Nb521 Overview
Niobium Alloy Nb-521 (Nb-5W-2Mo-1Zr-0.1C) is a niobium‑base material strengthened with tungsten, molybdenum, zirconium, and a minor carbon addition. Its combined solid‑solution and precipitation hardening effects deliver enhanced tensile and creep performance at both room and elevated temperatures, while maintaining a balanced strength‑ductility profile. This set of characteristics enables broad deployment for applications requiring excellent elevated-temperature strength, good fabricability, and stable performance in vacuum or inert atmospheres.
MH Nb521 chemical Compositions
| Elements | Nb | W | Mo | Zr | O | N | C | H |
| Content(%) | Balance | 4.5 – 5.5 | 1.8 – 2.5 | 0.8 – 1.2 | ≤ 0.005 | ≤ 0.01 | ≤ 0.02 | ≤ 0.0015 |
Note:
Nb521 is a solid solution strengthened + trace element strengthened niobium alloy.
W and Mo provide high-temperature strength.
Zr improves microstructure stability and oxidation resistance.
MH's product feature: low oxygen content (0.005% O).
NB521 Physical Properties
| Property | Density | Melting Point | Thermal Conductivity | Coefficient of Thermal Expansion |
Elastic Modulus | Electrical Resistivity |
| Value | 8.5 – 8.8 g/cm³ | ~2470°C | 50 – 60 W/m·K (at room temp) |
7.0 – 7.5 ×10⁻⁶ /K | 100 – 110 GPa | 1.4 – 1.8 µΩ·m |
Features:
Lower density than tungsten and molybdenum → More suitable for lightweight aerospace applications
Low coefficient of thermal expansion → Good thermal stability
Superior thermal conductivity compared to many high-temperature alloy
| Tensile properties of Niobium Alloy bars | |||||
| Test temperature (°C) | Yield strength at specified plastic strain (MPa) | Tensile strength (MPa) | Elongation at break (%) | Area reduction percentage | |
| 1 | Room Temperature | 518 | 602 | 31.0 | 78 |
| 2 | Room Temperature | 483 | 572 | 32.0 | 79 |
MH Niobium Alloy Nb521 Available Product Forms
MH supply Nb-521 niobium alloy in a wide range of forms:
●Rod & Bar: φ5-φ200
● Plate & Sheet:Thickness: 0.5 mm to 50 mm,Width: up to 600 mm
● Wire: φ0.1-φ5
● Tube: Wall 0.1-10mm, Diameter φ0.86-φ120mm
● Precision machined components
(Custom dimensions, tolerances, and delivery conditions available upon request.)
Key Features of Nb521 Alloy
Excellent High Temperature Resistance
Nb521 maintains good performance in high-temperature environments, making it suitable for structural parts and thermal service components exposed to severe heat loads.
Good Strength Retention
Compared with pure niobium, Nb521 provides enhanced mechanical strength at elevated temperatures, helping improve component reliability and service life.
Good Fabricability
Nb521 can be processed into different semi-finished and finished forms, including bars, sheets, tubes, and precision machined components, supporting custom manufacturing requirements.
Suitable for Vacuum and Harsh Environments
Niobium alloys are often used in vacuum furnaces, aerospace thermal structures, and other demanding environments where refractory metal stability is required.
Wide Industrial Adaptability
Nb521 is applicable to aerospace, defense-related industry, high-temperature equipment, scientific research, and other advanced engineering fields.
applications of Nb521
1.Aerospace Field
Nb521 bar stock is widely adopted in the production of critical parts for aerospace engines, weapon propulsion systems, and rocket & missile liquid bipropellant engines. Typical applications include combustion chambers, engine nose cones, nozzles, exhaust ducts, and fuel injectors. These components rely on Nb521's exceptional room‑ and high‑temperature mechanical properties, high melting point, low density, strong elevated‑temperature strength, and favorable manufacturability. The alloy retains stable performance under extreme thermal conditions, fully satisfying the strict material demands of advanced aerospace vehicles.
2. Industrial Field
Nb521 rods are utilized to produce key components in gas turbines, automotive engines, and diesel engines, effectively boosting engine efficiency and operational reliability.In addition, the alloy is extensively used for fabricating high‑temperature furnace heating elements, hot‑working dies, high‑temperature fixtures, and refractory crucibles. Leveraging its outstanding heat resistance, high strength, and structural stability, Nb521 significantly extends service life and improves the working efficiency of such industrial equipment and tooling.
3. Medical Field
Benefiting from the excellent biocompatibility and corrosion resistance of niobium‑based alloys, Nb521 poses no adverse immune reactions in the human body. It can be employed to fabricate critical components for medical devices, including parts used in radiation shielding and protection systems.
Custom Manufacturing
We offer custom niobium solutions, including:
● Non-standard dimensions
● Tight tolerance control
● Special surface finishes
● Application-specific technical requirements
Please provide drawings or detailed specifications for evaluation.
Manufacturing Capability
MH provide Nb521 alloy products based on a complete refractory metal production route, including:
- Vacuum melting
- Forging
- Rolling
- Drawing
- Heat treatment
- Precision machining
- Surface finishing
With experience in refractory metals and precision manufacturing, we can support both raw material supply and finished custom components according to customer drawings.
Chemical Composition
Nb521 is a niobium alloy grade. Specific composition requirements can be supplied according to customer technical standards or project requirements.
If needed, we can provide:
- Material certificate
- Chemical composition report
- Mechanical property report
- Size inspection report
Why Choose Our Nb521 Alloy
Stable Refractory Metal Manufacturing Capability
We have experience in refractory metal production and processing, enabling us to provide reliable niobium alloy supply for industrial customers.
Multiple Product Forms Available
From standard bars and sheets to custom machined parts, we support flexible manufacturing solutions.
Custom Processing Support
We can produce according to customer drawings, target dimensions, and special technical requirements.
Strict Quality Control
Each batch can be supported with inspection documents to ensure traceability and stable quality.
Integrated Material and Machining Supply
In addition to raw and semi-finished materials, we can also provide further machining services for finished Nb521 alloy components.
Packaging and Supply
Standard export packaging is available for international shipment.
We support:
- Small quantity samples
- Trial orders
- Bulk production
- Custom packaging on request
Frequently Asked Questions
Is Nb521 suitable for high-temperature applications?
Yes. Nb521 is designed for demanding high-temperature service and offers better high-temperature strength than pure niobium.
Can you supply custom sizes?
Yes. We support customized dimensions and custom-machined parts based on drawings or specifications.
What forms can you provide?
We can supply bar, rod, sheet, plate, tube, wire, ring, and custom fabricated or machined parts.
Can material certificates be provided?
Yes. Material certificate, composition report, and inspection documents can be provided based on order requirements.
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