OCTG casing and tubing is a kind of popular steel pipe in the steel industry,But now there is decarburization phenomenon for the OCTG tubing and casing. What can we do to avoid decarburization for them?
Generally, there are two methods to avoid decarburization for OCTG casing and tubing. One is the common and not complicated way: Make full use of nitrogen protection to maintain the pressure inside the furnace .According to the proportion, the workers can join or into neutral nitrogen furnace, which not only can prevent outside air into oxygen and water vapor to pieces, also effectively dispersed gas exists in the oxidation furnace. No carbon on the surface of the reaction medium, the area of the decarburization can also reduce decarburization will not occur.
Another method is the balance of co2 concentration control furnace according to the oil well tubing and casing artifacts. Experts research,If carbon dioxide is equal to the balance of the results will show neuter no decarburization and oxidation; if the balance is higher than the content of the carbon dioxide and other gases, there will be no decarburization and oxidation phenomenon; The end result is the main cause of decarburization, this oxidation furnace gas content is higher than the balance. So, if you want to avoid the decarburization phenomenon, it is necessary to calculate the balance according to the internal temperature and carbon content of workpiece, and then control the oxidizing gas content in the furnace.