Physical Simulation Study On Optimization Of Process Parameters In Continuous Casting Of High Quality Steel

As the demand for high-quality steel grades increases,each process parameter in the continuous casting process must be precisely controlled in terms of precise design.The research adopts the research method of physical simulation and direct test and analysis on the production site.The billet continuous casting of high-quality steel grades in a steel plant is a tundish baking process to ensure the life of tundish refractory materials,tundish and molten steel thermal stability.Parameters;in order to prevent the secondary oxidation of molten steel in the tundish by argon blowing before casting in the tundish process parameters;the reasonable crystallizer nozzle structure size and corresponding process parameters that affect the temperature and flow fields of the crystallizer are analyzed and optimized.This is The realization of the basic work of intelligent manufacturing is of great significance for controlling the quality of the slab.The test and analysis of the highest temperature,temperature difference of each layer,temperature uniformity,and heating rate of the refractory material during the baking of the tundish show that under the current baking process parameters,the temperature of the working layer of the tundish before casting can reach 1000 ?requirements;the thermocouples in each position reflect similar heating rates in various stages,indicating that the roaster is arranged reasonably;the two test points present similar temperature curves,indicating that the temperature distribution during the baking process is uniform;the two test curves at the same point overlap,It shows that the baking process parameter control is stable;the heating rate gradually decreases with increasing temperature.Through field test and physical simulation,the location,time,flow rate of the argon blowing before casting in the tundish and the characteristics of the change in oxygen concentration in the tundish are evaluated and analyzed.Quickly drop to <0.5%target requirement within 3min;experiments show that increasing the argon blowing point from 5 to 7,while using continuous flow argon blowing mode with large flow rate and small flow rate,can achieve the target of oxygen concentration control in the tundish before casting Claim.Through physical simulation experiments,the structure size and corresponding process parameters of the crystallizer nozzle with a cross section of 320 × 420 are designed and researched.The nozzles conforming to the pulling speed range of this section are the double-side hole 1 # and four-side hole 3 #.These two types of nozzles can meet the control requirements of the flow field for liquid surface fluctuation,liquid slag coverage,impact depth,and 50?m inclusion floating rate control.From the perspective of the flow field,the electromagnetic stirring parameters matching the 1 #and 3 # nozzles are 2Hz and 420A;when the pulling speed is 0.6m / min,the insertion depth of the 1 # nozzle is 200-220 mm,and the optimal insertion depth is 210 mm.The insertion depth of the 3 # nozzle is 180-200 mm,and the optimal insertion depth is 190 mm.