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

A method to make a tubular element to transfer abrasive materials such as concrete, inert materials or suchlike, wherein said tubular element comprises an external tubular component made of steel and an internal tubular component made of a material having a greater resistance to wear than that of the external tubular component, and wherein said external and internal tubular components are coaxial to a central axis, wherein the method comprises a first sub-step in which said external tubular component is made to rotate around said central axis at a determinate angular speed, and a second sub-step, simultaneous with said first sub-step, in which a material comprising chromium carbide, in a pure form or in the form of an alloy or mixture thereof, is cast into said external tubular component made to rotate, in a melted condition in order to make said internal tubular component.