A straight rolling production method of carbon structural steel plate Q235B

By optimizing the continuous casting and cooling processes, controlling the billet temperature and temperature drop during the transfer process, and combining specific reheating and rolling cooling processes, the problem of high energy consumption in the production of Q235B carbon structural steel plates has been solved, achieving low-energy, high-efficiency direct rolling production that meets national standard mechanical properties.

CN117583568BActive Publication Date: 2026-09-04HANDAN IRON & STEEL GROUP CO LTD +1
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Patent Information

Application Number
CN202311547105.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-20
Publication Date
2026-09-04
Estimated Expiration
2043-11-20

AI Technical Summary

Technical Problem

Existing technologies for producing Q235B carbon structural steel plates are energy-intensive and have complex processes, which do not meet the needs of the steel industry for low-cost and green development.

Method used

By optimizing the continuous casting process, controlling the billet temperature and temperature drop during the transfer process, using insulation covers for heat preservation, and combining specific reheating and rolling cooling processes, heating in the heating furnace is avoided. ACC cooling with intermittent weak cooling mode is adopted to control the cooling rate and final cooling temperature, achieving low-energy production.

Benefits of technology

While ensuring the mechanical properties of the steel plate, the energy consumption for heating the billet was significantly reduced, the process flow was simplified, and efficient direct rolling production was achieved, meeting the mechanical properties required by national standards.

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Abstract

This invention discloses a direct rolling production method for Q235B carbon structural steel plate. The chemical composition and mass percentage of the Q235B carbon structural steel plate are as follows: C: 0.16-0.19%, Si: 0.10-0.30%, Mn: 0.25-0.40%, P≤0.030%, S≤0.025%, with the balance being Fe and unavoidable residual elements and impurities from the production process. The production method includes continuous casting, billet reheating, rolling, and cooling. The superheat during continuous casting is controlled at 25-40℃, and the specific water content in the secondary cooling zone is controlled at 0.46-0.49 L / kg. The casting speed is controlled at 1.1–1.15 m / min, and the average temperature of the billet exiting the fan-shaped section is controlled between 1170–1220℃. After being cut, the continuously cast billet is conveyed to the steel tapping roller conveyor of the heating furnace without being heated in the heating furnace. The temperature drop during the conveying process is controlled below 2℃ / min. After the billet is sent to the steel tapping roller conveyor of the heating furnace, it enters a heat-replenishing and heat-insulating cover with edge heating function for heat replenishment. The billet temperature at the end of the heat replenishment process is controlled at 1150–1200℃. The carbon structural steel plate of this invention meets the national standards in terms of comprehensive performance, significantly reduces energy consumption costs, and has a simple and efficient process.
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