We are specialists in semi-finished steel and metal products, as well as standard parts. We have a wide range of products in our large warehouse located in Europe which is constantly growing and is designed according to high quality standards.
We sell all over Europe, niobium and other refractory metals. We ship within 24 hours for whole Europe. Fast and uncomplicated deliveries.
We sell countless flat, round and square steels and precision tools with various dimensions and profiles.
Purchase refractory metals such as rhenium, molybdenum, copper, brass, bronze, aluminum, osmium, ruthenium, iridium, rhodium, palladium, tantalum, titanium, platinum, nickel alloys, pure tungsten, niobium, silver and composite metals and gold.
We work together with more than 10,000 clients from the mechanical engineering, tool manufacturing, mold manufacturing, cabinet construction, factory building and metal structures industries.
The niobium has a very high melting temperature and is not damaged by acids at room temperature.
It has a layer of oxide and is similar to tantalum. However, it has a much lower density.
The niobium can be worked very well.
We can manufacture for the following forms:
Drawing parts (in 3D data);
Round and flat bars;
Sheets / strips / tapes;
Atomic Number: 41
Atomic Weight: 92.90638
Element Category: transition metal
Group, period, block: 5, 5, d
Color: metallic silver-white / gray
Other names: Niob, Niobio, Nióbio.
Melting point: 2477 ° C, 4491 ° F, 2750 K
Boiling point: 4744 ° C, 8571 ° F, 5017 K
Density: 8.57 g · cm3
Density @ 20øC: 8.57 g / cm 3
Solid Density: 8570 kg · m3
Specific Heat: 0.27 (kJ / kg K)
Superconductivity Temperature: 9.25 [-263.9 ° C (-443 ° F)] K
Heat of Melting (kJ · mol-1): 27.2
Heat of Vaporization (kJ · mol-1): 680.19
Heat of Atomization (kJ · mol-1): 722,819
Thermal Conductivity: 53.7 W · m-1 · K-1
Thermal Expansion: 7.3 μm / (m · K)
Electrical Resistivity: (0 ° C) 152 n · m
Young's modulus: 105 GPa
Shear modulus: 38 GPa
Bulk module: 170 GPa
Poisson Index: 0.4
Hardness of Mohs: 6
Vickers Hardness: 1320 MPa
Brinell Hardness: 736 MPa
Sound velocity: (20 ° C) 3480 m · s-1
Pauling's electronegativity: 1.6
Sanderson's electronegativity: 1.42
Allred Rochow Electronegativity: 1.23
Mulliken-Jaffe's Electronegativity: N / A
Pauling's Electropositivity: 2.4
Electronic configuration: [Kr] 4d4 5s1
Atomic radius: 146 p.m.
Atomic radius, unbound (Å): 2.18
Covalent Ray: 164 ± 18:00
Covalent Ray (Å): 1.56
Ray Van der Waals: 200 pm
Oxidation states: 5, 4, 3, 2, -1 (slightly acidic oxide)
Crystalline structure: centered on the cubic body
Magnetic ordering: paramagnetic
Electronic affinity (kJ · mol-1) 88,381
1st Ionization Energy: 652,13 kJ · mol-1
2nd Ionization Energy: 1381.68 kJ · mol-1
3rd Ionization Energy: 2416.01 kJ · mol-1