Technique for preparing high-nitrogen vanadium-nitrogen alloy

Abstract

The invention relates to a technique for preparing a high-nitrogen vanadium-nitrogen alloy, belonging to the technical field of metallurgy. The technique uses a self-propagating high-temperature synthesis process and comprises the following steps: by using coarse ammonium metavanadate as a raw material, mixing with a retardant, directly introducing hydrogen, and accelerating nitridation by using NH4<+> in NH4VO3 to implement nitriding at high temperature; and after the reaction is complete, cooling the high-nitrogen vanadium-nitrogen alloy in the graphite crucible by introducing nitrogen, taking out, and crushing into blocks. An exhaust valve is utilized to control synthesis pressure in the closed synthesis container so as to control the surface air cleft on the final product vanadium-nitrogen alloy; and thus, the product prepared by the combustion synthesis technique has high strength, is almost not crushed in the material transportation and use process, thereby lowering the attrition rate of the material. The synthetic product has the advantages of high compactness, high specific gravity (up to 6.5 g / cm<3>) and uniform nitrogen content distribution.

Description

technical field [0001] The invention relates to a process for preparing a high-nitrogen vanadium-nitrogen alloy, which belongs to the technical field of metallurgy. Background technique [0002] my country is the world's largest steel producer and also the world's largest steel consumer. However, low-carbon structural steel is the most used steel, accounting for about 70% of the steel usage. Therefore, improving the strength of ordinary carbon steel is an important direction to promote the technological progress of my country's steel industry and adjust the steel structure. The solution is to increase alloyed steel - add high nitrogen vanadium nitrogen alloy. Using vanadium-nitrogen alloying, no need to add other precious alloy elements, high-strength steel with a yield strength of 550-600Mpa can be obtained under general hot rolling conditions, so long products such as high-strength steel bars and steel plates (strips) , thick plate, thick-walled section steel, seamless s...

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Problems solved by technology

However, the nitrogen content in the synthetic product is only 9.0-17.0%, and there are problems such as low nitrogen content (≤17%), high content of impurities such as carbon, sulfur and silicon, which seriously affect the nitrogen addition and performance of steel.