Cold rolled wear-resistant plate with pickling method
Cold rolling wear-resistant plate with pickling and cold continuous rolling
When the output of cold-rolled wear-resistant plate strip production is more than 1 million tons/year, priority should be given to modern cold tandem rolling units with large-scale, continuous, automated and high-speed characteristics, and the reversible rolling method of multiple single stands or double stands should be avoided as far as possible to improve production efficiency.
The multi-frame continuous rolling is divided into four kinds: conventional single-coil continuous rolling wear-resistant plate, full continuous headless rolling wear-resistant plate, pickle-cold continuous rolling combined wear-resistant plate and pickle-cold continuous rolling combined with continuous annealing wear-resistant plate.
The conventional single-coil continuous rolling of wear-resistant plate is a kind of continuous rolling form in an earlier period. Because each wear-resistant plate steel coil must go through the process of belt wearing, acceleration and tail spinning, the control accuracy of strip thickness and plate shape is limited, and the roll surface is easily damaged when strip steel tail spinning, and the production capacity is limited due to slow production rhythm.
Full continuous rolling wear-resistant plate is added in front of the mill welding machine and looping, in the steel coil into the mill before the steel coil welding, the buffer function of the loop makes the strip steel continuously into the mill for continuous rolling, under normal circumstances are adopted full continuous headless rolling, a strip can be continuously rolled down, the mill only need to slow down when the strip through the weld and the coil. Obviously, the length of the thickness of the lead and the tail is shorter than that of the conventional continuous rolling, generally not more than 20m. The conventional single-coil continuous rolling method can also be used for a few thicker strips and hard strips.
The pickling and cold continuous rolling combined wear-resistant plate rolling method developed in the early 1980s shows the advantages of high continuity, automation and high-speed. The combination method of pickling and cold tandem rolling saves the middle library between pickling and rolling mill, and also saves some equipment between the two processes such as welding machine, coiling and uncoiling, oiling and so on. It occupies less land, saves investment, and has high metal recovery rate, so it is more and more widely used. Pickling - cold continuous rolling _ continuous annealing joint production is a highly joint production mode, the coordination between the unit and the unit is very important, the reliability of the operation of each process, the speed matching before and after each process, the level of automation control and other requirements are higher, especially the joint production of cold continuous rolling and continuous annealing is more difficult. If one of the links fails, the whole line will be shut down. Therefore, most of the new and reformed cold tandem rolling production lines are pickling and cold tandem rolling combined production lines.
