Niobium is used mostly in alloys, the largest part in special steel such as that used in gas pipelines. The temperature stability of niobium-containing superalloys is important for its use in jet and rocket engines. Niobium is used in various superconducting materials. widely used in the superconducting magnets of MRI scanners. Other applications of niobium include welding, nuclear industries, electronics, optics, numismatics, and jewelry. Niobium is considered a technology-critical element.