R04200 -Type 1, Reactor giredhi inalloyed niobium;
R04210 -Type 2, Commercial giredhi isina kurongeka niobium;
R04251 -Type 3, Reactor giredhi niobium alloy ine 1% zirconium;
R04261 -Type 4, Commercial giredhi niobium alloy ine 1% zirconium;