BE900675A - Cooling moving metal product - by turbulent water flow over plane surface - Google Patents

Abstract

Moving metal prod., e.g. rolled sheet, section or rail, or continuously cast slab, with at least 1 plane surface, is cooled by continuous flow of an aq. medium. - A space is formed by a partition opposite the plane surface and approximately parallel to it, which is completely filled by the aqueous medium. The medium is introduced through openings, in the partition, so that, flowing through it, it produces turbulence, in the medium filling the space. The specific flow of aq. medium is 5-80 litres per square metre, and the distance between the plane surface to be cooled, and the partition 5-300mm.

Description

       

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  CENTRUM VOOR RESEARCH IN DE METALLURGIE, CENTER DE RESEARCHES METALLURGIQUES, Non-profit association-
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 Vereniging zonder winstoogmerk in BRUXELLES, (Belgium).
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 process for cooling a moving metal product.



  The present invention relates to a method for cooling a moving metal product.



  It applies to the cooling of any metallic product, in scrolling movement, presenting at least one flat surface. This is the case for example with laminated products such as
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 sheets, sheets as well as casting products. and billets. such as slabs and The problem of cooling these products has always been the subject of particular attention, because it primarily conditions either the regularity of the structure of the product, or its regular evolution over time.

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With this in mind, one of the most widely used means of ensuring this cooling consists in directing jets of an appropriate cooling agent, such as air, water, steam, isolation, mixed or sprayed together, using suitable devices.



   In his Belgian patent No. 851. 381, the present applicant has already proposed a device intended to ensure the cooling of a product of this type, by spraying water sprayed with air, in the form of jets directed onto the surface of the product.



   Although it allows the desired cooling to be carried out satisfactorily, this device has certain disadvantages which increase with the width of the product to be cooled.



   First, its use requires volume. increasing compressed air, which can seriously increase the cost of operation for large products.



     It is moreover difficult to ensure and maintain a homogeneous distribution of the air and cooling water flows in very long devices, due to the differences in pressure drops.



    The present invention has for a method making it possible to remedy these drawbacks.



  The process, which is the subject of the present invention, for cooling, by means of an aqueous liquid continuously discharged, a metallic product in movement, product having at least one flat surface, is characterized in that the a space is formed by placing a wall opposite the said flat surface Y1

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 and substantially parallel thereto, in that the said space is completely filled by means of the abovementioned aqueous liquid, the latter being introduced into the said space through at least one orifice formed in the said wall, and in that by means of the aqueous liquid itself, delivered by the said port (s), agitation of the aqueous liquid is created filling said space.



  According to an interesting implementation of the process of the present invention, the specific flow rate of the aqueous liquid is between 2 2 and 5 l / m. s and 80 l / m. s, and the distance between the flat surface of the product to be cooled and said wall is between 5 mm and 300 mm.



  According to the invention, the aforementioned specific flow and distance are chosen as a function of the intensity of the cooling to be applied to the metallic product.



  The method of the invention thus makes it possible to modify the intensity of the cooling applied as a function of the type of product to be obtained. It is in particular possible by this process to produce coolings leading both to mild steel products and to quenched and self-tempering products (Q S T - quenched and self-tempered products).


    

Claims (2)

Claims. 1. A method for cooling, by means of an aqueous liquid continuously discharged, a moving metal product, product having at least one flat surface, characterized in that a space is formed by having a wall opposite the said plane surface and in a manner substantially parallel to it, in that the said space is completely filled by means of the abovementioned aqueous liquid, the latter being introduced into the said space through at least one orifice formed in the said wall, and in that by means of the aqueous liquid itself, delivered by the said orifice (s), an agitation of the aqueous liquid is created filling the said space. 2. Method according to claim 1, characterized in that the specific flow rate of the aqueous liquid is between 5 1 /  EMI4.1  2 2 m. and 80 l / m. s and in that the distance between the flat surface of the product to be cooled and said wall is between 5 mm and 300 mm.