First, electric furnace steel: one-third of the steel is added with other alloys, and three-quarters of the steel is added; Ladle blowing argon stirring. Blowing argon is forbidden to expose molten steel. Vanadium yield of 90-92%, nitrogen yield of 65%.
Second, converter steel: steel slag, strict control of the end of the oxidation of molten steel. When the steel is produced, the deoxidizer silicon manganese alloy and ferrosilicon alloy are added first, followed by vanadium-nitrogen alloy. Start adding at the time of steel output, finish adding at 3/4 of the time of steel output, ladle blowing argon stirring. And feed the aluminum wire, do not expose the molten steel when blowing argon. Vanadium yield of 90%, nitrogen yield of 60%.
Third, vacuum treatment of steel: vacuum treatment of steel, after vacuum treatment of deoxidation, add other alloys and then add vanadium-nitrogen alloy. Vanadium yield is 92-95%, nitrogen yield is 65-68%.
Fourth, wire feeding method: In order to strengthen the beneficial effect of nitrogen in vanadium-nitrogen alloy, Panzhihua Iron and Steel adopts wire feeding (referring to cored wire made of vanadium-nitrogen alloy, its TV content 50-60) method to add vanadium-nitrogen alloy before the LF electric heating furnace leaves the station; Must be added after Z and ladle blowing argon stirring, blowing argon is forbidden to bare steel. Then pouring on the steel platform: vanadium recovery rate of 80%, nitrogen recovery rate of 55%.
Fifth, the unified requirements used in the above methods: ladle and ladle must be baked well, and large ladle casting steel must be protected for pouring.
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