ASTM B392 Niobium Rod and Bar for Industrial, Medical and Superconducting Applications
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Niobium rods and bars are high-purity refractory metal products under ASTM B392 with excellent ductility, corrosion resistance, and superconducting performance. They are widely used in medical devices, nuclear systems, aerospace fasteners, and particle accelerators. With stable mechanical strength and low density, niobium round stock is ideal for extreme environments requiring high reliability, precision machining, and long service life in advanced industrial applications.
Description
ASTM B392 Niobium Rod & Bar | High-Purity Superconducting Industrial Metal
Niobium rods and bars are high-performance refractory metal materials manufactured under ASTM B392 standards.
They offer excellent corrosion resistance, high ductility, and stable performance in extreme environments.
With a melting point of 2,468°C, niobium maintains structural integrity even under high temperature and vacuum conditions.
Niobium round stock is widely used in superconducting systems, aerospace engineering, nuclear technology, and advanced electronics.
1. Size Classifications & Material Standards (ASTM B392)
Niobium wire, rod, and bar are classified according to diameter and industrial application requirements.
Niobium Wire
Diameter range: 0.51 mm to 3.15 mm.
Used for superconducting filaments and precision electronic components.
Niobium Rod
Diameter range: 3.18 mm to 63.50 mm.
Used for machining structural parts, aerospace fasteners, and vacuum components.
Niobium Bar
Diameter above 63.50 mm.
Used as forging stock for heavy industrial and nuclear applications.
2. Key Engineering Properties
Cryogenic Superconductivity
Niobium becomes superconducting below 9.2K, enabling zero electrical resistance.
High Ductility & Machinability
Niobium can be easily bent, drawn, and machined at room temperature without cracking.
Low Neutron Absorption
Ideal for nuclear applications due to its stable neutron transparency.
Biocompatibility
Niobium is non-toxic, non-magnetic, and suitable for medical implants.
3. Material Grades (ASTM B392)
| UNS Grade | Type | Application |
|---|---|---|
| R04200 | Pure Niobium | Chemical equipment, furnace parts, industrial components |
| R04210 | Commercial Niobium | General industrial and lighting applications |
| R04251 | Nb-1Zr Alloy | Nuclear reactors, high-temperature structural parts |
| R04220 | RRR High-Purity Niobium | Superconducting magnets, particle accelerators |
4. Industrial Applications
Superconducting Magnet Systems
Used in MRI machines, Maglev trains, and particle accelerators for high-field magnet generation.
Nuclear Engineering Components
Applied in reactor structures due to low neutron absorption and high radiation resistance.
High-Temperature Electronics
Used in lighting systems and vacuum electronics requiring stable thermal expansion behavior.
Aerospace Fasteners
Used in hypersonic and spacecraft structures where extreme heat resistance is required.
Video
FAQs
Is niobium difficult to machine?
Yes, niobium is soft but highly sticky, requiring sharp tools and proper cooling during machining.
What surface finish should I choose?
Choose ground finish for precision parts and as-rolled for heavy machining applications.
What testing is required?
Chemical analysis, tensile testing, and ultrasonic inspection are required for quality assurance.
Literature
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