The Stainless Steel-Plastic Lined Composite Pipe is a high-end composite pipe formed by lining the inner wall of high-grade thin-walled stainless steel pipe (e.g., 304, 316L) with food-grade or high-purity plastic (e.g., PE, PPR). It combines the strength and external corrosion resistance of stainless steel with the absolute isolation and anti-scaling advantages of a plastic liner, specifically designed for applications with extremely high requirements for water purity, hygiene, or medium sensitivity.