Stainless steel lined with PTFE is a composite material, consisting of a steel substrate and a PTFE lining. It combines the high strength of steel with the excellent corrosion resistance and low friction coefficient of PTFE, enabling it to operate in environments ranging from -100℃ to 250℃ for extended periods. It withstands erosion from various chemical media and is suitable for industries such as chemicals and food processing, where it is used to convey corrosive fluids.