Pure Niobium Sheet

CHDY supplies flat-rolled refractory metal products. Chemical plants use them, and so do vacuum systems. Superconducting projects rely on them too. R04200 and R04210 grades of Pure Niobium Sheet are part of the range. Electron beam melted niobium ingots are the starting point. The product follows ASTM B393. R04200 Type 1 hits a purity floor of 99.95%. Superconducting use may need a high RRR. The listed figure for that case is 99.99%. Density is 8.57 g/cm³. It melts at 2468 °C. The CHDY name stands for Shaanxi Chuanghui Daye Metal Material Co., Ltd. The company is based in Baoji, China. A drawing is enough to start. You can also just tell us what you need. The team will confirm the thickness and material condition we can supply.

What Is Pure Niobium Sheet?

You get this product as a flat product, and the base is commercially pure niobium. Ductile and refractory, this metal has a density of 8.57 g/cm³. Thickness is not fixed. Cutting and forming to your drawing happen after that.

Buyers come to this material for three reasons. One is resistance to hot acids. Those acids can beat titanium or stainless steel. Growing synthetic diamond is a second reason. That process needs something pure and inert. The third is thermal stability. High-vacuum systems need it. Aerospace propulsion systems need it too.

Specifications

Look over these values first. Do that before you send an inquiry.

Purity for R04210, tolerances, mechanical values, MOQ and lead time are not given in the product data, so they are not listed here. Please ask for confirmation.

Grades and Purity

• R04200 Type 1 (Reactor Grade): Interstitial impurities are few in this grade. Carbon stays low. Oxygen does too. Nitrogen and hydrogen remain low as well. Electronics work fits it. Superconducting work suits it too.
• R04210 (Commercial Grade): General alloying suits it. Chemical use does too.

Ingots are electron beam melted. Minimum purity is 99.95% for R04200 Type 1, and superconducting, high-RRR applications use 99.99%.

Key Properties

• Cold workability: Niobium can be deep drawn and stamped at room temperature. Bending causes few problems. Tungsten or molybdenum is harder to shape the same way.
• Corrosion resistance: A stable layer of niobium pentoxide (Nb₂O₅) heals itself. Below 100 °C, many organic and mineral acids have no effect on it. Fit still depends on which acid is used. Temperature and concentration also play a part.
• Low neutron absorption cross-section: Nuclear reactor use is where this trait matters most.
• Chemical inertness: For some setups, contamination from the material is not acceptable. This property keeps contamination low.
• Superconductivity: Take this metal down to cryogenic temperature, 9.25 K, and it becomes a superconductor.

Applications

Pure Niobium Sheet is used in three demanding fields.

Synthetic diamond manufacturing (CVD/HPHT): Seed holders and growth substrates are cut from this sheet. Diamond synthesis takes high heat. Clean conditions count as well. Both needs are met by a high melting point and chemical stability.

Chemical processing equipment: One use is liners in nitric acid plants and hydrometallurgical processes. Rupture discs and heat exchanger plates are made from the material too. Let us know which acid you work with. Its concentration and the temperature it runs at matter to us as well. We then check how well it holds up under those conditions.

Superconducting radio frequency (SRF) cavities: Cavity cells for particle accelerators get deep-drawn from high-purity sheet. RRR values on that sheet sit above 300. Inside the cavities, an ultra-high vacuum is maintained. Temperatures hold near absolute zero. One inclusion at the surface is enough to cause thermal breakdown (quench). Clean surfaces are a must, then.

Inspection Items to Specify

These checks are the usual way to verify niobium sheet. What test and report details come with your order? Ask CHDY.

• Chemical composition: O, N, H and C get measured by inert gas fusion (IGF). Metallic impurities such as Ta, W and Fe are checked with GDMS.
• Microstructure: ASTM E112 is used for the grain size check. When parts are deep drawn, "orange peel" can appear if the structure is not uniform and fully recrystallized. A uniform, fully recrystallized structure helps stop it.
• Ultrasonic testing (UT): Vacuum leaks can start at internal voids and laminations. UT detects them.
• Surface inspection: The surface gets looked over by eye, and dye penetrant is used too. Scratches and pits turn up this way, as do rolled-in impurities. Corrosion resistance drops because of those flaws.
• Mechanical testing: Tensile strength, yield strength and elongation per ASTM E8.

Be used in a wide range of industries.

 

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Electronic devices

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Medical implants

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Steel industry

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Chemical Processing

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Aerospace and Defense

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Energy and Environmental Engineering

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Electron beam melting

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Forging

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Rolling 

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Machining and forming

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Dimension inspection

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Packaging

Finishes, Sizes and Customization for Pure Niobium Sheet

This product can be ordered in several finishes. An acid-pickled finish gives a matte gray look. A cold-rolled bright surface is another choice. Polished sheet is available as well. Electro-polished sheet is used for vacuum and medical applications.

Thickness, dimensions and material condition depend on your grade and processing specification. To receive a quotation, send:

• Grade (R04200 Type 1 or R04210)
• Thickness and dimensions
• Material condition and surface finish
• Drawing, if available
• Application and any purity, RRR or impurity limits

About CHDY

CHDY is located in Baoji High-tech Development Zone, Shaanxi Province. Besides niobium, the company supplies titanium, tantalum products for metallurgy, electronics, medical and special steel fields.

CHDY focuses on supplying titanium, tantalum, niobium, and other refractory metal materials.

We can assist customers with checking material grades, available dimensions, and export arrangements. and we have rich experience in general export license.

Our team also handles Pure Niobium Sheet material paperwork. We arrange shipping details to fit the agreed order requirements.

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ISO 9001:2015

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ISO 9001:2015

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FAQ

Q: How do R04200 and R04210 differ?

A: Interstitial impurities (O, N, C, H) stay low in R04200 Type 1 (Reactor Grade). Does it suit electronics work? Yes, it does. Superconducting work fits it as well. For general alloying and chemical use, R04210 (Commercial Grade) is the grade to pick.

Q: What keeps niobium sheet from turning brittle when I weld it?

A: Above 200 °C, oxygen and nitrogen begin to attack the niobium. Welding inside an electron beam chamber is one way around that. The chamber is kept at high vacuum. Controlled TIG also works. There you shield with 99.999% pure argon. Trailing shields get used as well. Talk the procedure through with your welding engineer before the job starts.

Q: Is open-air heat treatment an option for this product?

A: No. Oxygen gets into the metal once you pass 200 °C. Serious brittleness can follow. Annealing and stress relief call for a high-vacuum furnace held below 10⁻⁴ Torr.

Q: Which finishes work for medical or vacuum parts?

A: Acid-pickled, cold-rolled bright, polished, and electro-polished are the four options you can pick from. Vacuum and medical work calls for electro-polished sheet.

Q: Does tantalum content matter?

A: Tantalum occurs naturally with niobium. Nuclear applications may require tantalum below 1000 ppm because of neutron cross-section. State your limit in the inquiry so it can be confirmed.

Contact Us

Send your grade, thickness, finish and drawing to info@chdymetal.com to request a Pure Niobium Sheet quotation.