Cyanidation of steel is also called “carbonitriding”. The initial cyanide is carried out with cyanide salt, so it is generally called ‘cyanation’. It is a chemical heat treatment process in which the surface of steel parts is saturated with carbon atoms and nitrogen atoms at the same time. Carbon with various carbon contents Steel or low carbon, medium carbon or high carbon alloy steel can be cyanated.
Because the thickness of the cyanide layer has little to do with the grade and chemical composition of the steel structure, the cyanide process is widely used in the machine industry, especially in the automobile manufacturing industry. Carbonitriding is actually carburizing in disguise, except that nitrogen atoms are added to the carburized layer. The advantages are:
(1) The hardenability is slightly higher than the carburizing hardness, and the wear resistance and fatigue strength are also high.
(2) The infiltration of nitrogen atoms reduces the existence temperature of the austenite phase, allowing carbonitriding to be carried out at a lower temperature (700-900 degrees).
(3) It is easy to quench directly and the workpiece is not easy to deform.
(4) The infiltration of nitrogen atoms will also increase the hardenability of the infiltration layer, and ordinary stainless steel can be used instead of alloy steel.
(5) The infiltration of nitrogen atoms can improve the stability of austenite, so using a medium with weak cooling capacity can reduce the deformation and cracking of the workpiece.
Link to this article：Cyanide and characteristics of steel
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