Niobium flange

I. Product Introduction Niobium flanges are disc-shaped pipe/equipment connection parts made from high-purity niobium (Nb) or niobium alloys through forging, machining, and heat treatment. Their core advantages are strong corrosion resistance, high temperature resistance, high purity, and superconductivity, making them suitable for sealing connections under extreme operating conditions.

1. Material and Grade

Pure Niobium: R04200 (99.95%), R04210 (99.9%), High-purity Niobium (RRR300+, Superconducting Grade)

Standards: ASTM B394, ASTM B392 (High Purity / Superconducting), ASME B16.5

2. Core Properties

Appearance: Silver-gray metallic luster

Density: 8.6 g/cm³

Melting Point: 2468℃ (High Temperature Resistance)

Corrosion Resistance: Resistant to hydrochloric acid, sulfuric acid, phosphoric acid, strong alkalis, seawater, and molten alkali corrosion

Mechanical Properties: Tensile strength ≥200MPa, elongation ≥25%, annealed hardness HV120-160

Others: Low thermal neutron absorption cross section, low-temperature superconductivity, good weldability

3. Types and Specifications

Types: Welding flange (WN), Flat flange (SO), Socket flange (SW)
Blind flange (BL), Threaded flange (Th), Reducing flange
Pressure Rating: Class 150/300/600/900/1500/2500; PN6/10/16/25/40/64/100 Sizes: DN15 (1/2") ~ DN1200 (48") Surface: Machined surface, Sealing surface (RF/FF/TG)

4. Production Process High-purity niobium ingot → Forging / Rolling → Heat Treatment → CNC Machining → Pickling / Polishing → Flaw Detection (UT/PT) → Packaging

II. Main Application Areas

1. Chemical and Corrosion-Resistant Industries (Most Widely Used)
Strong Corrosive Media: Hydrochloric acid, dilute sulfuric acid, phosphoric acid, organic acids, caustic alkalis, salt solutions for pipeline/equipment connections
Application Scenarios: Chlor-alkali chemical industry, hydrometallurgy, acetic acid plants, fertilizers, chemical fibers, environmental desulfurization
Replacement: Replaces stainless steel, Hastelloy, titanium, solves pitting/crevice corrosion

2. Aerospace and Military Industry

High-Temperature Structures: Engine high-temperature piping, combustion chamber, hydraulic system (high temperature resistance, creep resistance)

Aerospace: Rocket propellant piping, satellite cryogenic system (liquid oxygen/liquid hydrogen resistance, lightweight and high strength)

3. Nuclear Power and Nuclear Industry

Nuclear Reactors: Primary loop, nuclear fuel reprocessing, heat exchangers (low neutron absorption, radiation resistance, corrosion resistance)

Nuclear Chemical Industry: Radioactive waste treatment, uranium purification equipment

4. Superconductivity and Cryogenic Engineering

High-purity RRR niobium flanges: Superconducting magnets, MRI, particle accelerators, nuclear fusion devices (cryoconducting connections)

Cryogenic Media: Liquid helium (-269℃), liquid nitrogen, liquid hydrogen piping systems

5. Electronics, Semiconductors and Vacuum

Semiconductors: Single crystal furnaces, vacuum coating, ion implantation equipment (high purity, non-magnetic, corrosion resistant)

Vacuum Industry: High vacuum/ultra-high vacuum chambers, electron beam melting furnace connections

6. Pharmaceuticals and Bioengineering

Pharmaceuticals: API synthesis, high-purity media transportation (corrosion resistant, no metal ion release)

Biomedicine: Artificial joints, implantable devices (good biocompatibility)

7. Special Metallurgy and Glass

Special Steel: High-temperature alloys, stainless steel (niobium-stabilized) with matching flanges

Glass: Glass furnaces, platinum channel connections (high temperature resistance, resistant to molten glass corrosion)

III. Selection Criteria

Media: Preferred for hydrochloric acid, alkalis, salts, and reducing acids; not resistant to concentrated nitric acid and fluorides.

Temperature: -269℃~400℃ long-term, short-term ≤600℃

Comparison: Corrosion resistance superior to titanium and zirconium; price higher than titanium, lower than tantalum.

Connection: Matching niobium pipes/niobium equipment, using argon arc welding (same material welding material).

Quality Control and Testing

Each product undergoes rigorous inspection before shipment:

Dimensional Inspection: Precise measurement of thickness, length, and width

Chemical Composition and Mechanical Property Analysis: Third-party testing reports

Surface Inspection: Visual and microscopic inspection for defects

Ultrasonic Testing: Detection of internal defects

Why Choose Us

Technology and Quality: Located in Baoji, China's Titanium Valley, we possess professional production technology and extensive experience in non-ferrous metal manufacturing.

Global Coverage: We provide consistently high-quality products to customers in Australia, South Korea, Germany, the USA, the UK, Malaysia, and the Middle East.

Quality Commitment: We never compromise on quality and are responsible for every product we manufacture.

Technical Support: We have professional personnel overseeing the entire process from raw materials to finished products!

Contact Us
Our team is dedicated to serving you and hopes that every product you purchase will meet your expectations!

Email: lucky@bjfreelong.com

WhatsApp: +13369210303

Please contact us for detailed quotations and technical specifications. We look forward to becoming your trusted high-end titanium materials partner.