A Method for Improving Deformation Penetration of Thick Gauge Steel Plate in Hot Rolling Process

Abstract

A method for improving the deformation permeability of thick-sized steel plates during hot rolling, which is characterized by setting up uniform and rapid cooling devices immediately adjacent to the mouth of the medium-thick plate rolling mill or the hot-band roughing mill, with a length of 5 to 15 m and a total cooling water volume of 3000 to 6000 m3 / h; Before rolling, the slab is uniformly and asymmetrically cooled on the upper and lower surfaces, forming a low-temperature hardened layer on the surface of the slab, and the temperature gradient with the core reaches 2~3°C / mm, and before the slab returns to red after cooling Quickly enter the rolling mill for differential temperature rolling to improve the deformation of the core of the slab; and further combine it with asynchronous rolling to deepen the deformation of the core of the slab and solve the problem of asynchronous rolling through asymmetric cooling of the upper and lower surfaces of the slab before rolling. warping problem caused by manufacturing. For steel types that require two-stage controlled rolling, the uniform rapid cooling equipment involved in the present invention can replace the intermediate cooling equipment, shorten or even eliminate the waiting time for the swing steel to warm up, and improve 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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