Process control method for deeply removing hydrogen and oxygen impurities in molten steel in RH vacuum circulation degassing device

By coordinating the control of multi-stage vacuum pumps and optimizing the circulating gas volume, the problem of unstable dehydrogenation efficiency in RH treatment was solved, achieving deep removal of hydrogen and oxygen impurities from molten steel and stable temperature control, thus meeting the production requirements of high-end steel grades.

CN121674653APending Publication Date: 2026-03-17BAOTOU IRON & STEEL (GROUP) CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202511862869.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-11
Publication Date
2026-03-17

AI Technical Summary

Technical Problem

In traditional RH treatment, the dehydrogenation efficiency is unstable, the start-stop logic of the vacuum pump group is not matched with the degassing kinetics of molten steel, improper addition of cold materials and alloys affects the degassing balance, the risk control of hydrogen increase is insufficient, and the fixed circulating gas volume leads to insufficient mixing of molten steel, making it difficult to stably control the hydrogen and oxygen impurity content of molten steel.

Method used

The system employs dynamic collaborative control of multi-stage vacuum pumps, precisely controlling the pump group's start and stop in stages according to the vacuum level, optimizing the circulating gas volume in four stages, precisely controlling the timing of cold material addition, reducing moisture through baking of alloys and raw materials, adjusting the alloy composition within the internal control range, maintaining the vacuum level after fine-tuning the cold material alloy, controlling the temperature fluctuation of molten steel, and optimizing the degassing process.

Benefits of technology

It achieves deep removal of hydrogen and oxygen impurities from molten steel, controls temperature fluctuations within ±3℃, shortens vacuum establishment time, reduces steam consumption per ton of steel by 28%, and improves degassing efficiency, meeting the production requirements of high-end steel grades.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN121674653A_ABST
    Figure CN121674653A_ABST
Patent Text Reader

Abstract

The invention discloses a process control method for deeply removing hydrogen and oxygen impurities in molten steel in an RH (Ruhrstahl Heraeus) vacuum circulating degassing device. The process control method comprises the following steps that a steel ladle is pretreated to be continuously used for six times, the temperature of a refractory material is 1020 DEG C, the slag thickness of the steel ladle is smaller than the upper limit of 200mm, and the water content of a gunning material of a dip pipe is 0.03%. Alloy and raw and auxiliary materials used in the RH furnace are baked, the moisture content of the alloy is reduced, the moisture content of the alloy is smaller than or equal to 0.5%, and the moisture content of the raw and auxiliary materials is smaller than or equal to 1% according to the weight percentage; the alloy components are adjusted to be within an internal control range before the molten steel with the alloy components adjusted enters an RH furnace, it is guaranteed that component adjustment is reduced as much as possible in the RH vacuum treatment process so as to reduce the content of hydrogen brought into steel by the alloy, and multi-stage vacuum pump dynamic cooperative control is adopted for vacuum building. Argon consumption is reduced through flow reduction in the last stage, interference of temperature drop on the degassing process is avoided, and molten steel temperature fluctuation is smaller than or equal to + / -3 DEG C.
Need to check novelty before this filing date? Find Prior Art