Tubular element to transfer abrasive materials, in particular concrete, and method to manufacture it

A method to manufacture a tubular element for transferring abrasive materials, wherein said tubular element comprises an internal tubular component and an external tubular component in contact with each other and coaxial to a central axis (X), the method comprising:

• a first step in which said internal tubular component is made of a material comprising chromium carbide, in pure form or in a form of an alloy or a mixture thereof, said first step being achieved by centrifugation, using a substantially cylindrical mold rotating around a mold axis of rotation coincident with said central axis (X), and by casting the material comprising chromium carbide inside said mold, and
• a second step, after said first step, in which, in contact with an external surface of said internal tubular component, said external tubular component is made of a composite material in fibers impregnated with a resin,
• wherein during said first step and while said casting, a connection flange is made at one or both ends of a central part of said internal tubular component.