Borium is a brand name for a tungsten carbide. The type of product is more properly called a tube rod or tube metal.
In tube rods, fine tungsten carbide particles are encased in a metal tube or rod made mostly of steel. This type of material must be welded to the shoe.
Composite or composite rods are used for similar purposes, but are a different kind of product. In composite rods, larger-sized tungsten carbide particles are bound together within a matrix. The matrix is…