HangZhou Oxygen plant group. (hereinafter referred to as Hangyang) is currently the world’s largest manufacturer of air separation equipment. It is a high-tech enterprise with a national-level enterprise technology center. It is a major domestic equipment base for technical equipment. Since its establishment in 1950 and the design and manufacture of China’s first air separation plant in 1955, Hangyang has been leading the development of China’s air separation industry and providing world-class air separation equipment. In recent years, Hangyang has implemented the business strategy of “bringing cows to sell milk”, taking advantage of the company’s advantages in the design and manufacture of air separation equipment, vigorously entering the field of industrial gases, realizing the further extension of the industrial chain, and establishing 30 professional gas companies in China. At present, the company has developed into one of the most important industrial gas suppliers in China.