Rough rolling descaling method for hot-rolled steel billet

Abstract

The invention relates to the technical field of hot-rolled steel billet rough rolling, and provides a hot-rolled steel billet rough rolling descaling method, which divides water flow into low-pressure cooling water flow and high-pressure cleaning water flow, realizes step-by-step cooling fracture and cleaning, improves the dephosphorization effect, provides inert gas protection for dephosphorized hot-rolled steel billets, and improves the dephosphorization quality of the dephosphorized hot-rolled steel billets. According to the hot-rolled steel billet rough rolling descaling system, secondary oxidation of hot-rolled steel billets after dephosphorization is reduced, a roller set is provided with an independent cleaning device in a matched mode, adhesion of oxidized scales on the roller set is reduced, reintroduction of the oxidized scales in the rolling process of the hot-rolled steel billets is reduced, and the hot-rolled steel billet rough rolling descaling system is practical and is achieved based on the hot-rolled steel billet rough rolling descaling system. Comprising the following steps that firstly, the hot-rolled steel billet rough rolling descaling system is built in a construction site, electric fitting and debugging of corresponding parts are completed, in the process, a high-pressure water inlet pipe and a water supply tank need to be communicated with an external high-pressure water pipe, and a low-pressure water inlet pipe needs to be communicated with an external low-pressure water pipe; and a gas source of inert gas is communicated with the gas supply box.

Description

technical field [0001] The invention relates to the technical field of rough rolling of hot-rolled billets, in particular to a method for rough rolling and descaling of hot-rolled billets. Background technique [0002] As we all know, in the process of hot rolling a billet, the billet usually needs to be heated, and the heated billet will be oxidized in the air to produce oxidized scales. These scales will not only make subsequent rolling difficult, but also easily penetrate into the billet. Therefore, in order to ensure the smooth rolling of the billet and the guarantee of the quality after rolling, a method for rough rolling and descaling of the hot-rolled billet is proposed. [0003] After retrieval, the Chinese invention patent with the publication number CN103042055B, which was authorized and announced on June 10, 2015, discloses a method for rough rolling and descaling of a hot-rolled steel billet, which is roughly described as including the first pass on the heated bi...

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Problems solved by technology

[0004] Although the above-mentioned existing technical scheme can clean the scales produced in the hot rolling process of steel billets, due to the high-pressure water flow, it is necessary to realize the rapid cooling of the oxide scales at one time and cleaning, so part of the oxidized scales will pass through the high-pressure water flow area before being cold-shrinked and cracked after rapid cooling, resulting in incomplete phosphorus removal. It will be re-oxidized, and because the rolls are in frequent contact with the hot-rolled billet during the rolling process, it is inevitable that the oxide scale will adhere to it, resulting in the re-introduction of the oxide scale during the rolling process of the hot-rolled billet, and the practicability is poor

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