An acidless descaling process for cold rolled steel strip and manufacturing device thereof

Abstract

The invention relates to a method for removing scale of cold rolling strip steel without acid. Wherein, the strip steel on the release machine, via the drawing roller, is fed to the cutter to be cut head or cut end; it uses welder to weld the head and end; feeding it to the wide adjustable free sheath to be stored; feeding it to multi-roller tooth scale remover to break the ferric oxide on the surface of strip steel; the steel brusher removes the left scale skin; in the scale removing box, the high-pressure water flows with the wet sand with 5% water content to brush the strip steel; washing it with water after removing scale; the strip steel via two steering rollers torsions the strip steel for 180 degrees; via another scale removing box, it removes the ferric oxide skin left on the back of strip steel; feeding it to another wide adjustable free sheath to be stored; feeding it to passive groove; to passivate the strip steel; the strip steel via another cutter is cut; the cut strip steel is fed to the coiling machine to be coiled. The invention has lower cost and lower metal consumption of strip steel, without fuel consumption.

Description

Technical field [0001] The invention relates to a process method and production device for descaling cold-rolled steel sheets, in particular to a process method and production device for acid-free descaling of cold-rolled steel sheets. Background technique [0002] Before strip steel is cold rolled, it is necessary to completely remove the oxide scale (commonly known as "scale") on its surface. The traditional method is to remove the scale by pickling. This method has high cost, high metal consumption and large environmental pollution. Research on a new process of acid-free descaling, but its investment is very large, and some cannot guarantee to meet the production requirements of the bright band. Disadvantages of pickling: 1) High cost: The cost of light acid is about 50 yuan per ton of steel, plus the coal consumption or fuel consumption for heating, the cost per ton is 60-80 yuan, or even higher. 2) Large steel consumption: The steel consumption of general steel mills is 1.5-...

AI Technical Summary

Problems solved by technology

[0003] In view of the fact that the existing cold-rolled strip steel pickling and descaling process consumes a lot of metal, requires heating, and has high cost, and the use of abrasive high-pressure water descaling process requires large investment, many faults, inconvenient maintenance, and sand inclusions on the surface. The purpose of the invention is to provide a process and production device combining mechanical descaling with abrasive high water pressure descaling. The abrasive uses river sand, and the high-pressure water pump uses a multi-stage centrifugal pump with a maximum pressure of 8-12Mpa.

Images