Cause analysis and control of elliptic coil defects of hot rolled strip
Aiming at the problem of elliptic coil defects in 2 250 mm hot rolling production line in a factory,the causes of elliptic coil defects were analyzed and effective control measures were put forward based on the equipment status and production practice.The results show that the main causes of elliptic coil defects of hot rolled strip are bad shape or cross section of the strip,unrea-sonable coil shape process control and coiling temperature control.By optimizing strip shape and cross section control,optimizing strip head tracking,improving coiling tension,adopting wrapper roll pressure control,optimizing wrapper roll pressure setting and mandrel expansion time,adjusting coiling temperature,optimizing the process of phase transformation and other control measures,the elliptical coil defects are effectively controlled,the coiling quality has been greatly improved,and the competitive-ness of products has been improved.
hot rolled stripelliptic coil defectstrip shapecoil shapecoiling temperature
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