Cold-rolling and hot-dip integrated production method of steel plate and steel plate

Abstract

The invention discloses a cold-rolled hot-dip integrated production method for a steel plate and a steel plate and relates to the technical field of steel plate production. The method comprises following steps: A. trail ends of a previous rolled steel plate remaining from the previous processing is left in a welding machine; a hot rolled coil was unwound to obtain a later rolled steel plate; the later rolled steel plate is straightened and the plate head is cut off; the head end of the later steel plate is welded with the tail end of the previous rolled steel plate; the welded steel plate is sent to an inlet loop; B. the welded steel plate is sent to a rolling mill through the inlet loop to perform cold rolling; the steel plate is degreased, reduced and annealed; hot dip is performed to obtain a plating steel plate; the plating steel plate is cooled, stretch bent and straightened, passivated, and sent to an outlet loop; C. the processed plating steel plate is sent out through the outlet loop, the plate tail is cut off, and the plating steel plate is reeled. During the whole production process, continuous production is realized through controlling the speed and tension force of the production line. By means of the method, fixed investment cost, production cost, and current capital can be saved which brings huge economic value.

Description

technical field [0001] The invention relates to the technical field of steel plate production, in particular to a cold-rolling-hot-galvanizing integrated production method of a steel plate and the steel plate. Background technique [0002] At present, domestic and foreign steel plate manufacturers generally adopt a separate production process of steel plate cold rolling line and steel plate coating line, among which, [0003] The production process of cold-rolled steel plate is as follows: using hot-rolled steel plate as raw material, uncoiling → head cutting → cold rolling → tail cutting → coiling to obtain cold-rolled steel plate; [0004] The production process of hot-rolled steel plate coating is as follows: using hot-rolled steel plate as raw material, uncoiling→straightening→cutting head→welding→entry looper→reduction annealing→hot galvanizing→air cooling→water cooling→stretch bending straightening→passivation→ Export looper → tail cutting → coiling [0005] The prod...

AI Technical Summary

Problems solved by technology

[0006] The separate production process of steel plate cold rolling line and steel plate coating line has the following disadvantages: (1) high investment in fixed assets; (2) high production cost; (3) large working capital and long capital turnover days

For example, some steel plate production lines use reversible rolling mills for production. The disadvantage of using reversible rolling mills is that only the thickness of the middle part of the steel plate meets the requirements, and the head and tail of the plate need to be cut off, resulting in a lot of waste.

Some steel plate production lines adopt the method of continuous rolling, which does not need to cut off the head and tail of the plate, but requires more than five rolling mills, and the cost is too high

Some steel plate production lines adopt the production method of continuous casting and rolling, the processed steel plate is hard and the machining performance is not good

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