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, comprising:

• providing an external tubular component made of steel;
• rotating the external tubular component around a central axis at a determinate angular speed;
• simultaneously casting a material comprising chromium carbide, in a pure form or in the form of an alloy or mixture thereof, into said rotating external tubular component, in a melted condition in order to mold in-situ an internal tubular component;
• wherein the internal tubular component is made of a material having a greater resistance to wear than that of the external tubular component,
• wherein said external and internal tubular components are formed coaxial to the central axis;
• and
• wherein the external tubular component delimits a centrifugal mold for molding the internal tubular component.