Production method of ultrathin hot-rolled strip steel

Abstract

The invention discloses a production method of ultrathin hot-rolled strip steel. The method comprises the following process steps of A, smelting procedure: feeding scrap steel into an electric induction furnace for smelting such that the scrap steel is smelted into molten steel; B, refining procedure: refining the molten steel by using a ladle refining furnace and a ladle vacuum degassing furnace;C, continuous casting procedure: casting the refined molten steel into a casting strip blank with the thickness of 1.6-2.5 mm through a double-roller thin strip continuous casting system; D, hot rolling procedure: directly sending the casting strip blank formed in the continuous casting procedure into a single-rack hot rolling mill to be rolled to prepare hot-rolled strip steel with the thicknessof 0.8-1.5 mm; and E, cooling and coiling procedure: carrying out atomization cooling treatment on the hot-rolled strip steel, controlling the temperature of the strip steel to be 400-750 DEG C, andcoiling. According to the method, an extremely compact, environment-friendly and economic ultrathin hot-rolled strip steel production process flow is realized, and the environment-friendly and economic continuous production of metal plates and strips is realized.

Description

technical field [0001] The invention relates to the technical field of hot-rolled steel strip production, in particular to a production method of ultra-thin hot-rolled steel strip. Background technique [0002] In recent years, hot-rolled strip steel has gradually developed in the direction of ultra-thin specifications. Thin-gauge hot-rolled strips can not only reduce the number of cold-rolled rolling passes and reduce production costs when used as cold-rolled raw materials, but also open up new uses and new markets for hot-rolled strips, and some products can replace cold-rolled strips , Bring huge economic benefits to manufacturers and users. [0003] In order to save investment cost and production cost, modern iron and steel production enterprises actively carry out technological innovation on the existing production process. Aiming at the problems of long process length, many equipments and complexity in the existing hot strip production process, many manufacturers clo...

AI Technical Summary

Problems solved by technology

[0005] Electric furnace steelmaking is used to provide molten steel, and scrap steel is used as the main raw material. Traditional processes such as die casting or thick plate continuous casting have a solidification cooling rate of only 10 -1 ~10°C / s, these residual elements in the scrap steel will segregate at the grain boundary during the solidification process, which will deteriorate the performance and quality of the steel, and in severe cases, cracking and fracture will occur directly. Therefore, in the traditional process, these harmful elements Strict control is required in the selection of scrap raw materials, some pre-screening is required, and some special treatment is required in the steelmaking process, such as adding some concentrates for dilution, etc., which undoubtedly increases the cost of production operations

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