Continuous Casting Process Of Bonding Alarm And Breakout Prediction System Research Model To Determine

With the development of modern continuous casting steel technology, the high efficiency continuous casting technology like high speed is widely used in iron and steel enterprises. However, with the application and promotion of high speed and high efficient continuous caster machines, the number of continuous caster’s steel breakout accident has increased dramatically. Continuous caster breakout accidents directly led to the decrease of the casting machine’s operation efficiency, the substantial increase of production cost and direct economic losses. More than60%-80%percent breakout accidents are sticker type steel breakout accidents. Thus the research on sticking breakout accidents has become an important subject of breakout accidents’study.In order to study sticker breakout accident in slab, the process and the force of sticker breakout were analyzed. The friction between the wall and solidified shell, the vibration of the mould and the strength strand shell effect sticker. Mechanics of inequality was established and the factor of sticker was found. When the strength of steel high temperature and solidification constant were larger; the solidified shell was harder to tear and the possibility of sticker was lower. When the liquid flux viscosity, mould’s vibration amplitude, mould’s vibration frequency and casting speed were larger, the solidified shell was easier to tear and the possibility of sticker was lower.By using the data of5444furnaces continuous casting’the research studied the effect of the content of carbon in molten steel, the Mn]/[S], the content of Copper, refining process and the degree of superheat on Bonding alarm. The result shows that when carbon content is between0.06-0.11%the number of sticker alarm rate is higher than the number of sticker alarm rate in other carbon content range. When the Mn]/[S] is lower than40the times of sticker alarm raised. high content of copper lead to high sticker alarm times. when the superheat temperature is below15℃, the sticker alarm times, and sticker alarm times rate increase.This research studied the breakout accident in the process of using breakout prediction system which was designed by Central Iron and Steel Research Institute. The cloud picture of70seconds before the breakout and the temperature curve of five minutes were analyzed in this study too. Through those analyses, the reason of the breakout was found. Decision model has been optimized. The new liquid steel surface low temperature model, the temperature inversion model, the logic judgment model, the temperature change rate of steel breakout alarm model, the sticker point of horizontal&vertical diffusion time steel breakout alarm model and the ratio of sticker point of horizontal&vertical diffusion rate and the casting speed breakout alarm model were all optimized.