Abstract
In the hot strip mill, the quality of the strip greatly depends on the cooling process between the last stand in the finishing mill and the coilers. Therefore, it is important to carefully control the coiling temperature to regulate the mechanical properties of the strip. To realize high accuracy of coiling temperature, a new coiling temperature control using temperature measurement method for the hot rolled strip in the water cooling banks has been developed. The features of the new coiling temperature control are as follows: (i) New feedforward control adjusts ON/OFF swiching of cooling headers according to the strip temperature measured in the water cooling banks. (ii) New feedforward control is achieved by dynamic control function. This coiling temperature control has been in operation successfully since 2008 at Kashima Steel Works and improved the accuracy of coiling temperature of high strength steel considerably.
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