In the production process of hot strip rolling,the coiling temperature is one of the key process control indicators,and its control accuracy will directly affect the uniformity of the microstructure and the stability of mechanical properties of hot rolled strip coil.In order to solve the problem of low accuracy in controlling the coiling temperature hit rate of thick gauge strip,the heat transfer method after rolling,finishing rolling temperature control model,and production big data were organically combined and systematically analyzed.The results showed that the setting of threading speed and the control of ultra-fast cooling pressure under dry head mode were the main influ-encing factors for the coiling temperature deviation of thick gauge strip.Therefore,the method for collecting the inlet temperature of fin-ishing rolling was optimized to improve the accuracy of threading speed setting.At the same time,an ultra-fast cooling pressure control program was developed under dry head mode,which improved the accuracy of ultra-fast cooling flow control and thus improved the accu-racy of coiling temperature control.Through the above optimization measures,the coiling temperature hit rate of thick gauge(thicknees h＞13 mm)strip has been increased by 7.24％,achieving good results.
coiling temperaturethick gauge hot rolled stripinlet temperature of finishing rollingthreading speeddry head con-trol modepressure control of ultra-fast cooling
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