Method for producing hot-rolled strip steel with thickness being smaller than or equal to 1.2 mm through thin slab continuous casting and rolling

Abstract

The invention discloses a method for producing hot-rolled strip steel with the thickness being smaller than or equal to 1.2 mm through thin slab continuous casting and rolling. The method comprises the following steps that (1) steelmaking is conducted, specifically, strip steel is smelted in a converter, refined outside the converter and subjected to continuous casting to be a billet, and the thickness of the continuous casting billet is 52-55 mm; (2) heat uniformizing is conducted, specifically, the tapping temperature of the continuous casting billet is 1200-1220 DEG C; (3) descaling is conducted, specifically, the continuous casting billet after heat uniformizing is subjected to high-pressure descaling; (4) finish rolling is conducted, specifically, the continuous casting billet entersa finish rolling unit to be rolled through the flying gauge change technology, rolling reduction of flying gauge change is 50-200 [mu]m, the rolling timing sequence of flying gauge change is the distance away from the head of the strip steel by 80-150 m, the final rolling temperature is 840-860 DEG C, and the continuous casting billet is rolled through the finish rolling unit to form thin-specification strip steel; and (5) coiling is conducted, specifically, the thin-specification strip steel is cooled through a laminar flow and coiled, and the coiling temperature is 610-630 DEG C. The smallest thickness of the hot-rolled strip steel produced through the method is 0.8 mm, threading is stable, and the folding and rolling-breaking phenomena are not prone to occurring.

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 ≤1.2 mm. 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; Wit...

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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