After several years of actual use of steel-lined PTFE pipelines, the factors that directly affect their service life and stability are temperature, pressure and media. Good materials and manufacturing methods are the quality assurance of steel-lined PTFE pipeline products. The steel-lined tetrafluoroethylene pipeline can resist the corrosion of a variety of chemical media (including concentrated nitric acid). The product can work for a long time at a temperature of 230°C-250°C. Steel polyvinylidene fluoride or other composite pipes have good corrosion resistance to halogens, halogenated hydrocarbons, strong oxidants, boiling acids, alkalis and various organic solvents, but they are not resistant to fuming sulfuric acid, hot sulfuric acid and nitric acid Corrosion to ketones, ketones, esters, amines and high temperature sulfonating agents above 90℃. Steel-lined PTFE pipelines are ideal pipelines for transporting high-temperature media (such as strong acids, strong alkalis, industrial salts and strong corrosive gases). They are widely used in petroleum, chemical, metallurgy, pharmaceutical, electric power, pesticide, mining, papermaking and other industrial fields. Steel-lined tetrafluoroethylene pipes are mainly made of polytetrafluoroethylene. It is a polymer of tetrafluoroethylene. Divided into PVDF, PTFE, PFA, FEP and other categories. The product has good temperature and corrosion resistance, and can withstand the corrosion of any medium. The color is white. It is usually used for lining PTFE pipes, valves, seals, rods, etc. FEP (F46) is polyperfluoroethylene propylene, transparent in color, and comparable to PTFE in corrosion resistance. It is usually used in fluorine-lined pumps or perfluorinated pumps. PFA tetrafluoroethylene-oxyvinyl ether copolymer F4F46=F50 is a fluoroplastic alloy , This material is also commonly used in fluoroplastic pumps. Both are used together to increase wear resistance. The steel-lined tetrafluoroethylene pipeline has changed the characteristic that the previous pipeline cannot be bent, and can withstand various concentrations of acid, alkali and salt. It can also be used to connect lower mechanical graphite and ceramic glass pipes, and can also be used as the feed and discharge pipes for tank trucks, storage tanks, containers or reactors. It is a commonly used pipe fitting in industry. The temperature is between -20 degrees and 180 degrees. It is used in pipelines to solve vibration, displacement, and emission problems, and to compensate for thermal expansion and contraction.