Plastic-lined steel pipes and fittings for chemical plants are steel pipes on the outside, but inside they utilize thermoplastic materials. These pipes have the general functions of steel pipes, with some enhancements. In fact, this plastic-lined steel plate is very effective when transporting oily substances. After being lined with PTFE, the corrosion resistance of the steel pipe is significantly improved. Plastic-lined steel pipes and fittings for chemical plants can essentially transport all types of chemicals. PTFE-lined steel pipes use polytetrafluoroethylene as the lining material, offering excellent high and low-temperature resistance. Functionally, media within the temperature range of -100℃ to -250℃ can be transported through these pipes.