A kind of preparation method of vanadium nitrogen alloy

Abstract

The invention relates to a preparation method of a vanadium-nitrogen alloy and belongs to the technical field of vanadium-nitrogen alloys. The method comprises the following steps: 1) a vanadium-nitrogen compound is smashed and uniformly mixed with a reducing agent, a nitrogen increasing agent and a catalyst in proportion, and the substances are stirred for 1.5-3 h; a binder and water are mixed uniformly in proportion; the two mixtures are mixed uniformly for standby application; 2) the finally obtained mixture in step 1) is pressed for the first time and subjected to second pressing forming under pressure higher than the first pressing pressure, a formed pressed product is naturally air-dried; 3) the pressed product air-dried in step 2) is subjected to drying, reduction, carbonization nitriding and nitrification sintering, and the vanadium-nitrogen alloy is obtained. Stirring time after raw materials are mixed with water can be shortened effectively, the binder is dissolved completelyand plays the binding role sufficiently, one-time pelletizing rate is increased, initial strength of pellets is improved, and curing effect is improved; surface quality and grade of vanadium-nitrogenare improved.

Description

technical field [0001] The invention relates to the technical field of vanadium-nitrogen alloys, in particular to a preparation method of vanadium-nitrogen alloys. Background technique [0002] Vanadium-nitrogen alloy, namely vanadium nitride, 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 effectively improve the strength, toughness, ductility and heat resistance of steel Comprehensive mechanical properties such as fatigue resistance, and make steel have good weldability. [0003] However, in the production process of vanadium-nitrogen alloys, the surface quality of vanadium-nitrogen alloys is often poor, cracks, adhesions, and the grade of vanadium-nitrogen alloys fluctuate greatly. For example, Chinese patent application CN103388101A discloses a vanadium-nitrogen microalloy additive and a preparation method, including: 1) grinding the vanadium compound through a mill; 2) mixin...

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Problems solved by technology

[0004] (1) The binder is added to the mixture in the form of solid particles, and then stirred with water, because the binder only accounts for 0.1-1.8 parts of the mixture (mass percentage is about 0.01%-0.2), due to the proportion of the binder If it is too small, it cannot be evenly mixed with the mixture; after adding water, in order to ensure that the added solid particle adhesive is fully dissolved, it is necessary to prolong the stirring time, which reduces the production efficiency

[0005] (2) Since the dissolved binder is difficult to distribute evenly in the mixture, the bonding can not achieve a good effect, the final ball forming rate is low, the initial strength of the ball is low, and the molding production efficiency is reduced. And because the initial strength is low, there are more scraps mixed in the balls, which prolongs the drying time of the balls (about 3-7 days)

[0006] (3) Due to the large number of scraps doped in the ball, the vanadium nitrogen alloy produced after drying, reduction, carbonization, nitriding, sintering and cooling has poor surface quality, cracks or adhesions, and large fluctuations in grade

[0007] In summary, there are still a series of problems in the preparation method of the vanadium-nitrogen microalloy in the above-mentioned prior art, so it is necessary to improve this to overcome the problems of the method

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