Two or more layers of tube made of two or more different materials. The cross section of clad pipe is mostly concentric rings made of different materials. From the perspective of composition materials, there are different steel composition, steel and non-ferrous metal composition, steel and plastics composition, such as non-alloy steel stainless steel, steel copper, steel titanium, steel plastics clad pipe, etc., which are widely used in chemical industry, nuclear industry, marine engineering, etc.
No classification at present.