How to prevent decarburization of thick wall spiral steel custom pipeline

　　The service life of the spiral steel custom pipeline is positively related to the decarburization of the surface of the spiral steel custom pipeline. If the surface decarburization, the strength and wear resistance of the spiral steel custom pipeline will be reduced, which will directly affect the service life of the spiral steel custom pipeline. If the decarburization layer on the spiral steel custom pipeline is not cleaned, the hardness and wear resistance of the surface layer of the ASTM A252 SSAW Spiral Steel Custom Pipeline will be correspondingly reduced, and in the process of quenching, cracks will be formed on the surface of the workpiece due to the volume change of the inner and outer layers.

　　If you want to deal with the decarburization of the surface, you should mainly deal with the heat treatment process, because decarburization and oxidation of the spiral steel custom pipeline are carried out at the same time. Therefore, in the process of heat treatment, you should not let the spiral steel custom pipeline contact with the air, so you may as well improve the decarburization phenomenon.

　　The main medium for decarburization on the surface of the spiral steel custom pipeline is oxidizing gases such as oxygen, water vapor and carbon dioxide. When these gases contact with the heated spiral steel custom pipeline, they will form the oxidation and decarburization of the spiral steel custom pipeline. Therefore, the proportion of carbon dioxide and carbon monoxide in the pipe furnace is also important.

　　Originally, it was very useful to add protective gas nitrogen into the forging furnace of spiral steel custom pipeline. Nitrogen might as well remove some oxidizing gases to reduce decarburization of spiral steel custom pipeline.