Advantages Of Using Vanadium Nitrogen Alloy

Vanadium nitrogen alloy is a new type of alloy additive made of vanadium pentoxide, carbon powder, activator and other raw materials. It is a new type of alloy additive generated by reacting at a high temperature of 1500~1800℃ under normal pressure and nitrogen atmosphere protection. It can replace ferrovanadium in the production of microalloyed steel, and has the advantages of strong corrosion resistance, high hardness, high strength and good wear resistance. Vanadium nitride has two crystal structures, namely V3N and VN. V3N has a hexagonal crystal structure, extremely high hardness, microhardness of about 1900HV, and unmeasurable melting point; VN has a face-centered cubic crystal structure, microhardness of about 1520HV, and melting point of 2360℃.

The production process of vanadium-nitrogen alloy mainly includes carbon thermal reduction-nitridation method, electric arc furnace method, slag method, etc. Among them, the carbon thermal reduction-nitridation method uses carbon powder and vanadium pentoxide as raw materials, and through pressing and high-temperature heating, the oxygen in vanadium pentoxide is replaced by nitrogen, thereby obtaining vanadium-nitrogen alloy. This method is a traditional preparation method for vanadium-nitrogen alloy, and the reaction temperature needs to be strictly controlled to avoid the occurrence of product surface cracking. The key process equipment in the production process is a continuous atmosphere push plate high-temperature furnace, which uses electric heating elements such as silicon molybdenum rods to obtain heat sources.

The yield strength of rebar with 0.03%~0.06% vanadium-nitrogen alloy added can be increased from 335MPa to 400MPa. This strength jump reduces the amount of steel used under the same load by 15%~20%. The new three-grade steel bars produced using vanadium-nitrogen alloying technology not only enhance the safety and earthquake resistance of buildings, but also save steel. Vanadium-nitrogen alloy has a profound impact on the development of lightweight technology. After the chassis of new energy vehicles adopts high-strength steel containing vanadium-nitrogen alloy, the weight of a single piece is reduced while the collision safety is improved. After the gearbox gear is treated with vanadium-nitrogen alloy, the contact fatigue life and gear transmission efficiency are improved. By precisely controlling the vanadium-nitrogen content, the pipe can still maintain a high impact energy and a long hydrogen sulfide stress corrosion cracking time in harsh environments.

The carbonitride precipitation strengthening effect of vanadium-nitrogen alloy is significant. After heat treatment, the cold working die steel containing vanadium-nitrogen alloy can reach a hardness of 62~64HRC and improve wear resistance. After adding vanadium-nitrogen to the steel used for the nuclear power plant stabilizer, the high-temperature strength is improved and the design life is extended. The high-speed train bogie material is treated with vanadium-nitrogen microalloying to increase the fatigue limit, ensuring the safety of continuous operation.

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