The Steel-Plastic Lined Composite Pipe is a hybrid piping product manufactured by securely lining the inner wall of a metal steel pipe with a thermoplastic pipe. It innovatively combines the mechanical strength and pressure-bearing capacity of the outer metal pipe with the superior corrosion resistance, abrasion resistance, and fluid compatibility of the inner plastic liner. It is specifically engineered for conveying highly corrosive, abrasive, or ultra-pure media, overcoming the limitations of single-material pipes in demanding service conditions.