Method for improving deformation and permeability in high-thickness standard steel plate hot rolling process

Abstract

A method for improving deformation and permeability in the high-thickness standard steel plate hot rolling process is characterized in that a uniform fast cooling device is arranged at a position close to the opening of a heavy and medium plate mill or hot strip roughing mill with the length being 5 to 15 meters and the cooling total water being 3,000 to 6,000 cubic meters per hour respectively; before rolling, the cooling device conducts asymmetrical uniform fast cooling to the upper and lower surfaces of a plate blank, a low-temperature hardened layer is formed on the surface of the plate blank, the temperature gradient of a core reaches 2 to 3 DEG C per millimeter, before the cooling returns red, the cooling device can quickly enter the mill to conduct differential temperature rolling, and plate blank core deformation is improved; the cooling device is further combined with asymmetrical rolling, while deepening the plate blank core deformation, the cooling device solves the warping problem caused by the asymmetrical rolling through the asymmetrical cooling of the upper and lower surfaces of the plate blank before rolling. For a steel ball needing two-stage control, the uniform fast cooling device can replace a middle cooling device, shortens or even eliminates the temperature waiting time of swinging steel, and improves the production efficiency.

Description

technical field [0001] The invention relates to the technical field of metal thermal processing rolling and cooling, in particular to a process method for improving the deformation permeability of a thick-gauge steel plate or a strip rough-rolled hot rolling process. Background technique [0002] Thick plate (steel plate thickness 20mm-60mm) and extra-thick plate (steel plate thickness greater than 60mm) are widely used in both military and civilian applications, and are important raw materials for national economic development. However, the rolling production process of thick plates and extra thick plates is limited by conditions such as continuous casting billet size, deformation uniformity, and compression ratio on the one hand, and on the other hand by domestic rolling conditions such as mill stiffness, mill power, opening degree, The rolling process and subsequent finishing equipment such as rectification are limited, the production technology is very difficult, the pro...

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Problems solved by technology

At present, some scholars in China use planar compression testing machines to simulate the rolling process, and combine finite element numerical simulation to study the rolling deformation and grain size distribution of steel plates under a given temperature gradient. The temperature gradient and how to configure the cooling device did not give a corresponding plan; in addition, the current existing rolling process puts the cooling device in the cooling zone after the finishing mill or the intermediate roller table between the roughing mill and the finishing mill. And there is a certain distance from the rolling mill

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