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Controlled atmosphere heat treatment furnaces
Controlled atmosphere heat treatment furnaces.
1), at least non-oxidation heat treatment technology development trend, the most important development controlled atmosphere and vacuum heat treatment rapidly. In the present less variety, mass production, especially carbon steel bright quenching and general alloy structural steel members, annealing, carburizing, carbonitriding quenching gas nitrocarburizing still controlled atmosphere as the main application means. So controlled atmosphere heat treatment is still a major part of advanced heat treatment technology.
2) to prepare the atmosphere gas source. Our controlled atmosphere in mastering and promotion process, in an atmosphere of problem solving has come a long way. The first endothermic atmosphere furnace is mainly used liquefied petroleum gas, namely high purity propane or butane. In recent years it has confirmed that China has abundant natural gas resources, to prepare an endothermic type atmosphere with methane to create good conditions. Do not use raw furnace atmosphere directly - also a way can not be ignored.
3), heating equipment. Sealing high degree of automation and multi-purpose furnace multi-purpose furnace production line, the production of flexible large, applicability, and thus wide application
4), controlled atmosphere heat treatment process. Carburizing. Carburizing carburizing temperature is one of the technology trends. Improve the carburizing temperature can significantly improve productivity and save energy. Electric radiant tube material can be used to do this research and development is a priority above 1000 ¡æ, low pressure carburizing technology development and improvement to achieve a high temperature carburizing (1040 ¡æ) to create the conditions. Steel case depth requirements are generally more conservative, sometimes very blind. It seems necessary to study the factors that determine the mechanical case depth, and to explore the possibility of reducing the nitrided layer requirements. Carbonitriding. Carbonitriding lower temperature than carburizing, the workpiece distortion is small. In the case depth of 0.6mm or less the penetration rate is close to 930 ¡æ carburizing. Prone when abnormal tissue carbonitriding steel, the surface hardness after quenching phenomenon has decreased, the diffusion layer has more residual austenite.
How to choose the process, give full play to the potential of carbonitriding still worth exploring. It has been promoted in the past excessive concentration carbonitriding, we have had time Carbonitriding steel surface carbon content of 0.6%, with the best mechanical properties of the report, for which different opinions. It seems necessary to grasp these laws, the production process is preferably help. Rolling past and now have to in order to improve the implementation of the carbonitriding contact fatigue strength reported. For example AISI52100 (equivalent to GCr15) steel balls and rollers past by quenching and tempering carbonitriding to destroy life quenching, tempering, bearing increased 2.42-fold. It seems to realize the full potential carbonitriding process there is much work to be done.


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