The inner clad composite steel pipe is a bimetallic composite pipe with high-strength carbon steel or low-alloy line pipe steel as the base material, and a uniform layer of stainless steel, duplex steel, or nickel-based corrosion-resistant alloy cladding on the inner wall. It features corrosion resistance on the inner wall and pressure bearing on the outer wall. Through the metallurgical bonding process, the base and cladding achieve atomic-level firm bonding, with no gaps, no delamination, corrosion resistance and high pressure resistance. It is a new generation of high-end anti-corrosion and pressure-resistant pipeline products replacing pure alloy steel pipes, and surfacing pipe fittings.

Outer Base Layer (Pressure-bearing Layer): Adopts carbon steel/line pipe steel such as 20#, Q355B, L245(Gr B), L360(Gr X52), L415(Gr X60),L450(Gr X65), A106B, A53, which bears pipeline pressure, stiffness, strength, welding and external loads, with excellent mechanical properties, and can meet the requirements of high temperature, high pressure and long-distance transportation.

Inner Cladding Layer (Corrosion-resistant Layer): The inner wall is clad with corrosion-resistant materials such as 304, 316L, 2205, 2507 duplex steel, 825, 625 nickel-based alloy, which directly contacts corrosive media and resists corrosion from CO₂, H₂S, chloride ions, acids, alkalis, salts, seawater, oilfield produced water, etc.

Bonding Interface: Metallurgical fusion bonding, not mechanical interference, glue bonding, or surfacing superposition; high bonding strength, resistance to thermal expansion and contraction, vibration, and pressure impact, no gap corrosion, no delamination and detachment, and no leakage hidden dangers.