0.35% C). This carburizing process will increase the carbon content in the surface layer of steel about 0.75 - 1.20%. The main purpose of this project is experimental study of pack carburizing of carbon steels by using two parameters (holding time and carburizing temperature). Unless the furnace can entirely seal off oxygen, it can not carry out the desired process. Nitreg ® is a modern heat treating process, capable of meeting the metallurgical requirements of all nitriding specifications that may have been originally written for salt bath, plasma or traditional gas nitriding. There are two forms of nitrocarburizing: austenitic and ferritic. The carburizing temperature varies from 870 to 940 °C the gas atmosphere for carburizing is pro-duced from liquid or gaseous hydrocarbons such as propane, butane or methane3. and carburizing temperature.the process of carburization, carburizing temperature and soaking time at. The heating process will last for 12 to 72 hours at a high temperature. The following furnace concepts are suitable for curing, carburizing and nitriding: Hardening Hardening in the protective gas box/protective gas annealing bag or annealing box in chamber furnaces with or … Generally, carburizing carried out in the temperature range 900-950 degree Celsius, and surface layer enriched with with carbon. There are five carburizing methods—pack, gas, liquid bath, vacuum, and plasma. Liquid carburizing was carried out in liquid medium by using cyanide baths that have sodium cyanide content (NaCN) of 10% for 8hr and temperature 925ºC as it is shown in Table .2 . This study was conducted by using furnace. at carburizing temperature. US Patent References: ... Another process which is used is liquid carburizing in which the steel or iron is placed in a molten salt bath that contains chemicals such as barium cyanide and the like required to produce a chafe comparable with one resulting from pack carburizing. Work pieces are heated with carbon carrying gas. Carburizing process media to increase surface hardness and metal wear resistance. Carburizing depth mainly depends on holding time, generally according to 0.2-0.25 mm per hour estimation. In this case, the process will be carbonitriding process since nitrogen will also be penetration diffused along with the carbon at the same time. All carburizing steel grades, carbon and/or alloy, may be liquid carburized with case depths of 0.005" to 0.250". Likewise, it is important to protect tools from de-carburization (the loss of carbon from the steel’s surface) during the heat treating cycle. The components are held in a molten salt that introduces carbon into the steel. 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