Method for treating oxidized vanadium-nitrogen alloy

Abstract

The invention relates to a method for treating an oxidized vanadium-nitrogen alloy and belongs to the technical field of vanadium-nitrogen alloys. The method actually comprises the steps that (1), a reducing agent, water and a binder are mixed in a ratio of 1 : (0.5-1) : 0.01, still placement is performed after uniform stirring is performed, and a mixed material slurry is obtained; (2), the vanadium-nitrogen alloy with the surface being discolored by oxidation is put in the mixed material slurry, sufficient stirring is performed to make the mixed material slurry be in sufficient contact with the vanadium-nitrogen alloy surface, and the vanadium-nitrogen alloy is taken out and redundant mixed materials on the surface of the vanadium-nitrogen alloy are dried; (3), the dried vanadium-nitrogenalloy in the step(2) is kneaded; and (4), the obtained vanadium-nitrogen alloy in the step(3) is dried in the air, the vanadium-nitrogen alloy dried in the air is placed on the upper layer of a vanadium-nitrogen semi-finished ball to be machined, then drying, carbonizing reduction and nitriding sintering are performed on the vanadium-nitrogen alloy in a protective gas atmosphere, and the treatedvanadium-nitrogen alloy is obtained. By means of the method for treating the oxidized vanadium-nitrogen alloy, only oxidized parts are treated, and the discolored vanadium-nitrogen alloy can be effectively restored to the normal color of the vanadium-nitrogen alloy.

Description

technical field [0001] The invention relates to the technical field of vanadium-nitrogen alloys, in particular to a method for treating oxidized 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 of vanadium-nitrogen alloys often appears to be oxidized. The main reasons are as follows: (1) The purity of nitrogen gas supplied cannot meet the requirements (the purity of nitrogen gas must be above 99.999%) , resulting in a trace amount of oxygen in the supplied nitrogen, which causes the surface oxidation of the van...

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Problems solved by technology

[0003] However, in the production process of vanadium-nitrogen alloys, the surface of vanadium-nitrogen alloys often appears to be oxidized. The main reasons are as follows: (1) The purity of nitrogen gas supplied cannot meet the requirements (the purity of nitrogen gas must be above 99.999%) , resulting in a trace amount of oxygen in the supplied nitrogen, which causes the surface oxidation of the vanadium-nitrogen alloy; (2) The pusher kiln cannot supply nitrogen gas due to equipment failure and other reasons; (3) The windows and components of the pusher kiln are not sealed. Yan et al. Air enters the kiln body and causes the vanadium-nitrogen alloy surface

The surface of the oxidized vanadium nitrogen alloy will become colored (such as figure 1 Shown), severe oxidation will turn black (such as figure 2 shown), and oxidation will greatly reduce the grade of vanadium and nitrogen in the vanadium-nitrogen alloy, making the vanadium-nitrogen alloy an unqualified product

[0004] In order to prevent the vanadium-nitrogen alloy oxidized into unqualified products from being wasted, these oxidized products are usually treated as unqualified products to reduce the price, or re-grinded and added to the vanadium raw material, and then crushed-ball-making- However, this method has the following two problems in actual use: (1) the above-mentioned process is not only complicated, but also needs to be purchased from additional crushing equipment; (2) due to the The hardness of the alloy is high, which makes it difficult to pulverize, the production cycle is long, and the cost is high; (3) when the oxidized vanadium nitrogen is re-reduced, nitrided, and sintered, the carbon content of the sintered vanadium nitrogen itself is already very low. , the remaining carbon content can no longer restore the oxidized part, so when the oxidized vanadium nitrogen alloy is re-reduced, nitrided and sintered, there is almost no change in the part that has changed color, and the grades of vanadium and nitrogen are hardly improved.

[0005] However, there is currently no simple and effective method for treating oxidized vanadium-nitrogen alloys, so it is necessary to study a simple, effective, and economical method for treating oxidized vanadium-nitrogen alloys, so as to restore the discolored vanadium-nitrogen alloys to normal vanadium The color of the nitrogen alloy, so that the grade of vanadium and nitrogen meet the quality requirements

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