Method for producing hot-rolled steel strip with thickness ≤ 1.2 mm by continuous casting and rolling of thin slab

Abstract

The thin slab continuous casting and rolling production method of the present invention has a thickness of less than or equal to 1.2mm hot-rolled steel strip, comprising the following steps: 1) steelmaking: converter smelting, refining outside the furnace and continuous casting into billets, the thickness of the continuous casting billets is 52 ~ 55mm; 2) Soaking: The continuous casting slab is released at a temperature of 1200-1220°C; 3) Descaling: Perform high-pressure descaling on the soaked continuous casting slab; 4) Finishing rolling: The continuous casting slab enters the finishing rolling unit, Rolling is carried out with dynamic variable specification technology, the reduction of dynamic variable specification is 50-200μm, the timing of dynamic variable specification reduction is 80-150m from the strip head, the final rolling temperature is 840-860℃, and the continuous casting slab is finished rolling Thin-gauge strip steel is formed after rolling by the unit; 5) coiling: the thin-gauge strip steel is coiled after laminar flow cooling, and the coiling temperature is 610-630°C. The thinnest thickness of the hot-rolled steel strip produced by the invention is 0.8mm, and the strip is threaded stably, and the phenomena of folding and crushing are not easy to occur.

Description

technical field [0001] The invention relates to the field of thin-gauge hot-rolled steel strip manufacturing, in particular to a thin slab continuous casting and rolling method for producing hot-rolled steel strip with a thickness of ≤1.2mm. Background technique [0002] According to the market development trend analysis, there is a wide market demand for thin-gauge thin-gauge strips for container manufacturing, construction machinery, automobile manufacturing and other equipment, and it is also the development direction of high value-added hot-rolled strips. In addition, as the industry pays more and more attention to light weight and cost reduction, the whole industry has an urgent demand for hot rolling thinning. [0003] At present, the production of hot-rolled steel strips with a thickness of ≤1.2mm mainly includes semi-endless rolling at Lianyuan Iron and Steel Co., Ltd., full-endless (ESP) rolling at Rizhao, and full-endless (CEM) rolling at Pohang, South Korea; With...

AI Technical Summary

Problems solved by technology

[0004] However, in the process of using the CSP thin slab continuous casting and rolling production line to produce thin-gauge hot-rolled strip steel, due to the extremely thin strip steel, the phenomenon of head folding and rolling is prone to occur during the strip threading process, which seriously affects the rolling process. stability

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