Niobium Supplier – Niobium & Niobium Alloy Plate, Bar, Pipe, Fittings, Flanges & Fasteners
ASC LLP, Mumbai, supplies niobium and niobium alloys – reactor-grade and commercial-grade niobium (R04200, R04210), Nb-1Zr (R04251, R04261) and C-103 niobium alloy – as plate, sheet, foil, bar, rod, wire, seamless and welded pipe and tube, fittings, flanges and fasteners, to ASTM B391–B394 with EN 10204 3.1 certificates, for customers worldwide.
What is Niobium?
Niobium (Nb, atomic number 41, formerly called columbium) is a soft, ductile refractory metal with a melting point of about 2,477 °C and a density of 8.57 g/cm³ – the lightest of the common refractory metals. It is highly resistant to most acids at moderate temperatures, easy to form and weld, and becomes superconducting below about 9.2 K, which makes it the base of NbTi and Nb₃Sn superconducting wire.
Two limits matter when choosing niobium: it oxidises in air above about 400 °C, so hot parts must run in vacuum or inert gas or be coated, and it is attacked by hydrofluoric acid, hot concentrated sulphuric acid and strong alkalis.
Key Properties of Niobium
- Melting point: ≈ 2,477 °C (4,491 °F)
- Density: 8.57 g/cm³ – about half that of tantalum
- Corrosion resistance: excellent in hydrochloric, nitric and most organic acids; not suitable for HF or strong alkalis
- Ductility: can be cold-rolled, deep-drawn and spun at room temperature
- Weldability: TIG or electron-beam welding in high-purity argon or vacuum
- Superconductivity: critical temperature ≈ 9.2 K (high-RRR grades for RF cavities)
- Biocompatibility: used in implants and medical devices
Niobium Grades We Supply
| Grade | UNS | Type (ASTM) | Main use |
| Reactor-grade unalloyed niobium | R04200 | Type 1 | Chemical equipment, superconducting and vacuum service, sputtering targets |
| Commercial-grade unalloyed niobium | R04210 | Type 2 | General corrosion-resistant parts and linings |
| Reactor-grade Nb-1Zr | R04251 | Type 3 | Nuclear, liquid-metal and high-temperature service |
| Commercial-grade Nb-1Zr | R04261 | Type 4 | High-temperature parts, sodium-vapour lamp components |
| RRR (high-purity) niobium | R04200 (high RRR) | – | Superconducting RF cavities and research hardware |
| C-103 (Nb-10Hf-1Ti) | R04295 | ASTM B652/B654/B655 | Rocket and thruster nozzles, high-temperature aerospace parts |
| Nb-47Ti | – | – | Superconducting wire and MRI magnets |
ASTM Specifications for Niobium
| Specification | Product form |
| ASTM B391 | Niobium and niobium alloy ingots |
| ASTM B392 | Niobium and niobium alloy bar, rod and wire |
| ASTM B393 | Niobium and niobium alloy strip, sheet and plate |
| ASTM B394 | Niobium and niobium alloy seamless and welded tubes |
| ASTM B652 / B654 / B655 | Niobium-hafnium alloy (C-103) ingot; sheet, strip and plate; bar, rod and wire |
Fittings, flanges and fasteners are machined or formed from material to these standards. Room-temperature minimums for annealed material: unalloyed niobium 125 MPa tensile / 73 MPa yield; Nb-1Zr 195 MPa / 125 MPa; C-103 370 MPa / 260 MPa.
Our Niobium Product Range
We supply niobium as plate, sheet, coil and foil; bar, rod and wire; seamless and welded pipe and tube; fittings (elbows, tees, reducers, stub ends, caps); flanges (weld neck, slip-on, blind, lap joint, threaded) and fasteners (bolts, nuts, screws, washers, studs) – in stock sizes or to drawing.
Niobium Product Directory – All Forms & Grades
Select a product form and grade to see full chemistry, mechanical properties, sizes and specifications.
Which Niobium Grade Should You Choose?
- Corrosion service (acids, chemical plant): unalloyed R04200 or R04210.
- Higher strength or nuclear / liquid-metal service: Nb-1Zr, R04251 or R04261.
- Load-bearing parts at high temperature (aerospace): C-103.
- Superconducting applications: high-RRR niobium or Nb-47Ti.
Inspection, Testing & Certification
Every niobium order is supplied with full traceability to the mill heat.
- Chemical analysis including interstitials (C, O, N, H)
- PMI (positive material identification)
- Tensile testing to the relevant ASTM standard
- Dimensional, surface and visual inspection
- Ultrasonic or eddy-current testing of tube on request
- EN 10204 3.1 certificates; third-party inspection on request
Applications of Niobium Products
Chemical Processing
Heat exchangers, condensers, reactor linings, thermowells and piping for hydrochloric, nitric and organic acids – often as a lower-cost alternative to tantalum.
Aerospace & Space
C-103 thruster and rocket nozzles, hot structures and fasteners; niobium parts for vacuum and inert-gas service.
Superconductors & Research
High-RRR niobium for superconducting RF cavities; Nb-47Ti for MRI and research magnets.
Nuclear & Energy
Nb-1Zr components for liquid-metal and high-temperature reactor systems.
Electronics & Vacuum
Sputtering targets, vacuum-furnace hot zones, high-pressure sodium lamp parts.
Medical
Implant and device components where biocompatibility is required.
Why Choose ASC LLP as Your Niobium Supplier?
- All grades in one place: R04200, R04210, R04251, R04261, RRR, C-103 and Nb-47Ti.
- All forms: plate, sheet, foil, bar, wire, pipe, tube, fittings, flanges and fasteners.
- Certified material: ASTM B391–B394 / B652–B655, EN 10204 3.1 certificates with interstitial analysis.
- Small and urgent orders: cut pieces, prototypes and stock sizes.
- Export-ready: secure packing and documentation for shipments worldwide.
Send grade, form, size and quantity to sales@amardeepsteel.com or call 022-67439130.
