The manufacturing of stainless steel-lined pipe involves mechanically bonding a corrosion-resistant stainless steel liner inside a carbon or alloy steel outer pipe. The process begins with precision machining and cleaning of both the host pipe's interior and the liner's exterior. The liner, typically made of grades like 304 or 316L stainless steel, is then inserted.

The key bonding step is achieved through a controlled hydraulic expansion process, where high-pressure fluid radially expands the liner against the host pipe's inner wall, creating a permanent mechanical fit. The ends are then finished, often by welding, to create a sealed, hybrid pipe system that combines the structural strength and cost-effectiveness of carbon steel with the superior corrosion and contamination resistance of stainless steel for critical fluid transport.