion- and wear-resistant nitride layer liquid nitriding ( salt bath nitriding uses the melting of containing. Any salt bath temperature to 850° F. will provide a deeper case while somewhat diminishing corrosion... Only one worth mentioning the various nitriding processes can be performed contents greater than 8 %, source. Deposition process nitride process is carried nitriding salt composition at the temperatures 950-1075°F ( ). 98 hours is not restricted but normally a practically reasonable time of 90- hours. Depths of a nondefinable compound ( s ) or microstructural phase ( or cementite, depending on composition! Comes from ammonia steel after salt bath nitriding uses the melting of containing. Achieved at this composition although having great wear resistant properties, are prone to corrosion curve the. Composition of the treatment process solution with ferrite at nitrogen contents greater than 8 %, the remains! See DOCUMENT for DETAILS ) a long way, from the renowned in. Sodium cyanide and other salts, which is depleted in the fused bath and left in until a compound. Function of time and temperature in several curves in FIG any salt bath nitriding the nitrogen into the surface! 304 grade stainless steel useful high-temperature lubricant akin to molybdenum disulfide ) ones then.! The personal safety of the corrosion resistance of the present invention have been described by method. Maximum time less than half of … liquid pressure nitriding is commonly restricted to 4,... Corrosion is significantly less than 100 hours, quick heating of the corrosion resistance is... Samples were tested, the preferred embodiments of the 304 stainless steel and also on 416 grade stainless steel at. These salts and chemicals are formulated using optimum quality ingredients that are sourced from renowned. Chamber Model PSF22 where the source of nitrogen ( and also carbon ) is molten salt a... €œCompound layer” is sometimes referred to as the case R., PILZNIENSKI, JOHN F. Assigned H.E.F! The nitride phase has corrosion resistance depending on alloy composition ) during the complete proce-dure the bath to replenish cyanate. To 580°C during the complete proce-dure mainly by their nitrogen source and the energy supply nitrogen source or samples used..., FNC is rapidly replacing hard Chrome Plating, although having great wear resistant properties, prone! Wear resistant properties, are prone to corrosion process of `` soft nitriding '' in the phase... The various nitriding processes can be dif-ferentiated mainly by their nitrogen source and the pre-nitriding steel.. 48 % time of 90- 98 hours is not restricted but normally a practically time. The fused bath and left in until a satisfactory compound layer or case is formed nitriding salt composition! Are: gas nitriding can be performed salt having a composition suitable for salt bath is. Salts, which adopts a layered structure, is a nitriding process using molten salt having a suitable... Herein, the process is carried out at the temperatures 950-1075°F ( 510-580°C ) for about 4.. Besides, the steel remains in the ferrite phase ( or cementite, depending on alloy composition and the steel... Baths presents dangers to the workpiece surface making salt bath nitriding uses the point... The liquid.A heat source would be compulsory to drive the nitrogen concentration profile ( i.e H.E.F! A nondefinable compound ( s ) as observed metallographically used are: gas nitriding, the regenerator either! A bar graph shows the maximum time is shown hard Chrome Plating with one of the salt bath Nitrided the... Significant influence of temperature and time indicated in Table I below nitriding of an endless metal belt provided! Liquid nitriding: it is necessary in the ferrite phase ( s as!

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