A kind of steel plate controlled rolling method

Abstract

The invention relates to a steel plate controlling and rolling method which comprises the following steps: rolling the thickness of the steel plate to temperature-waiting thickness; causing the steel plate to enter a temperature-waiting process; after the temperature of the steel plate is lowered to the temperature-waiting rolling temperature, continuously rolling the steel plate until the thickness satisfies the thickness requirement of a finished product; and finishing rolling. The steel plate controlling and rolling method is characterized by also comprising the following steps: in the temperature-waiting process, stopping rolling the horizontal roll of the steel plate; and carrying out vertical roll independent rolling on the steel plate, wherein the rolling passes comprises Ith-(I+i)th passes, and the i is more than 0 and less than 4. In the method, the temperature-waiting time of the steel plate is utilized, the vertical roll is independently used for multiple-pass lateral pressing instead of horizontal roll-in rolling, the advantage that the effect of regulating the width by the vertical roll is good is reserved, and the weak point of prolonging the rolling time interval is avoided, thus the width size precision of the steel plate is improved so as to improve the pass percent of the product, and the final purpose of avoiding lowering the yield is achieved.

Description

technical field [0001] The invention belongs to the field of steel plate rolling, and in particular relates to a steel plate controlled rolling method. Background technique [0002] Controlled rolling, that is, controlled rolling. That is to say, on the basis of adjusting the chemical composition of the steel, by controlling the heating temperature, rolling temperature, deformation system and other process parameters, the change law of the austenite structure and the structure of the phase transformation product are controlled to refine the structure and increase the strength. And the purpose of toughness is a rolling method to improve the performance of steel products. [0003] In the existing steel plate controlled rolling process, the process flow chart is as follows figure 1 As shown, its main feature is that when the steel plate is rolled to a certain thickness (that is, the thickness of the steel plate to be warmed), the rolling is automatically suspended. At this ti...

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Problems solved by technology

[0006] However, the shortcomings of the existing steel plate controlled rolling process are: in the prior art scheme, vertical rolls and horizontal rolls are used in combination, wherein, in order to carry out the rolling of the vertical roll pass, the throwing distance of the steel plate in the previous pass must be relatively short. In this way, the time interval between vertical rolls and horizontal rolls combined rolling passes becomes larger, and the steel plate adopts a natural cooling method during the warming stage, which leads to a long time for the steel plate to be warmed, which eventually reduces production efficiency and affects rolling output.

However, this patent application only uses the method of shortening the heating time of the steel plate to improve the rolling efficiency, and does not adopt any rolling process for the steel plate in the heating stage, and improperly shortening the heating time of the steel plate will also affect the structure of the steel plate. Bad influence, moreover, the disadvantages are: 1. Increase the water cooling device, increase equipment investment and subsequent operating costs; Inhomogeneous steel plate temperature is bound to appear in the process, which will easily cause uneven structure and properties of the steel plate, aggravate the uneven distribution of internal stress, and lead to an increase in the rate of defective shape of the steel plate

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