A steel plate production method, device and control system for online solid solution of steel plates

Abstract

The invention provides a steel plate production method, a device and a control system for steel plate on-line solution, and belongs to the technical field of metallurgy. According to the method, excess rolling heat after a steel plate is rolled is utilized to perform on-line solution treatment on the steel plate to obtain a specific steel plate microstructure and various properties in line with product requirements, so as to reduce carbon emission and lots of energy consumption during secondary heating of off-line heat treatment. The device for production and the control system are less in investment; and the cooling device is compact and high in cooling rate, can save energy, can cool steel plates with a wide thicknesses specification range in a controlled manner, is high in automatic control precision, makes a cooled steel plate good in shape, not only can be used in steel plate on-line solution treatment, but also can be applied to a process needing rapid cooling after rolling, even an off-line quenching process.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an on-line solid solution treatment after steel plate rolling. Background technique [0002] Solution heat treatment refers to the heat treatment process in which the alloy is heated to a high-temperature single-phase region and maintained at a constant temperature, so that the excess phase is fully dissolved into the solid solution and then cooled rapidly and uniformly to obtain a supersaturated solid solution. Mainly to improve the plasticity and toughness of steel and alloys, to prepare for precipitation hardening treatment, etc. It can fully dissolve various phases in the alloy, strengthen the solid solution, improve toughness and corrosion resistance, relieve stress and soften, so as to continue processing or forming. Suitable for many special steels, especially high manganese steel and austenitic stainless steel. For alloys with low supersaturation, faster ...

AI Technical Summary

Problems solved by technology

[0011] The patent with the application number 201010560843.9 discloses a device and process for direct quenching of medium and thick plates. The technical solution adopts a laminar flow cooling device with adjustable upper and lower flow rates, increases the water flow density through a close-packed form, and controls the width through an edge shielding device. However, the laminar flow cooling device is easy to form a large amount of stagnant water on the surface under the large water flow, which affects the cooling uniformity, especially for wide plates; the setting of the shielding amount of the edge shielding device and the control of the actual shielding position are critical problem, the patent does not address

[0012] The patent application number 200910091825.8 discloses a direct quenching process suitable for high-strength and tough steel plates of different thicknesses. It adopts high-density laminar flow cooling, and consists of a strong cooling section, a rough cooling section and a fine cooling section by an upper laminar flow header and a lower spray header. section, the adjustable flow ratio of the strong cooling section is 1:1.4~1:3.0, the flow ratio of the rough cooling section and the fine cooling section is fixed at 1:1.5, and the thickness range of the steel plate that can be cooled is 1~50mm, but it only has the flow rate of the strong cooling section Adjustable, the ratio of flow to water in the rough cooling section and the fine cooling section is fixed, the flow in the width direction of the steel plate is not adjustable, it is difficult to control the shape of the thin plate well, and when the cooling intensity of the thick plate is insufficient, the equipment cannot realize the cooling of the pendulum steel

[0013] The patent with the application number 200810013604.4 discloses an online quenching production process for high-strength and tough thick steel plates. It adopts the water curtain cooling method, which is only suitable for thick steel plates with a finished thickness of 20-50mm. It is difficult to solve the problem for thinner steel plates because of cooling. The flatness of the plate shape caused by unevenness, and the strict requirements on the composition, it is difficult to popularize in the field of alloy steel production

[0014] To sum up, many unique designs and research results have been put forward for some problems of online cooling after rolling at home and abroad, and good results have been achieved in solving some specific problems, but there are also many design defects. For example, most of them are unconstrained cooling, and it is difficult to ensure the shape of the cooled plate at high cooling speeds; they are generally installed after the rolling mill or after the pre-leveling machine and before the hot leveling machine; generally, DQ+ACC devices are used The layout form makes it difficult to achieve a consistent cooling rate throughout the cooling process; in order to achieve a large temperature drop, most devices require a large amount of water, which is a serious waste of resources; there is no detection and tracking means for the steel plates in the cooling area, and it is difficult to achieve accurate steel placement and fully automatic control

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