Deoxidation method for high-nitrogen steel

Abstract

The invention belongs to the field of ferrous metallurgy, and in particular relates to a deoxidation method for high-nitrogen steel. The method is characterized in that the deoxidation process is carried out in a medium-frequency vacuum induction furnace; the suitable crucible comprises the components of 97.5%-99% of MgO, 0.5%-0.7% of SiO2, and 0.3%-2% of other components; the alloy components comprise 20%-21% of Cr, 6%-7% of Ni, 8%-10% of Mn, and the balance of Fe; the manner for increasing nitrogen in liquid steel adopts nitralloy, the alloy comprises chromium nitride or manganese nitride, and the nitrogen increasing process is carried out under the protection of nitrogen of 0.06MPa-0.08MPa; and aluminium is adopted as a deoxidant, and after aluminium is added, smelting process needs to be continued for 15-25 minutes. Compared with the deoxidation technology adopting a complex deoxidant comprising alkaline earth such as calcium, magnesium, barium and the like, the deoxidation method for high-nitrogen steel has the advantages that special requirements on smelting equipment is not needed; the deoxidant is cheap, does not need to be prepared specially, and can be added conveniently; and the smelting time is short, the deoxidation result is stable and reliable, residue of the deoxidation product is little, no harmful elements affecting the property of the steel are introduced, and the smelting cost is greatly lowered.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and particularly provides a method for deoxidizing high-nitrogen steel. Background technique [0002] Due to the excellent mechanical properties and corrosion resistance of high nitrogen steel, the research related to it has been continuously developed in the past decades. Nitrogen has been regarded as a harmful element until the last decade of the 20th century, when pickering in the United States considered nitrogen to be a particularly important element. Nitrogen is an element that exists in large quantities in the air. It has a wide range of sources and is cheap. Adding nitrogen to steel can partially replace the amount of nickel, thus saving resources. However, the development of high-nitrogen steel so far has proved that when high-nitrogen steel is produced on a large scale, the cost of raw materials saved by the use of nitrogen is not enough to offset the additional energy consumpt...

AI Technical Summary

Problems solved by technology

However, there are few literatures reporting the deoxidation process of high nitrogen steel smelted by vacuum induction furnace

According to the existing literature results, there is still room for further reduction of the total oxygen content of high nitrogen steel, and the stability of the deoxidation results needs to be further strengthened

Images