Method for rapid preparation of vanadium-nitrogen alloy

Abstract

The invention discloses a method for rapid preparation of a vanadium-nitrogen alloy. The method comprises the following steps: S1, preparing ingredients: weighing and taking a vanadium pentoxide powder, a graphite powder, a sodium silicate aqueous solution and an iron powder for standby application; S2, pretreating: mixing evenly the above raw materials, pressing into oblate spheroids, and drying; S3, feeding: placing the dried oblate-spheroid material on a graphite material basket, sending into a vacuum furnace by a transfer device, sealing the vacuum furnace, and starting a vacuum pump; S4, carrying out vacuum nitridation sintering: allowing the temperature in the furnace to reach 1400-1500 DEG C in 5 hours, then stopping the vacuum pump, carrying out deep carbonation and nitridation reaction, and continuously filling nitrogen during the reaction; and S5, discharging: after vacuum treatment, continuing to fill the nitrogen, cutting off power, cooling the vacuum furnace, when the temperature is dropped to 190-210 DEG C, stopping supplying nitrogen, opening the furnace, and taking out the graphite material basket. The method has the advantages of simple operation, low production cost, accurate process control, fast preparation, low energy consumption, and stable product production; and the vanadium-nitrogen alloy prepared by the method is high in nitrogen content and low in impurity content.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for rapidly preparing vanadium-nitrogen alloys. Background technique [0002] Vanadium-nitrogen alloy is a new type of alloy additive that can replace ferro-vanadium for the production of micro-alloyed steel. Adding vanadium nitride to steel can improve the comprehensive mechanical properties of steel such as strength, toughness, ductility and thermal fatigue resistance. And the steel has good weldability, and the addition of vanadium nitride saves 30-40% of the added vanadium when the same strength is achieved, thereby reducing the cost. In recent years, due to the obvious technical and economic advantages of vanadium-nitrogen microalloying technology, vanadium-nitrogen microalloys have been used in high-strength steel bars, non-quenched and tempered steels, high-strength strips, CSP products, high-strength thick plates and thick-walled H-beams, It has b...

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Problems solved by technology

However, the methods for producing vanadium nitride in the prior art generally have the following disadvantages: slow reaction speed, long production cycle, low productivity, high energy consumption, complicated process, low reliability of equipment, poor controllability, and the product Low nitrogen content, the general nitrogen content is about 7-14%, it cannot be called high nitrogen vanadium nitride, the impurity content is high, and the carbon content is between 4-10%, which cannot meet the customer's requirements for low-carbon products