Ferrovanadium nitride alloy and preparation method thereof

Abstract

This invention is azotize ferro-vanadium and method for making same. The composition of azotize ferro-vanadium is: vanadium 47-81%, nitrogen 8-16%, iron 4-44%, carbon<=1%, silicon<=1.50%, aluminium<=0.01%, manganese<=0.50%, sulfur<=0.05%, phosphor<=0.05%; the method includes following steps: mixing powderedvanadium compound, carbonaceous reducer and ferrous powder, then adding agglomerant, briquetting, putting them into metallurgical furnace with protective atmosphere when they have been dry to do carbon thermal reduction, nitridation and sintered reaction, the temperature of carbon thermal reduction part is: 900-1200DEG C, the temperature of nitridation part is: 1200DEG C-1350 DEG C, the temperature of sintered reaction part is: 1350DEG C-1490DEG C, the total reaction time is: 2-18 hours. This invention simplifies traditional technique, greatly shortens reaction period, reduces the equipment input and cost of production, the obtained products is of stable quality, high vanadium yield, large density, low fusing point in steel application.

Description

technical field [0001] The invention belongs to the technical field of ferroalloy preparation, and in particular relates to a method for preparing ferrovanadium nitride alloy. Background technique [0002] The main use of vanadium is as an alloying element for smelting alloy steel. A large number of industrial-scale application data of vanadium-containing steel show that increasing the nitrogen content can increase the yield strength of the steel. Coarsening trend, after the addition of nitrogen in the steel, the precipitated phase particles become finer, so as to give full play to the strengthening effect of vanadium in the steel. In high-strength low-alloy steels, the use of ferrovanadium nitride can effectively strengthen and refine grains. Under the specified strength level, increasing nitrogen in steel can save vanadium consumption. Compared with ferrovanadium ferrovanadium, ferrovanadium nitride can save vanadium consumption as high as 15%-30%, and reduce steelmaking ...

AI Technical Summary

Problems solved by technology

The weak points of these methods have: the vanadium nitride density of method (1) is low, easily floats on the liquid steel surface, and the effective yield of vanadium is low and melting temperature is higher than iron vanadium, and it is difficult to add behind the furnace during smelting; method (2) The weak point of ) is that the yield of nitrogen is low and unstable; when adopting method (3), blowing nitrogen needs special device, and the yield of nitrogen is extremely low; The effective yield of vanadium is high, but the effective yield of vanadium is low when ferrovanadium nitride is prepared. It is necessary to first produce ferrovanadium and then crush, briquette, and vacuum solid-state nitriding to obtain ferrovanadium nitride. The preparation process is long and complicated. Production High cost, difficult to promote

The disadvantage of this patent is that the product density is low (generally 2.8-3.3 g / cm3), the liquid steel density is high during smelting, and it is inconvenient to add vanadium nitride, and the melting temperature of vanadium nitride in steel is about 160°C higher than that of ferrovanadium , also limited in composition fine-tuning and post-oven use

[0013] Ferrovanadium nitride has the advantages of both ferrovanadium and vanadium nitride, and avoids the shortcomings of the above two products. It is a very suitable vanadium nitrogen additive in iron and steel metallurgy, but the traditional preparation method of ferrovanadium nitride The effective yield of medium vanadium is low, the production process is complicated, the cycle is long, the cost is high, and the one-time investment of equipment is large, so it is difficult for industrial application