Nb-47Ti (NbTi) Bar, Rod & Billet – ASTM B884 Niobium-Titanium
ASC LLP, Mumbai, supplies Nb-47Ti (NbTi) niobium-titanium rod, bar and billet to ASTM B884. The alloy is 46–48% titanium, balance niobium, and is the standard superconducting alloy for MRI, NMR and accelerator magnet wire. It is also the stock from which Nb-47Ti fittings, adaptors and cryogenic components are machined. Material is supplied annealed, ultrasonic- and penetrant-tested, with EN 10204 3.1 certificates.
Which ASTM Standard Covers Nb-47Ti – B391, B393 or B884?
Nb-47Ti is covered by ASTM B884: niobium-titanium alloy billets, bar and rod for superconducting applications. The other niobium standards do not apply to Nb-Ti:
- ASTM B391 – niobium and niobium-zirconium ingots (R04200, R04210, R04251, R04261)
- ASTM B392 / B393 / B394 – niobium and Nb-1Zr bar, sheet / plate and tube
- ASTM B884 – Nb-47Ti billet, bar and rod (this page)
Nb-47Ti – Quick Facts
- Alloy: Nb-47Ti (Nb53Ti47, NbTi47), titanium 46–48 wt%
- Standard: ASTM B884
- Forms: rod, bar, billet; fittings and components machined to drawing
- Condition: annealed; average hardness below 170 HV
- Testing: chemistry, hardness, grain size, ultrasonic and liquid-penetrant examination
- Certificate: EN 10204 3.1
Nb-47Ti Bar, Rod & Billet Sizes
| Form | Size range (ASTM B884) | Typical use |
| Rod | Over 13 mm to under 60 mm (0.5 – 2.5 in) | Machined fittings, adaptors and small cryogenic parts |
| Bar | 60 mm to under 150 mm (2.5 – 6 in) | Larger machined components and wire-drawing stock |
| Billet | 150 mm (6 in) and over | Extrusion billets for multifilament superconducting wire |
Cut lengths and machined blanks on request. Material is supplied clean, with ends marked for heat traceability.
Nb-47Ti Fittings Machined from Bar & Rod
Nb-47Ti is not produced as large-bore pipe or butt-weld fittings. Nb-47Ti fittings are machined to drawing from B884 rod and bar:
- Adaptors, couplings and threaded connectors for cryogenic lines
- Flanged transitions, bushes and supports for magnet and cryostat assemblies
- Custom machined parts to customer drawing
For full details of machined parts see our Nb-47Ti fittings & components page.
Nb-47Ti Bar & Rod Specifications
| Item | Details |
| Product | Nb-47Ti niobium-titanium rod, bar and billet |
| Standard | ASTM B884 |
| Titanium content | 46 – 48 wt% |
| Condition | Annealed |
| Surface | Machined, ground or pickled |
| Testing | Chemistry incl. interstitials, hardness, grain size, ultrasonic and liquid-penetrant |
| Certificate | EN 10204 3.1; third-party inspection on request |
Nb-47Ti Chemical Composition (ASTM B884)
| Element | Limit (ASTM B884, ingot) |
| Titanium (Ti) | 46 – 48 % |
| Oxygen (O) | 1,000 ppm max |
| Tantalum (Ta) | 2,500 ppm max |
| Carbon (C) | 200 ppm max |
| Iron (Fe) | 200 ppm max |
| Nitrogen (N) | 150 ppm max |
| Aluminium (Al) | 100 ppm max |
| Chromium (Cr) | 100 ppm max |
| Copper (Cu) | 100 ppm max |
| Nickel (Ni) | 100 ppm max |
| Silicon (Si) | 100 ppm max |
| Hydrogen (H) | 45 ppm max |
| Niobium (Nb) | Balance |
Impurity limits are tight because inclusions and interstitials damage the fine filaments drawn from Nb-Ti for superconducting wire.
Quality Requirements for Nb-47Ti (ASTM B884)
| Requirement | ASTM B884 |
| Hardness | Average of three readings below 170 HV (DPH) |
| Grain size, 0.5 – 2 in diameter | ASTM 4.5 or finer |
| Grain size, over 2 – 4.5 in | ASTM 2.5 or finer |
| Grain size, over 4 – 6 in | ASTM 1.5 or finer |
| Internal soundness | Ultrasonic test – no defects above 3% of diameter or 2.5 mm equivalent |
| Surface | Liquid-penetrant test – no cracks or linear indications |
B884 controls softness, grain size and soundness rather than tensile strength, because the material must be drawn down to very fine wire without breaking.
Physical & Superconducting Properties of Nb-47Ti
| Property | Value (approx.) |
| Density | ≈ 6.0 g/cm³ (pure niobium 8.57 g/cm³) |
| Superconducting critical temperature (Tc) | ≈ 9 – 10 K |
| Upper critical field at 4.2 K | ≈ 10 – 11 T |
| Crystal structure | Body-centred cubic (β phase) |
| Low-temperature behaviour | Remains ductile and tough at 4.2 K |
| Magnetic (normal state) | Non-magnetic |
Applications of Nb-47Ti Bar & Rod
| Industry | Applications |
| Medical imaging | MRI and NMR magnet wire |
| Particle physics | Accelerator dipole and quadrupole magnets, detector magnets |
| Fusion & research | Poloidal-field coils, test and laboratory magnets |
| Cryogenic engineering | Machined adaptors, fittings and supports for liquid-helium systems |
| Industrial | Magnetic separation and high-field magnets |
Nb-47Ti is not an aerospace structural alloy; aerospace rivets use a different titanium-rich alloy, Ti-45Nb.
Related Niobium Pages
- Nb-47Ti fittings & machined components
- All niobium fittings
- R04200 pure niobium fittings and R04200 tube-formed fittings
- Nb-1Zr niobium fittings: tube-formed, plate-formed and bar-machined
- R04210 commercial-grade niobium fittings and R04210 tube fittings
- C-103 niobium alloy fittings
- Niobium & niobium alloys
Why Buy Nb-47Ti from ASC LLP?
- Correct specification: Nb-47Ti to ASTM B884 with 3.1 certificates showing titanium content, impurities, hardness and grain size.
- Rod to billet: machining rod, bar and extrusion billet, plus parts machined to drawing.
- Tested material: ultrasonic and penetrant examination per B884.
- Clean, protected export packing and worldwide shipment.
Send form, diameter, length, quantity and any drawing to sales@amardeepsteel.com or call 022-67439130.
Frequently Asked Questions – Nb-47Ti Bar, Rod & Billet
Which ASTM standard covers Nb-47Ti bar and rod?
ASTM B884 covers niobium-titanium alloy billets, bar and rod with 46–48% titanium for superconducting applications. ASTM B391 covers niobium and Nb-Zr ingots and ASTM B393 covers niobium sheet and plate – neither covers Nb-Ti.
What sizes of Nb-47Ti are covered by ASTM B884?
ASTM B884 defines rod as over 13 mm to under 60 mm diameter, bar as 60 mm to under 150 mm, and billet as 150 mm and over.
What hardness does ASTM B884 require?
The average of three hardness readings must be below 170 HV (DPH) in the annealed condition, together with grain-size, ultrasonic and liquid-penetrant requirements.
What is the density of Nb-47Ti?
Nb-47Ti has a density of about 6.0 g/cm³, much lower than pure niobium at 8.57 g/cm³, because of its high titanium content.
Are Nb-47Ti fittings available?
Yes, but they are machined to drawing from ASTM B884 rod and bar – mainly adaptors, couplings and cryogenic components. Nb-47Ti is not produced as standard butt-weld pipe fittings.
What is Nb-47Ti used for?
Mainly as superconducting wire for MRI, NMR and particle-accelerator magnets, and for machined components in liquid-helium cryogenic systems.
Global Reach
ASC LLP supplies niobium, niobium-titanium, tantalum and other refractory-metal products to research, medical and industrial customers worldwide, with secure packing and full documentation. Buyers in the USA, Europe, the Middle East and Asia rely on our Nb-47Ti bar and rod for certified quality and traceability.
Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.
