Hot-rolled strip steel full-continuous production device and method for ferrite rolling

Abstract

The invention discloses a hot-rolled strip steel full-continuous production device and method for ferrite rolling. The hot-rolled strip steel full-continuous production device is characterized in thatthe production line of the device is short, and components are reasonably configured; a multifunctional cooling control device is adopted, and high-pressure water descaling and intermediate blank cooling functions are integrated so as to achieve simplicity and high efficiency; and 4R+(3-4) rolling mills, four temperature detectors and close-range underground coilers are arranged, so that the cooling load of an intermediate billet is reduced, accurate temperature control of the process is achieved, and the product quality is conveniently improved. The method comprises the steps of continuouslycasting to manufacture the billet; dephosphorizing by high-pressure water rotary; carrying out rough rolling by using a four-frame large screw-down rough rolling unit; shearing by using a rotary drum; carrying out cooling in a multifunctional cooling control device after dephosphorization through the high pressure water; performing fine rolling by using a three-frame or four-frame fine rolling unit; carrying out air cooling; shearing and dividing rollers by using a high-speed flying shear; and reeling by using a underground coiler, wherein the temperature monitoring is respectively carried out before roughing rolling, before and after fine rolling, and before reeling by the underground coiler. The method has the advantages of energy consumption and low cost, good product quality and thinthickness, and is capable of better meeting the performance requirement of replacing cold with heat.

Description

technical field [0001] The invention belongs to a fully continuous production device and method for hot-rolled strip steel, in particular to a fully continuous production device and method for hot-rolled strip steel used for ferrite rolling. Background technique [0002] Ferrite rolling is a new technology proposed by Belgian Professor Appell in the mid-1970s. At first, the main purpose was to simplify the process and save energy. Using traditional continuous casting slabs as raw materials, ferrite rolling produced a A cheap, soft, non-aging hot-rolled plate that can be used directly or subsequently for cold-rolled production. Due to the relatively large ferrite zone range and high temperature of low-carbon and ultra-low-carbon steels, the current ferritic rolling technology is mainly used in the production of low-carbon and ultra-low-carbon steels. [0003] The ferritic rolling process based on the traditional hot rolling process, due to the limitation of equipment capacit...

AI Technical Summary

Problems solved by technology

Since it is difficult to control the temperature of the strip steel by water cooling between the racks and the accuracy is difficult to guarantee, the patent CN201721755853 proposes a ferrite rolling control system. The key point of the process is to use a tunnel between rough rolling and finish rolling Type soaking furnace to achieve uniform temperature control

In addition, patents CN201710960186 and CN201710960187 also proposed a ferrite rolling method and device for endless continuous casting and rolling of low-carbon steel for deep drawing and ultra-low carbon steel for ultra-deep drawing, and adopted a new layout. Partial improvements have been made, but the layout of the rolling mill, the setting of the intermediate billet cooling device, the setting of the coiler, and the accurate detection and control of the temperature in the whole process cannot fully meet the requirements of ferrite rolling for high intermediate billet temperature. Control precision, "one low and two high" strict temperature control requirements for the finishing rolling process and coiling process, that is, use a lower finishing rolling start temperature, and at the same time require a higher finishing rolling temperature and coiling temperature to meet Process requirements for recrystallization and recovery of the internal structure of ferritic rolled products

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