The iron and steel industry is an early field of gas industry application, and it is also a field of large gas demand. In recent years, iron and steel enterprises began to outsource the gas business, our company and the steel supply mode of continuous development. Our company not only considers the iron and steel Enterprise's own gas situation, but also need to take into account the local liquid market, so as to develop suitable product indicators for the local market, thus choosing the appropriate air separation process.