High-pressure low-flow descaling process of four-roller reversing steckel mill

Abstract

The invention relates to a descaling process of a steckel mill, which is a high-pressure low-flow descaling process of a four-roller reversing steckel mill; two sets of independent descaling systems are simultaneously arranged on the steckel mill; one set is high-pressure and high-flow, maintains quite large hitting force, is used when a milled piece is in the starting phase of milling and is quite thick, and removes quite thick primary oxidized iron skin with quite high viscosity; the other set is high-pressure low-flow, reduces the flow while maintaining the descaling pressure unchanged, is used when the milled piece is in the last procedure and is quite thin, removes quite thin and loose secondary oxidized iron skin during the milling process and special oxidized iron skin in a coiling furnace, prevents the over temperature drop of the descaling water to the milled piece, and ensures that the milling temperature meets the process requirements. The high-pressure low-flow descaling process of the four-roller reversing steckel mill can reduce the temperature drop of a steel sheet during a descaling process, can descale in all procedures of the steckel mill, and can prevent the descaling water from entering the coiling furnace.

Description

technical field [0001] The invention relates to a descaling process for a coil mill, in particular to a high-pressure and low-flow descaling process for a four-roller reversible coil mill. Background technique [0002] At present, only one set of high-pressure and high-flow descaling system is used in the fine descaling process of reversible medium and heavy plate mills. The descaling water jet angle is away from the working rolls of the rolling mill, which can be used repeatedly when rolling a steel plate. During the descaling process, a large amount of descaling water will also take away the heat of the steel plate while removing the iron oxide scale of the steel plate. If the same rolled piece is used repeatedly for too many times, the temperature drop of the steel plate will be too large, lower than the normal production temperature, the shape of the plate will be difficult to control, and the rolling force will increase sharply, exceeding the allowable range of the equi...

AI Technical Summary

Problems solved by technology

Moreover, when rolling and descaling, a large amount of descaling water faces the coiling furnace at the front and rear of the machine, and it is very easy to enter the coiling furnace, which will cause the refractory material in the furnace to fall off and cause accidents

[0003] For the four-high reversing steckel mill that adopts the rolling process of medium and heavy plates, there is currently no descaling process that can be used continuously in all passes during the rolling process