Nitrogen increasing control method and preparation method of high-nitrogen-silicon deoxidized steel and high-nitrogen-silicon deoxidized steel

• Main Authors: DAI ZHICAI, CHAUAIDA, LIU PENG, XU HAO, HUANG FENG, MAO YUN, LI HUABING, LIANG WEN, QIU GUOXING, JIANG ZHOUHUA, LI YANG, ZENG BIN, LIANG LIANG, XU GUANG, SUI YAFEI
• Format: Patent
• Language: Chinese; English
• Published: 20.08.2024
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention provides a nitrogen increasing control method and a preparation method of high-nitrogen silicon deoxidized steel and the high-nitrogen silicon deoxidized steel. The nitrogen increasing control method comprises the following steps that under the conditions that the temperature of molten steel is 30-40 DEG C higher than the liquidus temperature and the oxygen content is 20-40 ppm, nitrogen is blown into the molten steel in a bottom blowing mode in the molten steel refining process under the conditions that the first pressure and the first flow are maintained, and target molten steel is obtained; wherein the first pressure is selected from 1 Mpa to 1.5 Mpa, and the first flow is selected from 2000 L/min to 2500 L/min. According to the method for controlling the nitrogen increasing rate of the high-nitrogen silicon deoxidized steel, the temperature and the oxygen content of the molten steel are accurately controlled, and the composition of the molten steel is adjusted, so that the influence of other