The service life of thick-walled steel pipes is related to the surface decarburization of precision tubes. If the surface is decarburized, the strength and wear resistance of the spiral tube will be reduced, which will directly affect the service life of the spiral tube. If the decarburized layer on the spiral tube is not cleaned, the surface hardness and wear resistance of the spiral tube will be reduced accordingly, and during the quenching process, the change in the volume of the inner and outer layers will cause cracks to form on the surface of the workpiece.

To solve the problem of surface decarburization, it is mainly necessary to deal with the heat treatment process. Because decarburization and oxidation of the spiral tube are carried out at the same time, during the heat treatment process, the thick-walled steel pipe should be kept away from air as much as possible, which can improve the decarburization phenomenon. The media that cause decarburization on the surface of thick-walled steel pipes are mainly oxidizing gases such as oxygen, water vapor and carbon dioxide. When these gases come into contact with the heated spiral tube, they will cause oxidation and decarburization of the spiral tube. Therefore, it is also very important to control the ratio of carbon dioxide and carbon monoxide in the furnace. In fact, adding protective gas nitrogen into the thick-walled steel pipe forging furnace is also very effective. Nitrogen can disperse certain oxidizing gases and reduce the decarburization of the spiral tube.

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