Study On Uniformity Controlling Of Profile Temperature Of The Strip After Laminar Cooling In Baosteel 2050 Hot Strip Mills

Laminar cooling of hot rolling plays an important role in the performance of the products.Baosteel hot rolling has no temperature uniformity change test equipment during rolling,In the laminar cooling process,there is no uniform temperature distribution control device in the width direction,It is impossible to carry out the research on the temperature uniformity in hot rolling process and the influence on the product performance There is no technological accumulation in this respect.In the system of product manufacture,the rolling temperature and coiling temperature in the middle part of the strip have been put forward only.On the other hand,five types of user objections for hot rolling are analyzed:1)The uniformity of lateral structure needs to be improved;2)Severe ear damage to the mold;3)The edge of strip is easy to crack when stamping;4)There are side waves at the edge,and severe transverse creases on the surface after the longitudinal shearing;5)Both sides of the wave cannot be straightened and need to be removed,their cause of formation can be traced back to the strip edge,closely related to uneven temperature in strip width direction.Therefore,it is urgent to solve the problem of cooling temperature uniformity of hot strip steel.In 2010,2050 hot strip completed cooling side temperature control device of the technical transformation,has a certain temperature uniformity of the laminar cooling control method.By this article,the control ability through the transformation of equipment,equipment control,research the variety and uniformity of temperature effect on the performance of the product of the cross section the temperature uniformity of the products are obviously improved,organizational differences significantly reduced,resulting in the improvement of product quality:the width of plate edge crack of cold rolling strip has been improved obviously;the edge shape of high strength steel of cold rolling strip has been improved.Thus,it effectively improves the quality and competitiveness of 2050mm line products.Based on the above research work,the following conclusions are drawn:(1)Confirm the temperature value of the most edge of strip by judging the trend of temperature change,and lay a foundation for further research.(2)Through the typical cold rolling,hot rolling varieties for cooling simulation experiments,including at different temperatures with different cooling rates were simulated,and the performance and sample microstructure simulation was analyzed.It was found that the lower cooling rate will produce different effects in different temperature,in principle,to avoid reducing the cooling phase transformation zone the rate of the edge,so can effectively improve the uniformity of microstructure,otherwise counterproductive;(3)In the 2050 current products,some of the varieties with sensitive border tissue have improved quality when they are covered by edges.