Numerical Simulation On Heat Transformation Process Of CSP

The technology of compact strip production is a new techniques with compact process on hot strip rolling which received successful development in 1980's as well as is one of the most important revolutionary technology of steel industry, following making steel with BOF and continuing casting, This technology that finishing rolling hot strip with a short line integrated science, technology and engineering has became the hot topic on iron-steel industry. Sufficient fact has been showed scientific and advanced.All techniques of CSP used in our country originate from abroad. Process software (controlled on line and offline) is key component of the techniques. Learning, digestion and developing the CSP control system and management software, which have the intellectual asset, are the key step to promoting steel-maMng enterprise. And it is also a very important for developing CSP technology by self-reliant and optimizing management of production line. Therefore the digital model on heat transformation process of CSP is vitally component of this software.This paper aims at researching process of heat-transfonnation and running numerrical simulation. Heat-transformation process of continuing casting is mainly cooling process on slab's solidification. According to the style of online model, combined with situation of BTCSP line, taking account of many effective factors such as mould powder, heat-transformation coefficient in slab surface of secondary cooling zone and solidification rate model. Through data calculated, we build the differential math model of casting process and analyze partial operation and model data, which effect on slab surface temperature.We adopt heat source function to deal with potential heat during solidification and select solidification rate equation, which can reflect solute re-distribute in two different phases. We build a planar math model, which describe temperature change of slab section along rolling direction in any time through simplifying heat-transformation process model based on convective heat of planar movement. It analyzed and simulated data as well as the different operation through calculating, as result of gettingthe principle of three typical temperature points on the slab section and the temperature distribution of mould exit, secondary cooling zone and the free cooling zone. The results on data calculation indicates:(1) The model reflects the growing process, the length of liquid core and slab temperature for the heat transformation process completely during casting. This result that is really true has valuable for application.(2) Casting speed and flow of secondary cooling have influence on distribution of temperature in slab surface, shell thickness and liquid core length. But the steel temperature only effects on liquid core length.(3) Gap thickness and absorb coefficient of mould powder have much influence on shell thickness and slab surface. Therefore, it will benefit for casting peritectic steel through decreasing the gap thickness or increasing; absorb coefficient of mould powder. The model of solidification rate only influence on liquid core length, but not slab temperature.