Material Introduction

Niobium and Niobium Alloys

Material Introduction

Niobium products include pure niobium metal and niobium alloys formed by adding other alloying elements to pure niobium, usually niobium-zirconium alloys. Pure niobium metal is gray-white, with a melting point of 2,468°C and a density of 8.57 g/cm3. It is paramagnetic and highly ductile, and is also superconducting at low temperatures. Niobium is stable in air at room temperature, and can directly combine with sulfur, nitrogen, and carbon at high temperature; it is also able to form alloys with titanium, zirconium, hafnium, and tungsten. It does not interact with inorganic acids or alkalis, nor is it soluble for use in chloroazotic acid, but it is soluble in hydrofluoric acid. Niobium and niobium alloy related products are widely used in aerospace, lighting, metallurgical additives, semiconductors and integrated optoelectronic components, and in other fields.


Chemical symbol Nb
CAS No. 7440-03-1
Lattice structure Body centered cubic
Atomic number 41
Relative atomic mass/g/mol/g·mol-1 92.91
Density/g·cm-3 8.57
Melting point/°C 2468
Boiling point/°C 4742
Thermal conductivity (20°C) /W·(m·K)-1 53.7
Linear expansion coefficient (20°C) /K-1 7.08x10-6
Conductivity (20°C) /S·m-1 5.0x106
Resistivity(20°C)/Ω·mm2·m-1 0.125
Specific heat (20℃)/J/g·K  0.26



Specifications and Performance

Related products


Related products

Niobium rod

≤Φ 140

ASTM B392-98


Outer /mm

Wall thickness/mm


Niobium Tube

Φ 8~38


ASTM B394-98




Niobium plate

≥Φ 0.2

ASTM B393-98




Niobium wire

≥Φ 0.5

ASTM B392-98

Fabrication Process

The internal structure and mechanical properties of the niobium metal prepared by the electron beam melting process can meet the requirements after being processed and deformed by forging and rolling.




Compared with tungsten and molybdenum materials, niobium materials have better ductility and corrosion resistance, and can be formed at room temperature. Can be used as iron and steel metallurgical additives to increase the high temperature strength of steel and improve its processing performance. Compared with other refractory metals, niobium also exhibits superconducting properties at low temperatures, thus expanding its application range.