In recent years, the development of cold-rolled strip steel production technology is to increase the coil weight, speed up line speed, improve product thickness accuracy, improved flatness, increased automation and improved mill structure and production processes.

    1) Coil weight increase. Coil weight increase is an effective way of improving equipment production capacity, because the production of cold-rolled strip is coil mode, each coil in the unit to the inside before rolling or process, must go through Bale, unwinding, wear band, then accelerate to normal speed work in the end of time and the need for each volume reduction, cropping, reeling and unloading process, take up more production time. After Coil weight increases, the time can be a corresponding increase in jobs, but also due to the increased length of each volume of the strip, the strip rolling at a steady speed of time will also increase the speed of the unit can really be improved, strip quality can be improved. However, coil weight can not be increased indefinitely, it is limited by the structure and strength of the unwinding machines, coiling machines and other machinery and equipment, motor speed range is restricted, but the volume is too heavy steel will give the workshop transport and storage volumes difficult. At present, the weight of cold-rolled coil has reached 40 tons, the individual reached 60 tons, the volume for the strip width calculation unit weight of 30 kg / mm to 36 kg / mm.

    2) to improve unit and the mill speed. In five-stand rolling mill, for example, most of the fifties about 20 m / sec, since the sixties has been gradually increased to about 30 m / s, the maximum rolling speed of 37.5 m / sec. Maximum speed of six stand tandem cold rolling mill has exceeded 40 m / sec. However, to further improve the rolling speed limit will be lubricating materials and methods of the process. Other operating line (such as a flat single rack unit, two-rack-formed unit, each cutting unit, continuous hot dip galvanizing line, pickling, tin plating units, etc.) are also a corresponding increase in line speed.

    3) To improve the accuracy of the thickness of cold-rolled strip, cold-rolling mill in the hydraulic pressure using all means in order to increase the reaction rate of the AGC device, and uses automatic strip thickness control devices. For high-speed, high-volume steel cold rolling mill, to achieve a computer-controlled.

    4) On a cold strip mill, extensive use of hydraulic bending systems to improve the plate.

    5) automation in production operations, widely used in various forms of limit switches, photoelectric tubes, etc., the implementation of automatic process control for each action. Achieve a coil of the strip edge correction, the unit automatically adjusts the speed of the strip, cut steel automatic classification of automation and control.

    6) Since 1971, there has been a full continuous cold rolling mill. This mill feed as long as the first lead after threading, you can achieve continuous rolling. In this case, the follow-up with the volume of the head by welding machine welded to the rear before the tape roll. In order to be able to ensure a continuous strip rolling mill at the inlet end of the looper device settings. At the outlet end of the cold rolling unit set Clipper sub-volume use, and set up two coiler for coiling the strip alternately. Full continuous cold rolling mill roll change even when the strip is still stuck in the mill. Roll change over, the mill can be rolled immediately. A fully continuous cold rolling mill, can improve productivity 30 to 50 percent, product quality and yield also improved.

    7) the adoption of new technology, new equipment, such as deep drawing steel continuous annealing line and shallow grooves hydrochloric acid, HC and asynchronous rolling mill, in order to simplify the process of cold-rolled, cold-rolled strip to improve accuracy and save energy.