Explanatory notes
… constituent usually consists of oxides, carbides, borides, etc. The metal component consists of a metal such as iron, … known as borolites. (3) Zirconium , chromium, tungsten, etc. carbides with cobalt, nickel or niobium. (4) Boron … tubes), in the manufacture of bearings, brake‑linings, etc. The heading excludes : (a) Cermets containing …