Decarburization during the production of steel pipes will affect subsequent processes and reduce the pipe’s inherent performance and service life. Therefore, manufacturers typically take appropriate measures to avoid or resolve this problem.

Generally, there are two ways to prevent decarburization.
(1) The most common and simplest method is to use the protective properties of nitrogen to maintain the pressure inside the furnace. Production workers can add or inject neutral nitrogen into the furnace according to a specific ratio. This not only prevents external impurities that decompose into oxygen and water vapor from entering, but also effectively disperses existing oxidizing gases in the furnace. Without the reaction medium with the carbon elements on the surface, decarburization will not occur, and the area of ​​decarburized areas will be reduced. (2) Control the carbon dioxide content in the furnace according to the equilibrium point of the workpiece. According to expert research, if the equilibrium point in the furnace is higher than the content of carbon dioxide and other oxidizing gases, then decarburization and oxidation will not occur. If the carbon dioxide content is equal to the equilibrium point, a neutral result will be shown; that is, neither decarburization nor oxidation will occur. The last result is also the main cause of decarburization, that is, the content of oxidizing gases in the furnace is higher than the equilibrium point. Therefore, in order to avoid the occurrence of decarburization, it is necessary to calculate the equilibrium point based on the internal temperature and carbon content of the workpiece, and then control the content of oxidizing gases in the furnace.