Explanatory notes
… are known as borolites. (3) Zirconium , chromium, tungsten, etc. carbides with cobalt, nickel or niobium. … known as boral cermets. The heading covers cermets, whether unwrought or in the form of articles not elsewhere specified … and in missiles. They are also used in furnaces and metal foundries (e.g., as pots, spouts, tubes), in the manufacture …