Physical And Chemical Properties Of304Stainless Steel Continuous Casting Crystallizer Protection Slag

According to the304stainless steel continuous casting billet surface pits,often appearoscillation mark and transverse crack surface quality problems. Investigate the applicationof mold fluxes for stainless steel based on the analysis on the solidification behavior of304stainless steel, and determine the key is to improve the crystallization temperature of moldslag so that can improve the heat transfer. And it can increase slag consumption to improveboth the lubrication.It can obtain that the slag component work on the properties of thephysical laws based on the work, providing a theoretical basis for the research anddevelopment of304stainless steel continuous casting crystallizer protection slag.The slag system selection is based on CaO-SiO2-Al2O3system in this paper. It alsoadds a variety of useful residue solvent and mixed into MnO,Li2O and other specialcomponents. The experiment tests the slag viscosity, melting temperature, melting rate,crystallization temperature properties by The MTLQ-RD-1300hemisphere melting pointand melting speed measurement system, the RTW-10type property comprehensive testerof melt, the German NETZSCHSTA449C DSC differential scanning calorimeter.Thispaper used the orthogonal test method and studied304stainless steel slag MnO, Na2O,Li2O and R content on the influence of physicochemical properties, and the conclusions ofthis dissertation are as follows:In the slag system, the influence on melting temperature, viscosity and crystallizationtemperature is: R>Li2O>Na2O>MnO and on the protection of slag melting speed effectsize is: Na2O>Li2O>R>MnO.When the MnO content is respectively2~5.3%, it can effectively reduce the meltingtemperature, viscosity and crystallization temperature,in order to improve poor lubricationdue to high basicity. When the mass fraction of MnO is greater than5.3%, the meltingtemperature, the crystallization temperature increases, and the melting speed slow,theviscosity reduces.When the Na2O content is respectively6~8%, with the increase of Na2Ocontent, it can reduce the melting temperature, viscosity and crystallization temperature. The mass fraction of Na2O should be controlled below8%, so it can avoid the precipitationof high temperature nepheline, deterioration of lubrication conditions.When the Li2Ocontent is respectively0.5~2.5%, it can obtain a low melting temperature, low viscosity,strong slag glass. The average increase in Li2O experimental melting temperature1%isreduced by an average of24℃, viscosity is reduced by an average of0.035Pa s, when themass fraction of Li2O is greater than2.5%, the crystallization temperature increases rapidlydeteriorates slag glass properties.When the basicity content is respectively1.0~1.2, with increasing basicity, it cansignificantly reduce the melting temperature and viscosity, melting speed, thecrystallization temperature increases. When basicity is greater than1.2, the meltingtemperature and the viscosity began to increase slowly, the melting speed slows,crystallization temperature continues to increase. So the basicity should be controlled in1.2is appropriate. It can not only improve the temperature of crystallization key toimprove heat transfer, but also can reduce the slag melting point and viscosity to improvelubrication.