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 |