The ESP technology is an improved process based on the traditional hot rolling process,which has higher working efficiency,cost advantage and product competitiveness.In the process of continuous casting,molten steel has complex thermal mechanical behavior in the mold.Precisely controlling the flow,mass transfer,solidification,force and solute redistribution of molten steel in the mold is the key to ensure the quality of the casting billet.This paper introduces the research background of ESP technology,and expounds its technological advantages and domestic development status.On this basis,the change of temperature field in continuous casting mold,the role of protective slag and the change of temperature field during rolling are analyzed,which provides a theoretical reference for optimizing ESP process.Based on the in-depth analysis of ESP process optimization design,the problems of fast roll wear and difficult mass production of special steel grades caused by high drawing speed in the production line were put forward,the process parameters of on-line roll change,one-to-one design of production line and chemical composition of design protection slag were proposed,and the feasibility of"replacing cold with hot"was analyzed in combination with ESP process characteristics and China's cold rolling market.It is believed that the"hot instead of cold"of sheet steel in China has a broad development prospect,but there are few"hot instead of cold"hot rolled plates developed and produced at present,and further exploration is still needed.Although the ESP process has been able to produce ultra-thin specifications of hot rolled strip steel(<1.0 mm),it has not been able to achieve mass production,for the same chemical composition of steel,different casting processes will have great differences in microstructure and mechanical properties.At present,a complete theoretical system has not been established for the effect of ESP process on the internal structure transformation of sheet metal,and the effect of the internal structure transformation of steel and alloying element diffusion will be the focus of future ESP process research.
ESPcrystallizerprotective slagreplace cold with heatorganizational transformationalloying element
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