Detailed explanation of niobium rod types and specifications!
1. Types of niobium rods
a.Pure niobium rods
① Brand: R04200, R04210, purity ≥99.95%.
High-purity niobium rods: purity ≥99.99%, used in high-end fields such as nuclear industry and superconducting materials.
② Alloy niobium rods:
b. Niobium-tungsten alloy (Nb521): contains 4.5%-5.5% tungsten, 1.5%-2.5% molybdenum, and 0.7%-1.5% zirconium, with excellent high-temperature strength.
c. Niobium-titanium alloy (NbTi50): titanium content 47%-50%, outstanding superconducting performance.
d. Niobium-zirconium alloy (RO4261): zirconium content 0.8%-1.2%, strong corrosion resistance.
2. Specifications
a. Size range
Diameter: 3.0~100mm (common size 3.0~95mm), length can be customized.
Tolerance: ±0.05mm for diameter ≤4.5mm, ±0.07mm for diameter 4.5~6.5mm.
b. State classification
Hard state (Y): high hardness, suitable for wear-resistant scenarios.
Semi-hard state: both strength and ductility.
Soft state (M): excellent ductility, easy for subsequent processing.
c. Chemical composition standard
Pure niobium rod: impurity content is strictly limited.
Alloy niobium rod: alloy elements must meet specific ratios.
d. Mechanical properties
Tensile strength: ≥125MPa.
Elongation: ≥25%.
Summary: Niobium rods include pure niobium and various alloy types. Specifications need to be selected in combination with brand, size, state and industry standards.
2. Characteristics of niobium rods:
a. High purity and stable composition
Purity reaches the standard: The purity of high-quality niobium rods is usually above 99.5%, and high-purity products (such as those used in aerospace, electronics and other fields) can reach 99.9% or even 99.99%, and the content of impurity elements (such as oxygen, nitrogen, carbon, hydrogen, etc.) is extremely low. For example, the oxygen content needs to be controlled below 50ppm to avoid increased brittleness or performance fluctuations of the material due to impurities.
Uniform composition: Through vacuum melting, electron beam refining and other processes, the internal composition of the niobium rod is ensured to be evenly distributed without segregation or inclusions, ensuring the stability of the material under extreme environments such as high temperature and high pressure.
b. Excellent surface quality
High finish: The surface has no defects such as cracks, scratches, depressions, oxide scale, etc., and the color is uniform (silver-white metallic luster), reducing the cost of subsequent polishing and other processes.
No rust or pollution: Through strict cleaning, drying and packaging processes, ensure that there is no oil, water stains or rust on the surface. In particular, high-purity niobium rods may be vacuum packed to prevent contamination during storage and transportation.
c. Precision size and processing accuracy
Small dimensional tolerance: The deviation of key dimensions such as diameter and length is strictly controlled within ±0.1mm (depending on the specifications) to ensure matching with downstream assembly requirements.
High straightness: The overall straightness of the niobium rod is good, without obvious bending or twisting, avoiding material waste or product scrapping due to shape deviation during subsequent processing.
