High-Performance Hot Strip Mill - Introduction of Technologies Applied to the New No. 2 Hot Strip Mill at USIMINAS Cubatao

摘要

In addition to conventional steel grades, the production of special steels such as line pipe steel, DP, TRIP, HSLA, IF, and electrical steel is increasing. With more of these special steel grades being produced, the range of the target strip crown becomes wider. The target strip crowns for cold rolled steels tend to be larger, while the target strip crowns for electrical steels tend to be smaller. In recent hot rolling mills, the requirements for greater strip crown control capability are becoming more demanding. Rolling speeds are becoming higher to increase productivity and reduce temperature losses. At the same time, higher reduction rolling of high strength steel requires larger rolling forces. It is known that higher rolling speed, larger rolling forces, and higher reduction in thickness amplify mill vibration. Large mill vibration not only causes reduced life time of the mechanical parts, but also reduces the operational stability and productivity of the mill. In order to offer solutions for those drawbacks, Mitsubishi-Hitachi Metals Machinery, Inc. (MH) has developed a mill stabilizing device.