ASTM B392 UNS R04200 R04210 Pure Niobium Bar

Pure Niobium bar is an important rare metal material that holds an irreplaceable position in high-end manufacturing due to its unique physical and chemical properties. The following is a systematic analysis of its core product features:
1, Excellent high-temperature stability
High melting point: The melting point of niobium is as high as 2468 ℃, with a boiling point of 4742 ℃ and a density of 8.57 g/cm ³. It can maintain good structural strength and dimensional stability even in high temperature environments.
High temperature strength retention: It still has sufficient strength, plasticity, and thermal conductivity above 1000 ℃, suitable for extreme thermal environment components such as aircraft engines and rocket nozzles.
Antioxidant capacity: High purity niobium is stable in air and is not easily oxidized in a red hot state; However, when the temperature exceeds 200 ℃, it is prone to react with oxygen and halogens, so alloying (such as adding zirconium) is often used to enhance its antioxidant properties.
2, Excellent corrosion resistance
Niobium has strong corrosion resistance to most inorganic acids (except hydrofluoric acid), alkaline solutions, and aqua regia, and is particularly suitable for use as chemical equipment components in highly corrosive media such as nitric acid, hydrochloric acid, sulfuric acid, etc.
Long term operation in a vacuum or inert gas environment without performance degradation is widely used in corrosion-resistant reactors, pipeline linings, and seals.

3, Excellent superconducting performance
High critical temperature: At standard atmospheric pressure, the superconducting transition temperature of niobium is 9.2-9.25K, which is the highest among all elements and has the highest magnetic penetration depth, belonging to Class II superconductors.
Mainstream superconducting material foundation: High purity niobium rods are mainly used for the production of niobium titanium (Nb Ti) and niobium tristin (Nb ∝ Sn) superconducting wires, which are widely used in fields such as magnetic resonance imaging equipment (MRI), particle accelerators, superconducting magnets, etc.
4, Good processing and mechanical properties
High ductility: High purity niobium metal has excellent ductility and can undergo cold processing such as rolling, forging, and drawing at room temperature. Its elongation can reach 30% -50%, making it suitable for manufacturing complex shaped parts such as corrugated pipes and irregular connectors.
Good cold processing performance: High precision bars can be obtained through cold rolling, cold drawing, and other methods, with high surface smoothness, meeting the requirements of precision components in fields such as electronics and aerospace.
Moderate mechanical strength: The room temperature tensile strength is about 200-300MPa, which is lower than that of steel materials, but can be increased to 500-800MPa through alloying (such as Nb-W, Nb Zr), expanding its application in high-temperature structural components.