With the vigorous development of Chinese metallurgical industry, the demand for industrial oxygen is also growing, and the demand for metallurgical air separation plant is gradually increasing. New technologies, new processes, new equipment and new materials are emerging in the iron and steel industry, which is also a major opportunity for the air separation industry. The demand for air separation products in the iron and steel industry is becoming more and more diversified. From the original demand for oxygen, it has gradually expanded to high-purity nitrogen, argon and other rare gases. The selection of metallurgical air separation plant depends on the production needs, customer preferences, equipment energy consumption, investment and other comprehensive factors.