Brief introduction of alloy Vanadium-nitrogen alloy is a new alloy additive, which can replace ferrovanadium in the production of microalloyed steel. Adding vanadium nitride to steel can improve the comprehensive mechanical properties of steel, such as strength, toughness, ductility and thermal fatigue resistance, and make steel have good weldability. Under the same strength, adding vanadium nitride can save 30-40% of vanadium addition, thus reducing the cost.
Taking the construction industry as an example, the new type of tertiary steel bar produced by vanadium-nitrogen alloying technology not only enhances the safety and seismic capacity of buildings, but also saves steel 10% ~ 15% compared with secondary steel bars. This alone can save about 7.5 million tons of steel bars, 6.5438+0.24 million tons of iron concentrate, 6.6 million tons of coal and 3.3 million tons of related auxiliary materials every year in China. At the same time, it can greatly reduce the emission of carbon dioxide, sulfur dioxide and other waste gases, and receive dual benefits of saving resources and protecting the environment.
Application of vanadium-nitrogen alloy
Vanadium-nitrogen alloy can be used in structural steel, tool steel, pipeline steel, steel bar and cast iron. The application of vanadium-nitrogen alloy in high strength low alloy steel can effectively microalloy vanadium and nitrogen at the same time, promote the precipitation of carbon, vanadium and nitrogen compounds in steel, and play a more effective role in precipitation strengthening and grain refinement.
Characteristics of vanadium-nitrogen alloy
Compared with ferrovanadium, it has a more effective role in strengthening and refining grains.
The addition amount of vanadium is saved. Under the same strength condition, vanadium nitrogen alloy can save 20-40% vanadium compared with vanadium iron alloy.
The yield of vanadium and nitrogen is stable, which reduces the performance fluctuation of steel.
Easy to use, less loss. Adopt high-strength moisture-proof packaging, which can be directly put into the furnace.
American Vanadium Company and China Panzhihua Iron and Steel Company.
Vanadium-nitrogen alloy is a cutting-edge technology in metallurgical industry, which is difficult to develop. At present, only VAMETCO and Panzhihua Iron and Steel Company can produce it in the United States. Through scientific research, Panzhihua Iron and Steel Co., Ltd. pioneered the advanced "non-vacuum continuous production" technology compared with foreign countries, which filled the gap in the production field of vanadium-nitrogen alloy in China.
1998, American Vanadium Company first introduced vanadium-nitrogen alloy to China. During the inspection at Panzhihua Iron and Steel Company, it was emphasized that "Germany, Russia and Japan have been studying vanadium-nitrogen alloys for more than 20 years, and all claimed to have developed their own production technology for vanadium-nitrogen alloys, but after more than 20 years, they have not been able to produce them in large quantities. There is a lot of knowledge in the production of vanadium-nitrogen alloy, and only we can really produce it commercially. " At the same time, I resolutely refused Panzhihua Iron and Steel's offer of technical cooperation and challenged "I will buy yours if you develop it". After years of research, from 65438 to1September 1996, Panzhihua Iron and Steel Co., Ltd. started the project "Study on Preparation of vanadium carbide and Vanadium Nitride with V2O3", and passed the acceptance of the national ninth five-year scientific and technological research project. After several years of hard exploration, the technical success of vanadium-nitrogen alloy industrialization has finally been achieved. The success of this technology in Pangang not only broke through the exclusive monopoly of the United States in the world, but also advanced in technology, reaching the international leading level, forming a patented technology with independent intellectual property rights. The industrialization technology of vanadium-nitrogen alloy in Panzhihua Iron and Steel Co., Ltd. exceeds the similar technology of Vametoco Company in the United States, mainly in the following aspects: First, Panzhihua Iron and Steel Co., Ltd. can produce in a non-vacuum environment instead of the high vacuum environment necessary for Vametoco Company, with simple equipment, low requirements, strong stability and less equipment investment; Secondly, Pangang can continuously produce, reduce energy consumption and significantly improve labor productivity; Thirdly, in Panzhihua Iron and Steel Company, carbonization and nitridation are carried out at the same time, with simple process flow and short operation period.
From 2002 to 2004, it took Panzhihua Iron and Steel Co., Ltd. three years to quickly reach the annual production capacity of 2000 tons of vanadium-nitrogen alloy. In June, 2002, the 300 t/a industrial test pusher kiln of Panzhihua Iron and Steel Company was completed and put into operation. In 2003, due to the breakthrough of key technology in 300 t/a industrial test, Panzhihua Iron and Steel Company decided to formally realize industrial production, and the industrialization project was supported by the state and listed as a national high-tech industrialization project. In August, 2003, the second and third sets of 300 t/a industrial plants in Panzhihua Iron and Steel Company were successively completed and put into operation, and the production capacity was expanded to1000 t/a; In June and July, 2004, three newly-built 300 t/a industrial plants were put into operation one after another, making the total production capacity of vanadium-nitrogen alloy in Panzhihua Iron and Steel Company reach 2000 t/a scale.