Research On Optimization Secondary Cooling System Of Ccsd36 Medium Plate Continuous Casting

During the producing process of slab casting, secondary cooling system is a very important technology which relates to trouble-free opration in pouring process and slab quality. Productive operation indicate that almost the familiar slab quality defects have relation to secondary cooling system. As for the most continuous casting producers, how to design a rational secondary cooling system has become a focal problem. In this paper, the problem of surface cracks in continuous casting slab of ship steel at Tangshan medium plate company was analyzed, for the purpose of realizating highly quality and active of slab production, The secondary cooling system was optimized and the corresponding optimization result was put forward finally.Based on the thorough research of slab continuous casting and caster structures, beginning with ultimate heat transfer system, a heat transfer mathematical simulation model of slab continuous casting is established. By means of object-oriented programming language Visual Basic 6.0, all-purpose computer software of secondary cooling in slab continuous casting is developed. The software is more commonality. All kinds of boundary condition is investigated and the calculation condition is more approximate to production condition; The software is powerful and integrates data calculation and result processing as a whole. It mainly consists of continuous casting solidification process calculation, iterative and reverse calculation for the water flow of secondary cooling zones, regression formula of the flow capacity and graphic processing; The interface of the software is friendly, and the data input and modification are convenient, calculating time is short.Using the Gleeble-1500 thermal simulation testing machine, the high-temperature mechanical properties of CCSD36 ship steel was tested. Meanwhile studied the effect on plastic made by deformation temperature, deformation rate and cooling rate. This research shows The well-plastic temperature area is between 1300～900℃, and the RA% is up of 80%. No sencond brittle zone, the third brittle zone of CCSD36 is between 850～720℃.The research offered reference for the optimum target temperature in each section of secondary cooling zone.Model based on slab life is established. The slab is divided into many slices which are tracked. The water flow rate is determined mainly by the residence time of the slices. Using virtual casting speed as control parameter could avoid the problem brought by traditional water control method which always made the water amount rapidly change due to the fluctuation of casting speed and then lead to severe temperature change on plate surface.For improving the plate quality and the production capacity and designing secondary cooling water-distributing for developing new steel grade, this research would offer significant theoretical supports and make outstanding contributions in the perfecting and developing of secondary cooling design.