[en] Superconducting high purity niobium is important for particle accelerators in a variety of applications. Critical to the performance of superconducting accelerator devices is the quality of industrially produced niobium sheet, both in terms of low interstitial content as well as freedom from harmful chemical inclusions. At the present time Nb is the only superconductor metal of the second kind with higher critical magnetic field, reasonably high critical temperature Tc and Residual Resistance Ratio, good thermal conductivity and formability, hence of practical importance in the field of super conductivity. Three niobium-based materials make up the entire present portfolio of superconducting technology for accelerators: pure Nb metal, Nb-Ti and Nb₃Sn. This article covers details of the process developed at NFC for production of Nb sheets through multiple EB Refining of thermit–Extrusion– Rolling etc covering specific achievements, practical aspects and technological challenges in production and characterization. Achievement of the full potential of r.f. superconductivity is closely tied to further advances in Nb quality. Efforts are being put to fine tune the process parameters towards advances in quality