A control method for reducing the risk of blister and porosity defects in high hydrogen content slabs

By controlling moisture content throughout the entire process, monitoring hydrogen content, and coordinating the heating regime, the bulging and porosity defects of high-hydrogen-content slabs under the low-iron-consumption process were resolved, achieving efficient quality control and production stability.

CN122184306APending Publication Date: 2026-06-12HUNAN VALIN LIANYUAN IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUNAN VALIN LIANYUAN IRON & STEEL CO LTD
Filing Date
2026-04-22
Publication Date
2026-06-12

AI Technical Summary

Technical Problem

Under low iron consumption process conditions, high hydrogen content in molten steel can easily lead to honeycomb-like pores and bulging defects in slabs during solidification, and existing technologies cannot achieve coordinated control of the entire process.

Method used

By controlling moisture and hydrogen content throughout the entire process, coordinating the slow cooling of slabs and the heating regime, including baking preheating, dynamic monitoring, controlled stack cooling and precise heating, moisture and hydrogen content are reduced, cooling rate is slowed down and heating process is optimized.

Benefits of technology

This effectively reduces the risk of bulging and porosity defects in high-hydrogen-content slabs, ensuring steel quality and improving production stability and efficiency.

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Abstract

The present application relates to the technical field of steel metallurgy continuous casting, and particularly relates to a control method for reducing the risk of slab bulging and pore defects with high hydrogen content, which comprises the following steps: S1, performing moisture and crystallization water inhibition, preheating and baking the material and container and limiting the exposure of flux; S2, monitoring the hydrogen content of the tundish; S3, performing controlled slab cooling, adopting hot slab'sandwich' stacking or slow cooling with a heat preservation cover, and strictly prohibiting the stacking within 36 hours; S4, matching the hot rolling heating process, and controlling the storage age, in-furnace time and temperature rising speed. The present application can realize the collaborative regulation of the whole process of steelmaking, continuous casting and hot rolling, reduce the hydrogen source from the source, provide sufficient kinetic conditions for hydrogen atom diffusion, and effectively solve the slab bulging, pore and hot rolling hole defects caused by high hydrogen under the process of low molten iron consumption.
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