These pipes and tubes are mainly used in the core components of synthetic ammonia and urea industries, raw materials obtained by the ESR, the production process in addition to pay attention to cleanliness than control, heat treatment focuses on aspects of control, domestic products are mainly dependent on imports. Our company produces the urea class stainless steel including  304Lmod, 316Lmod, S31050 ,all of them belong to the kind of super pure stainless steel, which is mainly to solve the selective corrosion problem of ferrite easily happened in the process of urea synthesis ammonia environment. Our company who is one of the largest domestic urea grade stainless steel tube production enterprises have more than 150 tons annual production. These products are strictly controlled in accordance with the standard production process in the manufacturing process, and excellent corrosion resistance indexes can be obtained through Huey experimental inspection. The customer has good feedback after using.