Improvement And Application Of Width Tolerance Control Technology In Hot Strip

Hot-rolled strip is widely used in the key areas,such as construction,automotive,petroleum,machinery and equipment,which are an important industrial material.It plays an important role in the national production and life.China is the largest crude steel production country in the world,which exceeds capacity seriously.The market competition is intense extremely.Trying hard to improve the quality of steel products hardly is a key factor in winning the competition for iron and steel enterprises.Width of hot-rolled strip is a very important parameter in dimension,which is one of the key indicators for hot-rolled fabrication.Therefore,carrying out systematic and in-depth research around hot strip width control problems,what has important application value.The paper is in the background of 2250mm hot-rolled mill and 1580mm hot-rolled mill of Shougang Jingtang United Iron&Steel Co.,Ltd.On the basis of reading lots of relevant literature,through analyzing width unusual problem deeply on the production site,I divided the problem into four categories according to the width unusual position.Those are the head zone,necking zone,the tail zone and the overall zone.The improvement achieved fine width control effectively,and improved the width quality level of the strip.Main achievements and innovations made in this article include:(1)The paper proposed improvements of strip head width control technology.This method has been applied to the Shougang Jingtang 2250mm hot rolling production line.The results of strip width deviation curve before and after improvement show that the method can solve narrow head of the strip effectively.(2)The paper proposed improvements of strip necking zone width control technology.This method has been applied to the Shougang Jingtang 1580mm hot rolling production line.The results of strip width deviation curve before and alter improvement show that the method can solve narrow necking zone of the strip effectively.(3)The paper proposed improvements of strip tail width control technology.One method has been applied to the Shougang Jingtang 2250mm hot rolling production line,the other method has been applied to the Shougang Jingtang 1580mm hot rolling production line.The results of data and strip width curve before and after improvement show that the method can solve narrow tail of the strip effectively.(4)The paper proposed improvements of strip whole width control technology.This method has been applied to the Shougang Jingtang 2250mm hot rolling production line.The results of strip width deviation curve before and after improvement show that the method can solve the whole of the strip out of tolerance effectively.