During the production process, the sand pumping dredging pipe will have the problem of impurities due to a series of reactions. This is due to the chemical reaction with some substances during the production process, including endogenous inclusions and foreign inclusions, which will cause impurities. appear.
During the production process, the sand pumping dredging pipe will have the problem of impurities due to a series of reactions. This is due to the chemical reaction with some substances during the production process, including endogenous inclusions and foreign inclusions, which will cause impurities. When we find the source of the impurity, we can avoid it. Let’s analyze it below.
1. In the production process of the sand pumping dredging pipe, the inclusions are mainly used for deoxidizing and alloying operations. The deoxidizer (A1, FeSi, SiMn, etc.) added to the molten steel is oxidized to form Al2O3, SiO2 and MnOAl2O3, SiO2- MnO, Al2O3-SiO2-MnO and other composite deoxidation products; alloying elements (Cr, Ti, Si, Mn) are partially oxidized to form inclusions such as FeOCr2O3, SiO2-Cr2O3, Al2O3-Cr2O3, Cr2O3-MnS, TiO2, etc.; the molten steel is cooling and solidifying During the crystallization process, secondary deoxidation products will be formed due to temperature drop and local component segregation. When these products are too late to be discharged from the molten steel, they remain in the steel to form endogenous inclusions.
2. The foreign inclusions in the finished product of the sand pumping dredging pipe are large inclusions brought into the molten steel by the erosion and erosion of refractory materials during the smelting and casting process, and the slag mixed into the molten steel (such as the mixed steel slag in the AOD tapping process) And the secondary oxidation during the transportation and casting of molten steel.
3. Nitrides in the stainless steel liquid mainly appear in the form of TiN, which is [N] dissolved in steel, and the product of the action of N2 in the air inhaled by the liquid steel and [Ti] in the steel during the smelting and casting process . In addition, during the solidification of molten steel, other types of nitrides such as CrN and Cr2N will be produced.
The above are some sources of impurities that may appear in the production process of the sand dredging pipe. From the above introduction, we can see that the sources of impurities are diverse. This requires more attention during the production and processing, and the choice of raw materials Try to choose products with high purity so that we can do a good job of control from the source.