Niobium Stock
Stock Supplies
These sizes are in stock, subject to prior sale. We also supply other sizes and alloys as well. See additional material information below.
Size to Weight Calculatorsheet
- .005″ x 6″ x Coil”
- .010″ x 12″ x Coil”
- .015″ x 12″ x Coil”*
- .020″ x 12″ x Coil”
- .036″ x 12″ x Coil”
- .040″ x 11.5″ x R/L
- .060″ x 12″ x R/L*
- .125″ x 12″ x R/L*
*Out-of-stock items, please contact us for pricing and availability
plate
- .250″ x 12″ x R/L*
- .375″ x 12″ x R/L*
- .500″ x 12″ x R/L*
*Out-of-stock items, please contact us for pricing and availability
wire
- .005″ Dia x 100 ft*
- .010″ Dia x 100 ft*
- .015″ Dia x 100 ft*
- .020″ Dia x 100 ft*
- .025″ Dia x 100 ft*
- .030″ Dia x 100 ft*
- .040″ Dia x 100 ft*
- .050″ Dia x 100 ft*
- .060″ Dia x 100 ft*
- .080″ Dia x R/L Coil*
- .090″ Dia x R/L Coil*
- .125″ Dia x R/L Coil*
*Out-of-stock items, please contact us for pricing and availability
rod
- .125″ Dia x R/L*
- .156″ Dia x R/L
- .187″ Dia x R/L
- .250″ Dia x R/L*
- .281″ Dia x R/L
- .312″ Dia x R/L*
- .375″ Dia x R/L
- .500″ Dia x R/L
- .625″ Dia x R/L
- .750″ Dia x R/L*
- .875″ Dia x R/L*
- 1.000″ Dia x R/L
- 1.250″ Dia x R/L*
- 1.500″ Dia x R/L*
*Out-of-stock items, please contact us for pricing and availability
tubing
- .125″ OD x .015″ wall x R/L*
- .184″ OD x .020″ wall x R/L
- .250″ OD x .020″ wall x R/L*
- .312″ OD x .020″ wall x R/L*
- .375″ OD x .020″ wall x R/L*
- .500″ OD x .020″ wall x R/L*
- .625″ OD x .020″ wall x R/L*
- .750″ OD x .020″ wall x R/L*
- .875″ OD x .020″ wall x R/L*
*Out-of-stock items, please contact us for pricing and availability
Material Information
- ASTM B393 Type R04210 (Sheet, Plate)
- ASTM B392 Type R04210 (Wire, Rod)
- ASTM Certifications upon request
- No cutting fee for custom lengths
- Custom Sizes Available
- Custom Stocking Plans Available
Our Process
Niobium Facts
Niobium (also known as columbium), Atomic number 41 on the periodic table, is a greyish-silvery metal. It is a transition metal found in group 5 & period 5 on the periodic table. A fairly dense & ductile element, Niobium is similar to tantalum and found just above it on the periodic table. In fact, both niobium and tantalum are found together in the mineral columbite. Thanks to an oxide layer that forms on its surface, Niobium is very resistant to corrosion. And like tantalum, it is inert to bodily fluids. Due to its unique attributes, Niobium is the refractory metal of choice for a wide variety of interesting applications.
Superconductors:
Niobium is a superconductor. It boasts the largest magnetic penetration depth of all the known elements. Alloyed with titanium, the Niobium-Titanium alloy is superconducting at temperatures below ten Kelvin and can be found in superconducting magnets in hospital MRI equipment & several large superconducting magnets (the Tevatron accelerator at Fermilab & the large Hadron Collider).
Medical Diagnostic Equipment:
Niobium is found in the superconducting magnets used in Magnetic Resonance Imaging (MRI) scanners and Nuclear Magnetic Resonance (NMR) medical diagnostic equipment.
Aerospace & Military Industry:
Alloyed with other metals, the resulting high temperature-stable superalloys are used in jet engine afterburner liners, as burst disks for wind tunnels, reaction control nozzles for missiles and control nozzles for satellites. The niobium alloy also resists high frequency vibrations at cryogenic temperatures, which occurs in many satellite applications.
Oil & Gas Pipelines:
In amounts as low as 0.1 per cent, Niobium increases the strength of the resulting alloys, particularly at low temperatures. It also improves the alloy’s corrosion resistance, making it an ideal candidate for use in oil rigs and oil & gas pipelines.
Niobium Types:
Rembar offers several types of Niobium:
Pure Niobium (commercially pure, min. 99.95%)
Niobium-1% Zr: regarded as a low-strength alloy.
C-103 (89% Nb, 10% Hf,1% Ti): regarded as a medium-strength alloy.
Technical Information
Niobium is a rare, soft, malleable, ductile, gray-white metal. It has a body-centered cubic crystalline structure and in its physical and chemical properties it resembles tantalum.
Atomic Weight: 92.9064
Density: 8.57 g/CC
Melting Point: 2750 K, 2468°C, 4490°F
Boiling Point: 5017 K, 4927°C, 8571°F
Coefficient of Thermal Expansion: (20°C) 7.1 x 10-6/°C
Electrical Resistivity: (20°C) 15 microhms-cm
Electrical Conductivity: 13.2% IACS
Specific Heat: .126 cal/g/°C
Thermal Conductivity: .523 cal/cm2/cm°C/sec
Crystal Structure: bcc
Thermal Neutron Cross Section: 1.1 b
The corrosion resistance of niobium is more limited than tantalum and this must be taken into consideration. The limitation stems from its sensitivity to most alkalis and certain strong oxidants.
However, 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.
Niobium is also resistant to attack by many liquid metals such as: Li <1000°C, Na, K + NaK <1000°C, ThMg <850°C, U <1400°C, Zn <450°C, Pb <850°C, Bi <500°C and Hg <600°C.
Niobium has the ability to form stable, passive oxides and therefore, it can provide unique solutions to many corrosion problems. However, niobium cannot be used in air at temperatures exceeding 200°C. Refer to the table entitled Corrosion Resistance for additional information.
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.
Annealing is necessary after the cross-sectional area has been reduced by approximately 90%. Heat treating at 1200° C for one hour causes complete recrystallization of material cold worked over 50%. Note that the annealing process must be performed either in an inert gas or in a high vacuum at pressures below 1 X 10-4 Torr. Of the two methods, the use of a vacuum is preferred.
Niobium is well suited to deep drawing. The metal may be cupped and drawn to tube but special care must be taken with lubrication. Sheet metal can also easily be formed by general sheet metal working techniques. The low rate of work-hardening reduces springback and facilitates these operations.