Vanadium-nitrogen alloy

Alloy introduction Vanadium-nitrogen alloy is a new alloy additive that can replace ferrovanadium for the production of microalloyed steel. The addition of vanadium nitride to steel can improve the steel's comprehensive mechanical properties such as strength, toughness, ductility and thermal fatigue resistance, and make the steel have good weldability. To achieve the same strength, adding vanadium nitride saves 30-40% of the vanadium addition, thereby reducing costs.

Take the construction industry as an example. The new third-level steel bars produced using vanadium-nitrogen alloying technology not only enhance the safety and earthquake resistance of the building due to its increased strength, but are also more durable than those using second-level steel bars. Rebar saves 10-15% of steel. By this alone, our country can use about 7.5 million tons less steel bars every year, correspondingly reduce the mining of about 12.4 million tons of iron concentrate, save 6.6 million tons of coal, and save 3.3 million tons of related auxiliary raw materials. At the same time, it also significantly reduces carbon dioxide and sulfur dioxide. The emission of waste gas has the dual benefits of resource conservation and environmental protection.

Applications of vanadium-nitrogen alloys

Vanadium-nitrogen alloys can be used in structural steel, tool steel, pipe steel, steel bars and cast iron. When vanadium-nitrogen alloy is used in high-strength low-alloy steel, it can effectively micro-alloy vanadium and nitrogen at the same time, promote the precipitation of carbon, vanadium, and nitrogen compounds in the steel, and more effectively play the role of sedimentation strengthening and grain refinement.

Features of vanadium-nitrogen alloy

It is more effective in strengthening and refining grains than ferrovanadium

Save the amount of vanadium added, and vanadium-nitrogen can be used under the same strength conditions Compared with ferrovanadium, the alloy can save 20-40% of vanadium

The yield of vanadium and nitrogen is stable and the performance fluctuation of steel is reduced.

Easy to use and less loss. It is packed in high-strength moisture-proof packaging and can be put directly into the furnace.

American Vanadium Corporation and China's Panzhihua Iron and Steel Co.

The research and development of vanadium-nitrogen alloys is difficult and is the top cutting-edge technology in the metallurgical industry. At present, only the American VAMETCO company and Panzhihua Iron and Steel Co. in the world can produce it. Through scientific research, Panzhihua Iron and Steel Group pioneered the "non-vacuum continuous production" technology that is more advanced than foreign countries, filling the gap in China's vanadium-nitrogen alloy production field.

In 1998, the American Vanadium Company came to China for the first time to promote vanadium-nitrogen alloys. During an inspection of Panzhihua Iron and Steel Co., Ltd., it emphasized that "Germany, Russia, and Japan have all studied vanadium-nitrogen alloys for more than 20 years. They all claim to have developed vanadium-nitrogen alloy production technology, but they have not been able to mass-produce it for more than 20 years. There is a lot of knowledge in vanadium-nitrogen alloy production, and only we can truly produce it commercially." At the same time, he raised the issue of Panzhihua Iron and Steel Co., Ltd. We resolutely refused and challenged "you develop it and I will buy it from you". After years of research, in September 1996, Panzhihua Iron and Steel Co., Ltd. began to establish the project "Research on the Preparation of Vanadium Carbide and Vanadium Nitride Using V2O3" and passed the "Ninth Five-Year Plan" national science and technology project review. After that, after several years of arduous exploration, it finally achieved The industrialization technology of vanadium-nitrogen alloy was successful. The success of Panzhihua Iron and Steel's technology not only broke through the global exclusive monopoly of the United States, but also made the process technology more advanced and reached the international leading level, forming a patented technology with independent intellectual property rights. Panzhihua Iron and Steel Co., Ltd.'s vanadium-nitrogen alloy industrialization technology comprehensively surpasses the similar technology of Vametco Company in the United States. The main manifestations are as follows: First, Panzhihua Iron and Steel Co., Ltd. can produce in a non-vacuum environment instead of the high vacuum environment required by Vametco Company. The equipment is simple, lower requirements, and stable. It is strong and has low equipment investment; secondly, the Panzhihua Iron and Steel Process can produce continuously, reducing energy consumption and significantly improving labor productivity; thirdly, in the Panzhizhizhi Iron and Steel Processing Technology, the carbonization and nitridation reactions proceed simultaneously, the process flow is simple, and the operation cycle is short.

From 2002 to 2004, Pangang quickly reached an annual production capacity of 2,000 tons of vanadium-nitrogen alloy within three years.

In June 2002, Panzhihua Iron and Steel Co., Ltd. successfully built a 300t/a industrial test push plate kiln and put it into operation; in 2003, due to the breakthrough in key technologies of the 300t/a industrial test push plate kiln, Panzhihua Iron and Steel Co., Ltd. decided to formally realize industrialized production and industrialization. The project received state support and was listed as a national high-tech industrialization project; in August 2003, Panzhihua Iron and Steel Co., Ltd.'s second and third 300t/a industrial equipment were completed and put into operation, expanding the production capacity to 1,000t/a; in 2004 In June and July, three new 300t/a industrial equipment built by Panzhihua Iron and Steel Co., Ltd. were put into operation one after another, bringing the total production capacity of Panzhihua Iron and Steel Co., Ltd.'s vanadium-nitrogen alloy to 2,000t/a.