Negative-pressure bottom-blowing nitrogen increasing process method for P92 heat-resistant steel
By using bottom-blowing nitrogen under negative pressure in a VD furnace, the problems of high cost and environmental pollution in the nitrogen enrichment process of P92 heat-resistant steel have been solved. This process achieves efficient nitrogen dissolution and improved purity of molten steel, resulting in zero emissions.
CN121610618APending Publication Date: 2026-03-06INNER MONGOLIA NORTH HEAVY INDS GROUP
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Patent Information
- Application Number
- CN202511734324.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-24
- Publication Date
- 2026-03-06
AI Technical Summary
Technical Problem
The existing nitrogen-enhancing process for P92 heat-resistant steel has problems such as high cost, easy oxidation of molten steel and environmental pollution, especially when nitriding alloys and micro-positive pressure bottom blowing nitrogen technology are added in the traditional refining process.
Method used
The nitrogen enrichment process adopts bottom blowing nitrogen under negative pressure in VD furnace. By controlling the gas partial pressure and reaction conditions, the nitrogen dissolution in molten steel is ensured, avoiding violent reaction and steel oxidation, and achieving zero emissions.
Benefits of technology
This improved nitrogen yield and steel purity, reduced production costs, and achieved zero emissions of flue gas during the nitrogen alloying process.
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Figure CN121610618A_ABST
Abstract
The invention relates to a P92 heat-resistant steel negative pressure nitrogen bottom blowing nitrogen increasing process method which comprises the steps of electric arc furnace tapping, LF refining treatment, VD treatment and negative pressure nitrogen bottom blowing treatment in the smelting process, nitrogen bottom blowing is conducted in the VD furnace in the negative pressure state, the gas partial pressure is reduced, nitrogen is dissolved in molten steel more easily, and the purpose of increasing nitrogen in the molten steel is achieved; partial oxidation of molten steel caused by violent reaction or bottom blowing inert gas stirring in the nitrogen alloying process is avoided, the purity of the molten steel is improved, and dissolution and reaction of nitrogen in the molten steel are promoted by controlling the temperature of the molten steel, the nitrogen flow or the contact reaction area of nitrogen and the molten steel during nitrogen alloying and prolonging the reaction time and proper molten steel components; and the yield of nitrogen is stabilized, the components of molten steel are more uniform, the production cost is reduced, and zero emission of flue gas in the nitrogen alloying process of the P92 heat-resistant steel is realized.
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