Method for increasing nitrogen content in powdery vanadium-nitrogen alloy

Abstract

The invention discloses a method for increasing the nitrogen content in powdery vanadium-nitrogen alloy. The method comprises the following steps that firstly, the vanadium-nitrogen alloy meeting the national standard and with the nitrogen content smaller than 18% and larger than or equal to 14% is made into raw material powder with the particle size smaller than 100 meshes, and vanadium-nitrogen alloy raw material powder is obtained; secondly, a modifier vinyltriethoxysilane and graphene oxide are added into the vanadium-nitrogen alloy raw material powder, ultrasonic treatment is conducted, then spray drying is conducted in the nitrogen atmosphere, and modified vanadium-nitrogen alloy powder is obtained; and thirdly, the modified vanadium-nitrogen alloy powder is subjected to temperature programming, heat preservation, sintering and nitrogen fixation in the nitrogen atmosphere, then temperature programming is conducted, and the powdery vanadium-nitrogen alloy is obtained. According to the method for increasing the nitrogen content in the powdery vanadium-nitrogen alloy, the nitrogen content in the prepared vanadium-nitrogen alloy with the nitrogen content larger than or equal to 14% and smaller than 18% is remarkably increased, the nitrogen content can reach 19%-21%, the national standard is met, and the nitrogen content of the produced product is stable.

Description

technical field [0001] The invention relates to a method for increasing nitrogen content in powdered vanadium-nitrogen alloy, which belongs to the technical field of metal additives. Background technique [0002] Vanadium-nitrogen alloy is a new alloy additive that can replace ferrovanadium for the production of microalloyed steel. The new three-level and above vanadium-containing steel bars produced by vanadium-nitrogen alloy (vanadium nitride) technology, because of their increased strength, not only enhance the safety and earthquake resistance of buildings, but also save 10% compared with the use of second-level steel bars ~15% steel. At the same time, the vanadium-nitrogen alloy has more effective strengthening and grain refinement effects than the vanadium-iron alloy, and saves the amount of vanadium added. Under the same strength condition, the vanadium-nitrogen alloy can save 20-40% of vanadium compared with the vanadium-iron alloy. [0003] At present, most of the ...

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Problems solved by technology

[0003] At present, most of the existing processes can only produce VN16 vanadium-nitrogen alloy products that meet the national standard GB / T20567-2006, and it is difficult to produce VN18 vanadium-nitrogen alloys

Using the pusher kiln process, due to the high sintering temperature, severe shrinkage, large grain size, nitrogen is no longer easy to combine, even if the carbon content is low, the reaction is difficult to proceed, resulting in high oxygen content in the product, and the nitrogen content cannot reach 18%. Above; using high-temperature and high-vacuum resistance sintering furnace production process, due to the relatively large shrinkage of the product, the grain becomes larger, and nitrogen is no longer easy to combine, even if the carbon content of C is low, the reaction is difficult to proceed, resulting in high oxygen content in the product, nitrogen content can not reach more than 18%