The future development trend of vanadium-nitrogen alloy industry
As a kind of steel additives, vanadium nitrogen alloy is widely used in grade III rebar, tool steel, high-end materials and cast iron such as railway transportation, bridge steel, military aerospace and so on. With the increasing demand for vanadium nitrogen alloys in the steel industry, the industry has shown the following development trends:
1. Improve the process level and ensure product quality
Although China has creatively realized the simultaneous recycling of iron, vanadium and titanium in vanadium titanomagnetite on a global scale, some key technical bottlenecks have not yet been broken, and the recovery of iron and titanium in off-surface ore and tailings still has great potential, and the recovery rate of vanadium and titanium in the traditional blast furnace converter process is low. In addition, although China is the world's second largest vanadium product production base and an important titanium raw material base, the development capacity of high-end vanadium titanium products and related new processes is still insufficient, and the core competitiveness of products is not strong.
In addition, although the production process of different vanadium nitrogen alloy production enterprises is similar, the raw material ratio, temperature and other indicators in the production process have a great impact on the conversion rate and quality of vanadium nitrogen alloy. At the same time, for downstream iron and steel smelting enterprises, the addition and mixing methods of vanadium-nitrogen alloy have a great impact on the comprehensive mechanical properties of steel such as strength, toughness, weldability, ductility and thermal fatigue resistance, as well as the uniformity of steel mechanical properties.
2. Reduce furnace loss
The kiln has been in a high temperature state for a long time, and the refractory materials are required to be high, and the refractory materials currently used have a short life, and the consumables cost a lot, and the replacement has a greater impact on the production. At present, there is a need for further research and development of new refractories to achieve efficient and continuous production by extending the life of furnace refractories. At the same time, through the research and development of better thermal insulation materials, the radiant heat and heat conduction of infrared heat can be effectively suppressed, heat loss can be reduced, and the energy consumption of furnaces and kilns can be indirectly reduced.
3. Automation of production process
Most of the domestic manufacturers of vanadium nitrogen alloy use more primitive artificial metering ingredients, which have a large amount of labor, vanadium pentoxide dust has a greater impact on the environment, and serious harm to the human body, and the error in the weighing process is large, resulting in serious product quality differentiation. In order to achieve consistent quality of vanadium nitrogen alloy and reduce environmental pollution and human injury, weighing and feeding will develop in the direction of high precision and automation.
4. The scope of use is expanded and high-end
At present, vanadium-nitrogen alloy in China is mainly used in grade III rebar (400MPa grade steel bar), but its application is still relatively limited. HRB335 has been eliminated in the national standards for construction steel in European and American countries, and steel bars above 400MPa are used, and gradually develop in the direction of 500MPa grade steel bars. China is accelerating the upgrading of construction steel, vigorously promoting the application of 400MPa grade steel bars, and making it the leading steel bar.
In addition, vanadium nitrogen alloy in Europe and the United States has a large number of special steel such as tool steel, with the gradual elimination and withdrawal of low-end excess capacity in China's steel industry, the demand for special steel and high-end steel will be expanded, and the demand for vanadium nitrogen alloy will be further expanded.
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