Technology Study And Application Of Shougang High-grade Steel Plate Shape Control

Shougang quality plate capacity is increasing consistently in recent years,including high strength steel,bridge steel pipeline steel with TMCP delivery condition.Due to its strict rolling technology,plate shape quality becomes the main factor of restricting the quality steel production,meanwhile,Shougang 4300 mm thick plate production line has a certain gap with the high level industry enterprises in plate shape control methods,urgently expecting breakthrough in the plate shape control.With the optimization of 4300 mm rolling mill ‘s roll system adjustment,the roll model development of the big crown backup roll with different crown of work roll has been achieved,in the absence of CVC roll function,plate crown control ability has been expanded,fit for the demands of different dimension plate shape control,at the same time according to Shougang 4300 mm thick plate production line,a "pass copy" and "speed optimization",etc characterized as Shougang 4300 mm thick plate production line's unique shape control interface has been developed,which is more convenient for the operation.In the absence of flatness gauge of the plate shape control means shape control method of the plate based on the strategy of plate crown has been developed and the application effect is good.In cooling,the plate quality after ACC cooling is improved obviously by adopting the "micro-wave control method".At the same time,with the volume change analysis in view of the low carbon bainite steel plate,put forward when the final cooling temperature above 550 degrees steel plate heat bilges cold shrink plays a leading role,when the final cooling temperature is at 550 degrees,the phase change plays a leading role,and based on the regulation of water ratio,flatness improvement effect is good.In straightening,depending on years of exploration concerning great influence of the temperature changes on the production of thin steel plate shape in winter,propose straightening strategy based on seasonal change,especially thin steel plate shape control effect is remarkable.In terms of improvement of rolling,water-cooling,straightening and other key process,quality plate shape control with TMCP delivery in Shougang 4300 mm thick plate production line has achieved good effect,greatly upgrading the market competitiveness of Shougang in steel plate market,with greater contribution for "preferred plate”,"China Dillinger" branding...