A method for producing dual-phase steel with a plate width of ≥1800 mm

Through fine control of multiple process parameters, the problems of poor production stability and low pass rate of duplex steel with width ≥1800mm in the prior art were solved, and efficient and stable production was achieved, with a pass rate of more than 75%, and the performance met user needs.

CN115591933BActive Publication Date: 2025-03-04武汉钢铁有限公司
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Patent Information

Application Number
CN202211152193.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-09-21
Publication Date
2025-03-04
Estimated Expiration
2042-09-21

AI Technical Summary

Technical Problem

The prior art is difficult to effectively produce duplex steel with a width of ≥1800mm, resulting in poor production stability and low pass rate, and easy to cause belt breakage due to deviation, which seriously affects production efficiency.

Method used

By controlling the plate convexity of hot-rolled raw materials, pickling temperature and free acid concentration, cold rolling pressure rate, emulsion temperature, working roll convexity and inclination, annealing temperature and speed, tension control and other process parameters, the plate shape and performance of the steel plate are ensured.

Benefits of technology

The stability and pass rate of duplex steel with a production width of ≥1800mm were significantly improved, with a pass rate of more than 75%, and a tensile strength of ≥500MPa, meeting the performance needs of users.

✦ Generated by Eureka AI based on patent content.

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Abstract

A method for producing dual-phase steel with a plate width of ≥1800mm: conventional hot rolling and hot rolling plate surface convexity; pickling; cold rolling using five stands, refining the group spacing according to the thickness of the finished product and controlling the cold rolling reduction rate; continuous annealing; flattening. The present invention not only has a strip width of ≥1800mm, but also has a stable production process, the qualified rate can be increased from the current 40% to more than 75%, the tensile strength is ≥500MPa, and the performance meets the needs of users.
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Citation Information

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