Cladded Pipe is a steel pipe having a metallurgically bonded corrosion-resistant alloy layer on its internal or external surface. The base material is carbon steel or low alloy steel. Clad pipes comply with the most stringent requirements of strength and corrosion resistance. The carbon steel outer pipe (backing steel or base metal) complies with the static requirements of strength and durability whereas the highly alloyed inside pipe provides protection against corrosion. As more and more pipelines are operated under highly corrosive conditions, the use of CRA cladded pipe is increasing in the pipeline industry, especially in offshore areas.

An internal layer of corrosion-resistant alloy material, known as a cladding material is economically suitable as the thinner layer enhances the corrosion-resistant abilities with increasing cost. Because of this, Cladded Pipe is extensively used in subsea pipelines and natural gas industries for conveying sour oil and gas, saltwater pipelines, water reinjection systems, process pipes in the chemical industry, saltwater pipes, Water injection pipelines, Interfield pipelines, Riser pipelines, Flow-lines, power plants, and marine applications.

An extensive range of stainless steel and non-ferrous alloy materials to suit the temperature requirements can be used as cladded pipe material. In normal industrial applications the following materials are found suitable as cladding materials:

• Stainless Steel SS 304, SS 316, SS 317, SS410
• Alloy Steel 254 SMO 904
• Incoloy alloy 825, Inconel alloy 59, Inconel alloy 625
• Hastelloy C-276
• Hastelloy C-22
• Hastelloy B3
• UNS N0 8825, UNS N06625, UNS N04400,
• Alloy 31
• AL6NX
• Alloy 20
• Monel alloy 400