Design And Development Mold Flux Of High Carbon High Alloy Steel With Thin Slab Continuous Casting

The liquidus temperature of high carbon steel is lower. During high carbon steelsolidification formation of the shell is thinner than low carbon steel. The solidificationmicrostructure and microsegregation will impact on high temperature mechanicalproperties of steel. In High temperature conditions, the strength of high carbon steel isweaker than the low carbon steel. In the same molten steel static pressure, high carbonsteel billet outside expansion tendency large. The shell and the mold wall is easy toproduce bonding and increase the friction. The physical properties of thin slab continuouscasting mold flux is difference from the traditional continuous casting mold flux. Thinslab continuous casting high carbon steel mold flux should have low viscosity, lowmelting point, appropriate crystallization temperature, good glass tendency.On the basis of the existing thin slab continuous casting high carbon steel mold fluxselects basicity, Na2O, MgO, F-, BaO which have a greater influence on the physical andchemical properties of components. By Brookfield rotary viscometer, mold flux film heatflow simulator, SHTT-Ⅱ tester crystallization temperature, determination of thesecomponents influence on mold flux properties and mechanism of action. Experimentresearch of the components and the influence law. The optimization of existing mold fluxratio.The results showed that: With the increase of basicity, the slag viscosity and heatflow density are decrease. The crystallizing temperature is increase. With the increase ofNa2O content, the slag viscosity and heat flow density are decrease. The crystallizingtemperature is increase. When the Na2O content is too high the performance of mold fluxwill fluctuate. With the increase of MgO content, the slag viscosity is decrease,crystallizing temperature is increase.F-significantly reduces the slag viscosity, the heatflux density and the crystallization temperature. BaO decrease the viscosity andcrystallizing temperature. When BaO<6%, heat flux of slag film increase, when BaO>6%,heat flux of slag film decrease.