The successful gas nitriding process control depends on: 1) process parameters selection to meet the specification, 2) accurate process parameters control during the process. 2 The gas nitriding process parameters include temperature, time, and the nitriding atmosphere. The process is carried out in a liquid salt bath at a subcritical treatment temperature, typically 1075°F (580°C). This results in improved wear resistance, lubricity, fatigue strength, and corrosion resistance. Quench Polish Quench (QPQ) Nitrocarburizing can also be enhanced by incorporating a sequence of treatments consisting of Definition Nitriding is a thermochemical, case-hardening process that involves the diffusion of nitrogen into a steel surface. After stress relieving, hardening and tempering are normally conducted before the steel is nitrided. Nitrocarburizing processes are conducted on steel components, e.g. valves, connecting rod of piston, crank shaft and cams in car engines, cutting tools and dies forming. The metallurgical basics of nitrocarborizing are applied to control the process and determination of the formed layer (white dispersion layer) by nitrogen dispersion in steel. Due to typical nitrocarburizing proc­ esses Oxycad NT® - used nitriding and carburizing suitable gases, at tem­ peratures between 530 to 750 °C - to create a compound and a underneath lying diffusion layer (Fig. 1). Fundamentals of nitrocarburizing Nitrocarburizing is a thermo ­chemical heat treatment process which leads to Nitrocarburizing, by definition, is a thermochemical treatment that is applied to a ferrous object in order to produce surface enrichment in nitrogen and carbon which in turn form a compound layer. The composition, function and control of the furnace atmosphere are of crucial importance for the result of all hardening and thermochemical operations. nitrocarburizing. Therein the workload is negatively biased relative to the grounded reactor walls. At a few mbar of pressure, a pulsed dc glow discharge is maintained, producing reactive species from the feed gas of H 2,N 2, and carbon- containing species. The plasma heats the workload to a temperature between 673 and 823K, thus enabling diffusion DYNA-BLUE Ferritic Nitrocarburizing meets or exceeds the following specifications: AMS 2757B GM TPH-AA001, 24216886 Chrysler PS-4TN Ford Spec for Nitrocarburizing Meritor Spec 343-B The process was repeated(24 hours of salt followed by 24 hours at room temperature). DYNAMIC SURFACE TECHNOLOGIES . 3262 1045 This article summarizes the terminology for gas reactions, and discusses low-temperature nitriding and nitrocarburizing of stainless steels. It describes the various nitriding processes, namely, high- and low-pressure nitriding, oxynitriding, sulfonitriding, oxysulfonitriding, ferritic nitrocarburizing and austenitic nitrocarburizing. Nitrocarburizing is a variation of the nitriding process. It is a thermochemical diffusion process where nitrogen, carbon, and to a very small degree, oxygen atoms diffuse into the surface of the steel part, forming a compound layer at the surface, and a diffusion layer. Nitrocarburizing is a shallow case variation of the nitriding process. The process of saturation of steel with nitrogen and carbon accompanied by formation of pores includes a diffusion stage, which depends on the gradient of the concentration of nitrogen, on the composition of the steel, and on the temperature and time of nitrocarburizing [