Niobium

Niobium

Niobium, formerly columbium, is a chemical element with symbol Nb (formerly Cb) and atomic number 41. It is a soft, grey, ductile transition metal, which is often found in the pyrochlore mineral, the main commercial source for niobium, and columbite. The name comes from Greek mythology: Niobe, daughter of Tantalus.

Niobium has physical and chemical properties similar to those of the element tantalum, and the two are therefore difficult to distinguish.

We EXPORT, SUPPLY & STOCK the following Grades of Niobium in form of pipes, tubes, sheets, bars, rods, wire &fabricated product like heat exchanger, pressure vessel, column & towers, etc.:

Chemical Composition
CAS number 7440-03-1
Thermal neutron cross section 1.1 barns/atom
Ionic radius 0.7 Å
Electro negativity 1.6
Electrochemical equivalent 0.0693 g/A/h
Physical Data
Properties Metric Imperial
Density 8.4 g/cm3 0.303 lb/in3
Melting point 2410 °C 4370 °F
Boiling point 5100 °C 9212°F
Mechanical Properties
Properties Metric Imperial
Tensile strength (at room temperature) 275 MPa 40 ksi
Modulus of elasticity 105 GPa 15250 ksi
Shear modulus 38 GPa 5511 ksi
Poissons Ratio 0.4 0.4
Hardness, Brinell 736 736
Hardness, Vickers 1320 1320
Hardness, Mohs 6 6