Non-reactive casting powder for fluoride-free high-aluminum steel continuous casting crystallizer

Abstract

The invention discloses non-reactive casting powder for a fluoride-free high-aluminum steel continuous casting crystallizer, and belongs to the technical field of metallurgical engineering. The fluoride-free high-aluminum steel continuous casting crystallizer non-reactive casting powder comprises the following components in percentage by mass: 20 to 35 percent of CaO, 15 to 35 percent of Al2O3, 1 to 10 percent of SiO2, 7 to 15 percent of BaO, 7 to 15 percent of B2O3, 10 to 17 percent of Na2O + Li2O, 2 to 10 percent of C, 1 to 7 percent of MnO, 1 to 7 percent of MgO and the balance of inevitable impurities. Compared with the traditional casting powder, the casting powder disclosed by the invention is not added with CaF2, so that the problem of large fluctuation of components caused by components in the aluminum reduction casting powder in the continuous casting process of high-aluminum steel, especially the performance of the casting powder, and the pollution to air, the harm to human bodies and the damage to continuous casting equipment caused by volatilization of F-containing gas in the continuous casting process are avoided.

Description

technical field [0001] The invention relates to a non-reactive mold slag for a fluorine-free high-alumina steel continuous casting crystallizer, and belongs to the technical field of metallurgical engineering. Background technique [0002] The aluminum content in high-aluminum steel is much higher than that of conventional steels using aluminum as a deoxidizer (Al>0.6%). During continuous casting, aluminum in molten steel tends to react with other oxides in molten steel, such as with SiO 2 reaction, making the SiO in the mold flux 2 content decreased, Al 2 o 3 The content increases, thereby changing the composition of the mold flux and destroying the performance of the mold flux. These include an increase in viscosity and melting point, and a decrease in lubricating properties. In severe cases, accidents such as steel leakage can also be caused. In order to avoid the above situation, it is necessary to study the special mold flux for continuous casting of high alumi...

AI Technical Summary

Problems solved by technology

[0012] The object of the present invention is: aiming at the high aluminum steel continuous casting crystallizer mold slag in the aluminum reduction slag in the continuous casting process SiO 2 The drastic change in the slag composition caused by the drastic change in the performance of the slag, and the pollution of the atmosphere by the fluoride gas in the mold slag, provides a non-reactive mold slag for fluorine-free high-alumina steel continuous casting molds, and abandons the use of CaF 2 As the main co-solvent idea, a method of adding B 2 o 3 , BaO and other components lower the melting point of mold slag to avoid air pollution caused by F volatilization during continuous casting