On-line quenching and plate shape control process of wide and thick plate for water and electricity

Abstract

The invention relates to an on-line quenching and plate shape control process of wide and thick plate for water and electricity. According to the process, jet cooling on-line quenching is performed by using positive jetting, positive jetting and reverse jetting as one unit; in a jet impact region, cooling water and the surface of a steel plate perform heat exchange; meanwhile, most of cooling water is limited in the jet impact region using the positive jetting, positive jetting and reverse jetting as the unit. According to the thickness specification classification of the (wide) thick plate for water and electricity; the passing type cooling or swinging type cooling on-line quenching is selected; the maximum heat exchange efficiency of cooling water and the steel plate is realized; a good cooling plate shape is obtained. The process has the advantages that the temperature uniformity of an on-line quenching steel plate through plate is ensured; the off-line quenching of the (wide) thick plate for water and electricity is transplanted to on-line production; the production flow is simplified; the production cost is reduced; meanwhile, heat treatment production line resources are saved; the cargo supply period is shortened.

Description

technical field [0001] The invention relates to an on-line quenching and shape control process for wide and thick plates, in particular to an on-line quenching and shape control process for wide and thick plates for hydropower based on inclined jet flow technology. Background technique [0002] The post-rolling cooling technology of medium and heavy plates provides a process window for the regulation and control of steel grades, and plays a huge role in the product development process. With the urgent need for the development of advanced steel materials and the development trend of steel types produced by short-process processes, the cooling technology of jet impingement heat exchange has highlighted its advantages. However, at present, domestic single-frame or double-frame medium / wide thick plate production lines are equipped with less inclined jet flow cooling devices, and most of them use vapor mist cooling, laminar flow cooling, encrypted laminar flow cooling, single fra...

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Problems solved by technology

In 2009, the Chinese patent application (application number 200810196040.2) announced the "Process for On-line Quenching of Steckel Rolling Mill to Produce High Stress and Tempering Steel". This invention uses a columnar laminar cooling device with U-shaped upper header and straight tube lower header. Production of high-strength and tempered steel with a thickness of 12-35mm, the minimum cooling rate is 15°C / s, and the cooling termination temperature is 150-300°C; after cooling, warm and cold straightening is used to ensure that the unevenness of the steel plate before offline tempering reaches 8-10mm / Full plate width increases the process cost; for steel plates with a thickness above 35mm, online quenching and cooling is not realized

When the above-mentioned curtain laminar flow cooling device and columnar laminar flow cooling device are used for cooling, the range of breaking the steam film is limited to the local area directly under the continuous water flow. In other areas, due to the existence of the steam film between the steel plate and the cooling water, the cooling efficiency The old cooling water has a large flow space and many flow directions, which is not conducive to the control of the shape of the cooling plate. The water temperature and cooling method when using the above cooling device for online quenching are not mentioned.

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