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Niobium
Atomic Symbol : Nb Atomic Number : 41 Melting Point : 2468 oC Density : 8.8 g/cc
Niobium, also known as columbium, is a lustrous light gray ductile metallic element that resembles tantalum chemically. Niobium can be bent, spun, deep drawn, and formed at room temperature. Machining is somewhat more difficult. High speed tooling with a proper lubricant will allow machining of niobium. Characteristics The cold working properties of niobium are excellent. Because of its bcc crystal structure, niobium is a very ductile metal that can undergo cold reductions of more than 95% without failure. The metal can be easily forged, rolled or swaged directly from ingot at room temperature. Niobium is totally resistant to such highly corrosive media as wet or dry chlorine, bromine, saturated brines, ferric chloride, hydrogen sulfide, and sulfur dioxide as well as nitric and chromic acids. It is also resistant to sulfuric and hydrochloric acids within specific temperature and concentration limits. Gaseous atmospheres at high temperatures attack niobium rapidly, primarily by oxidation, although oxygen contents may be very low. Applications
Typical Analysis in ppm
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