Free cooling method of hot rolling band steel

Abstract

The invention provides a free cooling method of hot rolling band steel, which featured in that temperature testing devices and induction feedback devices are arranged respectively at the fine rolling outlet, the coiling inlet and the laminar flow cooling roller way acting as the middle portion of the cooling device; the temperature of the laminar flow cooling water in the three sections are adjusted and controlled after the coiling temperature difference of the head and tail of the band steel and the middle portion of the band steel is tested and fed back. Therefore, the method of the invention can not only control the head and tail temperature of the band steel freely, but also control the length of the head and tail of the band steel freely.

Description

technical field [0001] The present invention relates to the field of metallurgy, specifically, the present invention relates to a strip steel hot rolling cooling method, and more specifically, the present invention relates to a kind of hot steel strip coming out from the last rolling stand (end mill roll) of finish rolling to the coiling section With laminar cooling method. Background technique [0002] Hot rolling is to use slab (mainly continuous casting slab) as raw material, and after heating, it is made into strip steel by rough rolling unit and finishing rolling unit. The hot steel strip coming out of the last rolling stand of finishing rolling is cooled to the set temperature by laminar flow, and rolled into a steel strip coil by the coiler. The cooled steel coils are processed into steel plates, flat coils and Slit strip products. Hot-rolled strip steel is often used as structural steel, so it requires high performance processing. [0003] As mentioned above, a l...

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Problems solved by technology

[0014] However, in the patent application for "CN02144825.6" and the patent application titled "Laminar Flow Cooling Method for Hot-Rolled Strip Middle Billet", because it mainly performs cooling control at the rough rolling exit, it does not focus on strip steel. The cooling from the rolling exit to the coiling is taken into consideration. At the same time, the patented technology mainly cools the intermediate billet, but does not cool the finished strip steel. As a result, there is a big difference in its control.

[0015] In the authorized patent with the patent number "CN200410021048.7", the invention name is "a strip laminar flow cooling device and its control cooling method", the patent number is "CN02132975.3", the invention name is "hot-rolled strip steel three The latter is closer to the technical solution of this declaration among the authorized patents, the patent number is "CN02132975.3", and the invention name is "three-stage laminar cooling process for hot-rolled strip". A more flexible segmentation method can be adopted for the strip on the laminar cooling roller table, so the temperature rise of the strip head and tail cannot be realized, and there is no free control of the strip head and tail temperature

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