Pure Niobium Rods/Niobium Wires: Specialized Solutions for Industrial & Laboratory Applications

Pure niobium rods/wires of R04200 grade are rod and wire products manufactured from high-purity commercially pure niobium (Nb content ≥ 99.95%, complying with ASTM R04200 and high-purity Nb1 grade) through multiple processes including vacuum melting, forging, hot rolling, drawing, and annealing. Generally, products with a diameter of ≥1.0mm are classified as rods, while those with a diameter of ≤1.0mm are wires. They are mainly used in scenarios such as high-temperature electrodes, aerospace precision components, chemical corrosion-resistant connectors, laboratory-specific probes, superconducting material conductors, and medical device wires. As an important category of high-purity niobium-based materials, they possess outstanding high-temperature stability (capable of long-term stable operation below 1200℃ and short-term resistance to 1600℃), excellent corrosion resistance (strong tolerance to most acids, alkalis, molten salts, and high-temperature gases, excluding hydrofluoric acid), as well as ultra-pure impurity-free properties, excellent ductility, and prominent electrical conductivity. These characteristics make them key materials in fields requiring high material purity, structural strength, electrical conductivity, and environmental resistance, especially suitable for high-precision, fine-specification, and extreme-condition functional applications.

Product specification

Product Parameters

Product Information

Item	Regular Specifications (Pure Niobium Wires)	Regular Specifications (Pure Niobium Rods)	Customization Range
Diameter	0.3mm—1.0mm	1.0mm—20mm	0.2mm—100mm, customizable per customer requirements
Length	1000mm—5000mm (single piece); 50m—1000m (coiled)	500mm—6000mm (single piece), cut-to-length available on demand	Customizable on demand (both single pieces and coiled wires available, maximum length up to 8000mm)
Tolerance Range	Diameter tolerance: ±0.001mm—±0.005mm (fine specifications); ±0.005mm—±0.01mm (regular specifications) (compliant with ASTM B394 standard)	Diameter tolerance: ±0.01mm—±0.1mm (fine rods); ±0.1mm—±0.3mm (thick rods) (compliant with ASTM B394 standard)	Tolerance customizable per customer precision requirements, up to precision-grade tolerance
Surface Roughness	Polished surface: Ra≤0.2μm; Bright annealed surface: Ra≤0.8μm	Polished surface: Ra≤0.4μm; Bright annealed surface: Ra≤1.0μm	Surface roughness customizable on demand to meet precision assembly requirements

Product Name	Pure Niobium Rods, Pure Niobium Wires
Brand Name	Yunjie
Model	R04200 (ASTM Standard)
Material	High-Purity Niobium (Commercially pure niobium, complying with ASTM R04200 grade)
Processes	Forging, Hot Rolling, Cold Rolling/Drawing, Annealing, Surface Treatment, Cutting
Minimum Niobium Content	Meets high-purity standards (Nb content ≥ 99.95%)
Density	8.57g/cm³
Advantages	Excellent high-temperature stability, superior corrosion resistance, good electrical and thermal conductivity, ultra-pure material, excellent ductility, high dimensional accuracy, fine surface finish
Surface Conditions	Pickled Surface, Bright Annealed Surface, Cold Rolled/Drawn Surface, Polished Surface
Delivery Conditions	Soft State (M), Hard State (Y)
Processing Services	Customized dimensions (diameter, length), cutting, bending, welding, wire drawing refinement, thread processing
Minimum Order Quantity	1kg (Calculated based on actual orders; preferential terms available for bulk purchases)

Classification

Classification by Product Form

•Pure Niobium Wires: Diameter 0.3mm—1.0mm, fine specification with high precision, excellent flexibility and electrical conductivity. Suitable for precision electronic electrodes, laboratory probes, superconducting material conductors, medical device micro-wires, battery current collector filaments, etc., and can undergo processes such as wire drawing refinement, cutting, and bending forming.
•Pure Niobium Rods: Diameter 1.0mm—20mm, high structural strength, good stability, and combined high-temperature resistance and corrosion resistance. Suitable for aerospace precision structural components, chemical corrosion-resistant connectors, high-temperature equipment electrode rods, laboratory-specific fixtures, machining blanks, etc., and can be subjected to secondary processes such as cutting, turning, thread processing, and welding.
Classification by Processing State

•Soft State (M) Pure Niobium Rods/Wires: Fully annealed to completely eliminate internal stress, with excellent ductility and plasticity. Facilitates complex forming processes such as bending, stretching, winding, and deep processing, suitable for precision components requiring secondary fine processing.
•Hard State (Y) Pure Niobium Rods/Wires: Cold-rolled/drawn without annealing, featuring high strength, hardness, extremely high dimensional accuracy, and stable electrical conductivity. Suitable for scenarios with strict requirements on strength, rigidity, and dimensional stability (e.g., precision electrodes, structural brackets, wear-resistant components).
Classification by Surface Treatment Method

•Pickled Surface Pure Niobium Rods/Wires: Removes surface oxide scale and impurities, with high surface cleanliness and further improved corrosion resistance. Suitable for chemical corrosion-resistant scenarios, laboratory environments, and substrates requiring subsequent coating processing.
•Bright Annealed Surface Pure Niobium Rods/Wires: Bright and flat surface after annealing with low oxidation, usable directly without subsequent polishing. Suitable for electronic components, aerospace accessories with high appearance requirements, and precision assembly scenarios.
•Polished Surface Pure Niobium Rods/Wires: Extremely high surface finish, low roughness, and small friction coefficient. Suitable for high-precision optical components, high-end electronic devices, superconducting conductors, and scenarios requiring reduced surface loss.
•Cold Rolled/Drawn Surface Pure Niobium Rods/Wires: Retains the natural post-processing surface, high dimensional accuracy, and excellent processing performance. Suitable for scenarios with low surface appearance requirements and emphasis on mechanical properties (e.g., machining blanks, general structural components).

Specification Selection Table and Composition Table

Pure Niobium Rod/Wire Specification Selection Table

Chemical Composition Table

Product Type	Specification Range	Core Features	Application Scenarios
Laboratory-Grade Precision Pure Niobium Wires	Diameter: 0.3-0.5mm; Length: 100-5000mm (single piece)/50-500m (coiled)	Ultra-pure material (Nb≥99.95%), minimal diameter tolerance, smooth surface, excellent electrical conductivity, easy stretching and forming	Laboratory precision probes, superconducting material R&D, micro-sensor electrodes, university research projects
Industrial-Grade Universal Pure Niobium Wires	Diameter: 0.5-1.0mm; Length: 1000-5000mm (single piece)/50-1000m (coiled)	High dimensional accuracy, clean surface, excellent corrosion resistance, stable processing performance, available for bulk supply	High-temperature electronic electrodes, battery current collector filaments, medical device micro-wires, general electronic components
Industrial-Grade Standard Pure Niobium Rods	Diameter: 1.0-20mm; Length: 1000-6000mm (single piece)	High structural strength, stable high-temperature performance, good weldability, consistent dimensions	Chemical corrosion-resistant connectors, high-temperature equipment electrode rods, small aerospace structural components, machining blanks
Customized Pure Niobium Rods/Wires	Customized per customer drawings (diameter, length, surface roughness, processing state)	Strong adaptability, performance optimized on demand, high personalization, strict matching with customer equipment and process requirements	Special-specification electrodes, customized high-temperature equipment accessories, high-end equipment precision components, specialized experimental devices

Grade	Nb	Impurity Content, Max. (≤)
Grade	Nb	Fe	Si	Ni	C	N	O	H	Zr
Nb1	≥99.95	0.005	0.005	0.005	0.01	0.01	0.015	0.0015	0.02
		Cr	Ta	Mo	W	Ti	Co	Al
		0.002	0.1	0.01	0.03	0.02	0.002	0.002

Characteristics

Excellent High-Temperature Stability

Pure niobium has a melting point of up to 2468℃, enabling long-term stable operation below 1200℃ and short-term resistance to 1600℃. It maintains good mechanical properties, electrical conductivity, and structural stability in high-temperature environments, suitable for medium-high temperature and extreme high-temperature working conditions.

Superior Corrosion Resistance

Exhibits strong stability in harsh environments such as strong acids (excluding hydrofluoric acid), alkalis, molten salts, and high-temperature oxidizing atmospheres. The dense oxide film formed on the surface effectively resists corrosion without contaminating the contacting medium, making it particularly suitable for functional material applications in strong corrosive environments.

Ultra-Pure Impurity-Free Material

Complies with high-purity Nb1 grade standards, with Nb content ≥ 99.95% and extremely low levels of various impurities. No harmful impurities precipitate, and it does not chemically react with contacting materials, ensuring the safety, stability, and electrical conductivity of product use, suitable for harsh scenarios such as high-precision electronics, superconductivity, and laboratories.

Outstanding Processing Performance

Excellent ductility allows ultra-fine wire drawing processing of niobium wires (minimum diameter up to 0.05mm), and niobium rods can undergo multiple secondary processes such as turning, milling, and thread processing, meeting the preparation requirements of precision components of different shapes and specifications.

High-Precision Dimensional Control

Through precision drawing, rolling, and finishing processes, it achieves minimal diameter tolerance, low roundness error, and good dimensional consistency, which can accurately match the assembly requirements of high-end equipment and improve the performance stability and reliability of end products.

Excellent Electrical and Thermal Conductivity

High-purity material ensures excellent electrical and thermal conductivity. In scenarios such as high-temperature electrodes, superconducting conductors, and electronic components, it can effectively reduce energy loss and improve equipment operation efficiency.

Production Process

Raw Material Preparation: Niobium ore undergoes mineral processing, enrichment, reduction, and other processes to extract high-purity sponge niobium, which is then refined through multiple vacuum arc furnace meltings to produce niobium ingots meeting high-purity Nb1 grade and ASTM R04200 standards (Nb content ≥ 99.95%, uniform composition, extremely low impurity content).
Forging/Hot Rolling Processing: Niobium ingots are heated to a specific temperature and then forged or hot-rolled into round rod billets, eliminating internal defects of the ingot, refining grain structure, improving material density and mechanical properties, and laying the foundation for subsequent processing.
Cold Rolling/Drawing Processing: Niobium rod billets are subjected to multiple passes of cold rolling to reduce diameter, while niobium wires are gradually reduced in diameter through continuous drawing process. The processing volume of each pass is precisely controlled to gradually roll into pure niobium rod/wire billets close to the finished product specifications, ensuring dimensional accuracy and roundness.
Intermediate Annealing: Intermediate annealing is inserted during the cold rolling/drawing process to eliminate processing internal stress, restore material plasticity and toughness, and avoid cracking, wire breaking, deformation, and other problems in subsequent processing.

Production Process

Finished Product Annealing: According to the processing state (soft state, hard state) required by customers, the cold-rolled/drawn pure niobium rods/wires undergo finished product annealing treatment, with precise control of annealing temperature, holding time, and cooling rate to ensure that material properties meet standards.
Surface Treatment: The annealed pure niobium rods/wires undergo surface treatment, including pickling (to remove oxide scale), bright annealing (to improve surface finish), or polishing (to achieve a high mirror effect), ensuring surface quality and corrosion resistance.
Finishing & Inspection: The finished products are trimmed, cut, and straightened to meet customer size and shape requirements; subsequent rigorous inspections include composition re-testing (precise control of impurity content), dimensional accuracy testing, surface quality testing, mechanical property and electrical conductivity testing, etc. This ensures that product quality meets the requirements of high-purity Nb1 grade, ASTM R04200, and ASTM B394 standards, accompanied by material inspection reports and quality certificates.

Application Fields

Electronic Industry

High-temperature electronic electrodes, semiconductor device lead wires, superconducting material conductors, battery current collector filaments, micro-sensor electrodes. Relying on high purity, high conductivity, and high-temperature stability, it ensures the stable and efficient operation of electronic devices in extreme environments.

Chemical Industry

Connectors for pipelines transporting strong corrosive media, electrode rods for chemical reactors, fasteners for precision chemical instruments, corrosion-resistant valve spindles. Utilizes excellent corrosion resistance to extend equipment service life and improve production safety and reliability.

Laboratory Research

Precision experimental probes, connectors for high-temperature micro-reaction vessels, superconducting experimental conductors, special material R&D carriers. Ultra-pure material without impurity contamination ensures experimental precision, data accuracy, and experimental process stability.

Aerospace

High-temperature components of spacecraft, precision structural connectors, aviation instrument electrodes, lightweight composite material substrates. Combines high strength, extreme environmental tolerance, and lightweight characteristics to meet the harsh working condition requirements of the aerospace field.

Medical Devices

Micro-wires for minimally invasive surgery, precision medical instrument connectors, biocompatible devices. Resistant to corrosion by biological fluids, safe and non-toxic material, compliant with medical device hygiene standards, suitable for high-precision requirements in the medical field.

New Energy Field

High-temperature fuel cell electrodes, connectors for hydrogen-related equipment, superconducting energy storage material conductors, precision components for photovoltaic equipment. Meets the purity, conductivity, and corrosion resistance requirements of new energy materials, improving the performance, efficiency, and safety of energy equipment.

Send Inquiry

As a professional provider of high-purity pure niobium (Nb1/R04200, compliant with ASTM B394 standard) and comprehensive solutions for various metal rods/wires, plates/sheets, foils/strips, pipes, and crucibles, Baoji Yunjie is ready to serve you at any time! For a full range of metal materials and products such as titanium, niobium, zirconium, nickel, aluminum, tantalum, tungsten, and cobalt, please feel free to contact us!

Pure Niobium Rods/Niobium Wires: Specialized Solutions for Industrial & Laboratory Applications

Product specification

Classification

Specification Selection Table and Composition Table

Characteristics

Production Process

Production Process

Application Fields

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