A method for producing a hot-rolled steel strip

By controlling the billet thickness and continuous casting speed, setting the finishing rolling temperature, and using a heat insulation cover during the cooling process, the problem of flattened coils of thin-gauge hot-rolled strip steel was solved, thereby improving production stability and economic benefits.

CN116550755BActive Publication Date: 2026-09-15SHOUGANG GROUP CO LTD +1
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Patent Information

Application Number
CN202310470846.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-27
Publication Date
2026-09-15
Estimated Expiration
2043-04-27

AI Technical Summary

Technical Problem

When producing thin-gauge hot-rolled strip steel in the headless mode of a thin slab continuous casting and rolling production line, flattening of the coil is likely to occur, leading to production instability and serious economic losses.

Method used

By controlling the billet thickness and continuous casting speed, setting the finishing mill inlet and final rolling temperatures, and using heat preservation hood equipment during the cooling process, the strip temperature is controlled in stages to ensure the synchronicity of the phase transformation process and avoid flattening of the coil.

Benefits of technology

It effectively reduced the temperature drop during the cooling process, ensured the coiling temperature, prevented the strip from flattening due to uneven phase transformation during coiling, and improved production stability and economic efficiency.

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Abstract

The application relates to the technical field of steel, in particular to a preparation method of hot-rolled strip steel. The thickness of the strip steel is 0.8mm-4.0mm, and the method comprises the following steps: under the condition of setting a casting machine pulling speed, continuously casting by using endless mode molten steel to obtain a casting blank; wherein the thickness of the casting blank is controlled to be a set thickness; under the condition of setting a rolling inlet temperature and a set rolling final rolling temperature, finish rolling is conducted on the casting blank to obtain a hot-rolled plate; the hot-rolled plate is subjected to stage cooling to make the hot-rolled plate have a set temperature, and then is coiled to obtain the hot-rolled strip steel; wherein the cooling process comprises heat preservation treatment on the hot-rolled plate. The application solves the technical problem of producing flat coils of thin-specification hot-rolled strip steel by using the existing thin slab continuous casting and rolling production line in endless mode.
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