Effective measures to prevent secondary oxidation of molten steel with large diameter seamless pipes
To prevent secondary oxidation of molten steel, it is mainly to control the secondary oxidation of molten steel by slag; to control the atmosphere to prevent secondary oxidation of molten steel; to control the secondary tempering of molten steel by refractory materials.
Controlling the secondary weighting of the hydrophobic water is to prevent the inclusion of inclusions in the steel due to the reaction of dissolved oxygen and the degrading agent when the furnace method with polarization properties is in contact with the molten steel solution. . In order to achieve this, it is necessary to prevent the slag from being rolled into the ladle. The most common method is to use the file stack for the converter; the electric furnace adopts the eccentric bottom for tapping; or the crucible method can be used to prevent the liquid in the ladle from secondary to the molten steel. Oxidation.
In order to prevent the atmosphere from re-leveling the molten steel in the ladle, in addition to controlling the stirring strength of the gas to avoid contact between the molten steel and the atmosphere, it is necessary to ensure the tightness and reducing atmosphere of the ladle.
In order to control the secondary oxidation of the molten steel by the refractory material, the refractory material has a high quality. For example, a refractory material such as low silica or high tertiary aluminum is used. For the ladle of the dolomite and the MgO-C release line, the magnesium will diffuse into the steel due to the erosion of the molten steel, and it is possible to form spinel or CeO-AI2O3-MgO inclusions in the molten steel. The tundish m go clear line may react with the molten steel. It becomes a bridging of secondary oxide inclusions.
Use aluminum carbon refractories. The molten steel will undergo a complex reaction at the stone carbon deposit; the impurities in the reduced refractory material will form CO. The first layer of inclusions will be formed by the reduction of CO by the molten steel, and the reaction can be limited by the decarburization enthalpy.
The use of ladle tipping technology and inter-stand metallurgy technology can reduce non-metallic inclusions in steel.
All ladle refining furnaces have the function of removing non-metallic inclusions. Its main function is to reduce the secondary oxidation of molten steel by degassing, and there is enough time in the refining process to float non-metallic inclusions in the molten steel into the slag.
Tundish has begun to evolve from a single diverter to a multi-purpose container associated with slab quality control.