RESEARCH ON ROLLING STABILITY OF HOT ROLLED HIGH STRENGTH THIN PICKLED PLATE
Due to its complex composition,high strength,and thin specifications,hot-rolled high-strength thin pickled plates have poor stability during the rolling process,and are prone to phenomena such as head breakage,strip deviation,and tail shaking,which can lead to significant roll mark degradation on the surface of the strip and even steel stacking accidents,resulting in economic losses.To ensure stability,the method of increasing the tapping temperature is usually adopted,but it may lead to an increase in the degradation rate of surface oxide scale defects.Based on this,the head and tail control program was optimized,with special control of the precision rolling descaling head.In the double row mode,a single descaling was used for the strip head,and after Fl biting the steel,the double row mode was activated to improve the stability of the head threading process.It has developed the F7 rack tail AGC secondary lifting function,which lifts the F7 AGC at a speed of 4.6 mm/s after F6 steel throwing,reducing the tail rolling force,and controlling the distance of the tail thickness exceeding 60 μm within 8 m.The timing sequence of water descaling between Fl and F2 stands was studied.The water between F1～F2 stands was gradually put into use,giving way to the leading and trailing parts.The use of water between stands increased the precision rolling speed by 1～3 m/s,reduced the temperature drop at the tail,and improved the rolling stability at the tail.Reduce the load by 5％when using rolling oil.Optimizing the load distribution of the rolling mill,the F2 reduction rate is less than 50％,significantly improving the phenomenon of roll peeling,and reducing the incidence of iron oxide scale in the roll system from 0.28％to 0.25％.By optimizing the parameters of each section of the production process,the rolling stability and surface quality of hot-rolled high-strength thin specification pickled plates have been improved.
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维普
