Niobium R04251 Fasteners are manufactured from UNS R04251 Type 3 reactor-grade niobium alloy containing approximately 1% zirconium. Also known as Reactor Grade Nb-1Zr Fasteners, this material is specified where controlled chemistry, corrosion resistance, ductility and specialized niobium-alloy performance are required. ASTM B392-26 specifically identifies R04251 as Type 3 reactor-grade niobium alloy containing 1% zirconium.
We supply UNS R04251 Bolts and Studs, Niobium R04251 Hex Head Bolts, screws, nuts, threaded rods and custom-machined fasteners for specialized industrial requirements. Fasteners can be produced in metric, imperial or drawing-specific dimensions with suitable documentation and material traceability.
What Are Niobium R04251 Fasteners?
Niobium R04251 Fasteners are specialized fasteners manufactured from UNS R04251 Type 3 reactor-grade Nb-1Zr alloy. The alloy contains approximately 0.8–1.2% zirconium, with niobium as the balance and controlled limits on interstitial elements. R04251 is covered among the wrought niobium and niobium alloy grades in ASTM B392 and is used for specialized corrosion-resistant, high-temperature and nuclear-related applications where niobium-zirconium material characteristics are required.
What Is UNS R04251 Nb-1Zr?
UNS R04251 is a reactor-grade niobium-zirconium alloy generally described as Nb-1Zr. Under ASTM B392, it is designated Type 3, distinguishing it from R04261 Type 4, which is commercial-grade Nb-1Zr.
The addition of zirconium provides an alloyed niobium material with higher strength than unalloyed reactor-grade niobium. The grade also maintains the chemical resistance and specialized characteristics associated with niobium.
This makes UNS R04251 Fasteners suitable for applications where ordinary stainless steel or conventional nickel alloys may not provide the required combination of material purity, corrosion resistance or specialized refractory-metal performance.
Table of Contents
- ➤ What Are Niobium R04251 Fasteners?
- ➤ What Is UNS R04251 Nb-1Zr?
- ➤ UNS R04251 Fasteners Specifications Chart
- ➤ Types of Niobium R04251 Fasteners
- ➤ Chemical Composition of UNS R04251
- ➤ Mechanical Properties of R04251 Fasteners
- ➤ Why Choose Corrosion Resistant R04251 Fasteners?
- ➤ Manufacturing of UNS R04251 Bolts and Studs
- ➤ Niobium R04251 Fastener Weight Chart
- ➤ Equivalent Grades of Niobium R04251
- ➤ Applications of UNS R04251 Fasteners
- ➤ R04251 Fastener Sizes and Standards
- ➤ Niobium R04251 Fasteners Stockist and Exporter
- ➤ Why Buy UNS R04251 Fasteners From Us?
UNS R04251 Fasteners Specifications Chart
| Specification | UNS R04251 Requirement |
|---|---|
| Material | Niobium-1% Zirconium |
| UNS Number | R04251 |
| ASTM Type | Type 3 |
| Grade | Reactor Grade Nb-1Zr |
| Primary Material Standard | ASTM B392 |
| Product Forms Covered by B392 | Bar, rod and wire |
| Alloy | Nb-Zr |
| Zirconium | 0.8–1.2% |
| Base Material | Niobium |
| Fastener Type | Bolts, screws, nuts, studs, threaded rods and custom parts |
| Thread | Metric, UNC, UNF or custom |
| Manufacturing | Machined / formed / custom manufactured |
| Condition | As specified by purchase requirement |
| Inspection | As specified by customer |
Types of Niobium R04251 Fasteners
We manufacture and supply different UNS R04251 Fasteners according to application, dimensions and drawing requirements.
- Niobium R04251 Hex Head Bolts
- UNS R04251 Hex Bolts
- R04251 Machine Screws
- Nb-1Zr UNS R04251 Screws and Nuts
- UNS R04251 Stud Bolts
- Double-End Studs
- Full Threaded Studs
- R04251 Threaded Rods
- Socket Head Cap Screws
- Flat Head Screws
- Pan Head Screws
- Custom Niobium Bolts
- Custom Nuts
- Washers
- Special Drawing-Based Fasteners
Thread length, head dimensions, shank diameter and other dimensions can be customized according to drawings or specified requirements.
Chemical Composition of UNS R04251
| Element | UNS R04251 / Type 3 |
|---|---|
| Niobium (Nb) | Balance |
| Zirconium (Zr) | 0.80–1.20% |
| Carbon (C) | 0.010% max. |
| Nitrogen (N) | 0.010% max. |
| Oxygen (O) | 0.015% max. |
| Hydrogen (H) | 0.0015% max. |
| Tantalum (Ta) | 0.10% max.* |
| Iron (Fe) | 0.005% max.* |
| Silicon (Si) | 0.005% max.* |
| Tungsten (W) | 0.030% max.* |
| Nickel (Ni) | 0.005% max.* |
| Molybdenum (Mo) | 0.010% max.* |
| Hafnium (Hf) | 0.020% max.* |
| Titanium (Ti) | 0.020% max.* |
Mechanical Properties of R04251 Fasteners
| Mechanical Property | R04251 Type 3 |
|---|---|
| Tensile Strength, min. | 195 MPa |
| Tensile Strength, min. | 28,000 psi |
| Yield Strength, 0.2% offset, min. | 125 MPa |
| Yield Strength, 0.2% offset, min. | 18,000 psi |
| Elongation, min. | 20% |
| Brinell Hardness | Product/condition dependent |
Why Choose Corrosion Resistant R04251 Fasteners?
Corrosion Resistant R04251 Fasteners are selected for specialized service where resistance to aggressive chemical environments is required. Niobium is known for its strong chemical resistance, while the Nb-1Zr alloy provides an engineered combination of corrosion resistance and improved strength.
Important characteristics include:
- Reactor-grade material classification
- Controlled interstitial chemistry
- Niobium-zirconium alloy composition
- Good ductility
- Corrosion resistance in suitable chemical environments
- Specialized elevated-temperature performance
- Suitable for custom-machined fasteners
- Useful in demanding chemical and nuclear-related applications
Actual corrosion performance depends on the process medium, concentration, temperature, pressure and exposure conditions, so the material should be evaluated for the specific service environment.
Manufacturing of UNS R04251 Bolts and Studs
Niobium R04251 Fastener Weight Chart
| Nominal Diameter | Approx. Weight of Solid Rod per Metre* |
|---|---|
| 6 mm | 0.243 kg/m |
| 8 mm | 0.433 kg/m |
| 10 mm | 0.675 kg/m |
| 12 mm | 0.973 kg/m |
| 16 mm | 1.733 kg/m |
| 20 mm | 2.702 kg/m |
| 24 mm | 3.895 kg/m |
| 30 mm | 6.079 kg/m |
| 36 mm | 8.755 kg/m |
| 40 mm | 10.807 kg/m |
Equivalent Grades of Niobium R04251
| Designation | Description | Relationship |
|---|---|---|
| UNS R04251 | Reactor-grade Nb-1Zr | Primary UNS designation |
| ASTM B392 Type 3 | Reactor-grade Nb-1Zr | Primary ASTM classification |
| Nb-1Zr | Niobium with approximately 1% Zr | Common alloy description |
| NbZr1 | Niobium-zirconium alloy | Common descriptive designation |
| R04261 | Commercial-grade Nb-1Zr | Not equivalent; ASTM Type 4 |
| R04200 | Reactor-grade unalloyed niobium | Not equivalent; ASTM Type 1 |
ASTM B392 explicitly distinguishes R04251 Type 3 reactor-grade Nb-1Zr from R04261 Type 4 commercial-grade Nb-1Zr. Therefore, R04261 should not be presented as a direct equivalent of R04251.
Applications of UNS R04251 Fasteners
The specialized characteristics of Nb-1Zr make R04251 fasteners suitable for selected applications such as:
- Nuclear and reactor-related equipment
- Chemical processing systems
- Corrosive chemical service
- Specialized process equipment
- High-temperature engineering
- Research and laboratory equipment
- Advanced energy systems
- Refractory-metal assemblies
- Custom engineered equipment
The final material choice should be based on operating temperature, mechanical loading, chemical environment and applicable design requirements.
R04251 Fastener Sizes and Standards
We supply Niobium R04251 Hex Head Bolts, screws, nuts and studs in standard and custom dimensions.
Available configurations can include:
- Metric sizes
- Inch sizes
- UNC threads
- UNF threads
- Fine and coarse threads
- Full-thread studs
- Partial-thread bolts
- Custom thread lengths
- Custom head styles
- Drawing-specific fasteners
Customers can provide a drawing, specification or sample requirement for review.
Niobium R04251 Fasteners Stockist and Exporter
As a Type 3 UNS R04251 Niobium Fasteners Stockist, we supply specialized Nb-1Zr fasteners for industrial buyers requiring controlled material specifications and custom dimensions.
Our supply range includes:
- Niobium R04251 Fasteners
- UNS R04251 Bolts and Studs
- Niobium R04251 Hex Head Bolts
- Nb-1Zr UNS R04251 Screws and Nuts
- Threaded rods
- Custom-machined fasteners
- Drawing-based components
We also handle international requirements as a Niobium R04251 Fasteners Exporter to USA, with packaging and documentation arranged according to the purchase requirement.
Why Buy UNS R04251 Fasteners From Us?
We focus on supplying specialized niobium alloy fasteners according to the customer's technical requirements. Our team can assist with material selection, dimensions, thread configuration, quantity, documentation and custom machining requirements.
Whether you need UNS R04251 Bolts and Studs, Niobium R04251 Hex Head Bolts, R04251 screws and nuts or custom Nb-1Zr fasteners, you can provide your drawing or specification for quotation.
Request a Quote for Niobium R04251 Fasteners
Looking for a UNS R04251 Nb-1Zr Bolts Supplier in India, a Type 3 UNS R04251 Niobium Fasteners Stockist, or a Niobium R04251 Fasteners Exporter to USA?
Send us your required fastener type, dimensions, quantity, thread specification, applicable standard and documentation requirements. We can review the requirement and provide a quotation for reactor-grade UNS R04251 Nb-1Zr fasteners.
