Hastelloy B3 Fasteners are nickel-molybdenum alloy fasteners manufactured from Hastelloy B-3 / UNS N10675 for applications requiring excellent resistance to reducing acids, pitting, stress-corrosion cracking, and localized corrosion. These fasteners are commonly supplied as bolts, nuts, stud bolts, threaded rods, screws, U-bolts, and flange bolts for chemical processing, petrochemical, pharmaceutical, and industrial equipment.
Hastelloy B3 offers excellent resistance to hydrochloric acid and other aggressive reducing environments, making it suitable for demanding fastening applications where conventional stainless steel fasteners may not provide adequate corrosion resistance.
What Are Hastelloy B3 Fasteners?
Hastelloy B3 Fasteners are high-performance Nickel Alloy B3 Fasteners designed for severe corrosive environments. Hastelloy B3 is a nickel-molybdenum alloy containing a high level of molybdenum with controlled additions of chromium and iron.
Also known as Hastelloy B-3 Fasteners and Alloy B3 Fasteners, this grade is valued for its resistance to hydrochloric acid and other reducing chemical environments. Its improved thermal stability compared with earlier B-series alloys makes it suitable for fabricated equipment exposed to changing process conditions.
We manufacture and supply Hastelloy B3 Bolts in different configurations, dimensions, thread forms, and finishes according to project requirements and applicable specifications.
Hastelloy B3 Fasteners Specifications
| Property | Details |
|---|---|
| Product | Hastelloy B3 Fasteners |
| Alloy | Hastelloy B3 / Alloy B3 |
| UNS | N10675 |
| Werkstoff Number | 2.4600 |
| EN Material Number | 2.4600 |
| ASTM | ASTM B335 / applicable product specification |
| ASME | ASME SB574 / applicable product specification |
| Fastener Types | Bolts, nuts, studs, screws, threaded rods, U-bolts |
| Manufacturing | Forged / machined / cold worked where applicable |
| Thread Standard | UNC, UNF, Metric and project-specific threads |
| Surface | Plain, polished or customized |
| Form | Hex, heavy hex, socket, stud and specialty configurations |
Table of Contents
- ➤ What Are Hastelloy B3 Fasteners?
- ➤ Hastelloy B3 Fasteners Specifications
- ➤ Types of Hastelloy B3 Bolts and Nuts We Supply
- ➤ Hastelloy B3 Fasteners Chemical Composition
- ➤ Mechanical Properties of Hastelloy B3 Fasteners
- ➤ Hastelloy B3 Fasteners Weight Chart
- ➤ Hastelloy B3 Equivalent Grades Chart
- ➤ Key Properties of Nickel Alloy B3 Fasteners
- ➤ Applications of Hastelloy B3 Fasteners
- ➤ ASTM B335 Alloy B3 Bolts and ASME SB574 Studs
- ➤ Hastelloy B3 Fasteners Dimensions & Standards
- ➤ What Makes Our Hastelloy B-3 Bolts the Right Choice?
- ➤ Hastelloy B3 Fasteners Manufacturer & Supplier
Types of Hastelloy B3 Bolts and Nuts We Supply
We supply Hastelloy B3 Bolts and Nuts in multiple configurations to accommodate different industrial fastening requirements.
➤ Hastelloy B3 Stud Bolts & Threaded Rods
Hastelloy B3 Stud Bolts & Threaded Rods are used for bolted flange connections, pressure equipment, piping systems, and fabricated chemical-processing equipment. They can be supplied with full-thread or specified-thread configurations.
➤ UNS N10675 Hex Bolts
UNS N10675 Hex Bolts feature a hexagonal head that allows installation using standard tools. They are suitable for general structural and equipment fastening in corrosive environments.
➤ UNS N10675 Stud Bolts
UNS N10675 Stud Bolts are commonly selected for flange connections and applications where controlled clamping across two nuts is required.
➤ Hastelloy B3 Flange Bolts & U-Bolts
Hastelloy B3 Flange Bolts & U-Bolts are available for specialized piping, equipment supports, clamps, and flange assemblies exposed to aggressive chemical conditions.
➤ Werkstoff Nr 2.4600 Screws
Werkstoff Nr 2.4600 Screws are manufactured from the European-designated Hastelloy B3 material and can be supplied in different head styles, dimensions, and thread configurations.
Hastelloy B3 Fasteners Chemical Composition
| Element | Typical / Specified Composition (%) |
|---|---|
| Nickel | Balance |
| Molybdenum | 28.0–32.0 |
| Chromium | 1.0–3.0 |
| Iron | 1.0–3.0 |
| Cobalt | Max. 3.0 |
| Tungsten | Max. 3.0 |
| Carbon | Max. 0.01 |
| Manganese | Max. 3.0 |
| Silicon | Max. 0.10 |
Mechanical Properties of Alloy B3 Fasteners
| Property | Typical Consideration |
|---|---|
| Tensile Strength | High strength for demanding fastening applications |
| Yield Strength | Depends on product condition |
| Elongation | Good ductility |
| Hardness | Depends on manufacturing and heat-treatment condition |
| Corrosion Resistance | Excellent in suitable reducing environments |
Hastelloy B3 Nuts and Bolts Weight Chart
| Fastener Size | Approx. Weight per 100 Pieces* |
|---|---|
| M6 × 20 mm | 0.20–0.30 kg |
| M8 × 25 mm | 0.45–0.60 kg |
| M10 × 30 mm | 0.85–1.10 kg |
| M12 × 40 mm | 1.40–1.80 kg |
| M16 × 50 mm | 3.00–3.80 kg |
| M20 × 60 mm | 5.50–6.80 kg |
| M24 × 80 mm | 10.00–12.50 kg |
| M30 × 100 mm | 18.00–22.00 kg |
| M36 × 120 mm | 30.00–36.00 kg |
| M42 × 140 mm | 42.00–50.00 kg |
| M48 × 160 mm | 58.00–68.00 kg |
Hastelloy B3 Equivalent Grades Chart
Hastelloy B3 is primarily identified by UNS N10675 and Werkstoff No. 2.4600. Equivalent designations should be treated carefully because different standards may define material requirements differently.
| Standard / Designation | Hastelloy B3 Equivalent |
|---|---|
| Alloy Name | Hastelloy B3 |
| UNS | N10675 |
| Werkstoff / W.Nr. | 2.4600 |
| EN Material Number | 2.4600 |
| Commercial Designation | Hastelloy B-3 / Alloy B3 |
| Nickel Alloy Family | Nickel-Molybdenum Alloy |
| ASTM Material Reference | ASTM B335* |
| ASME Material Reference | ASME SB574* |
*The ASTM/ASME specification must be matched to the specific product form. ASTM B335 and ASME SB574 should not automatically be treated as interchangeable finished-fastener standards.
Key Properties of Nickel Alloy B3 Fasteners
The primary reason engineers select Nickel Alloy B3 Fasteners is their corrosion resistance in aggressive chemical environments.
Key properties include:
- Excellent resistance to hydrochloric acid.
- Strong resistance to reducing chemical environments.
- Good resistance to pitting and localized corrosion.
- Good resistance to stress-corrosion cracking in suitable environments.
- High molybdenum content for improved corrosion performance.
- Good resistance to intergranular corrosion after welding and fabrication.
- Useful mechanical strength and ductility across demanding service conditions.
- Suitable for chemical-processing equipment and specialty industrial applications.
Applications of Hastelloy B3 Fasteners
Hastelloy B3 Fasteners are used where fasteners may be exposed to aggressive chemicals and reducing environments.
Common applications include:
- Chemical processing plants
- Hydrochloric acid processing equipment
- Petrochemical equipment
- Pharmaceutical processing systems
- Chemical reactors
- Heat exchangers
- Pressure vessels
- Piping and flange assemblies
- Scrubbers and pollution-control equipment
- Industrial tanks
- Process equipment
- Specialty corrosion-resistant machinery
The correct alloy should always be selected based on the actual chemical concentration, temperature, pressure, exposure time, and service conditions.
ASTM B335 Alloy B3 Bolts and ASME SB574 Studs
ASTM B335 Alloy B3 Bolts are associated with nickel-alloy plate, sheet, strip, and bar products, while ASME SB574 Hastelloy B3 Studs relates to nickel-alloy forgings used in demanding applications. The exact standard applicable to a finished fastener depends on its product form and procurement specification.
We can supply material documentation, dimensional inspection, chemical analysis, mechanical testing, and other inspection requirements when specified by the customer.
This helps buyers select fasteners based not only on the alloy name but also on the required product specification and quality requirements.
Hastelloy B3 Fasteners Dimensions & Standards
Fasteners can be supplied according to commonly required dimensional and threading standards, including:
- ASME B18.2.1
- ASME B18.2.2
- ASME B1.1
- ISO metric thread requirements
- DIN dimensional requirements
- Customer-specific drawings
- Project-specific dimensional specifications
Available dimensions depend on fastener type, diameter, length, thread configuration, and manufacturing method.
Related Hastelloy Fasteners Grades
What Makes Our Hastelloy B-3 Bolts the Right Choice?
When purchasing high-alloy fasteners, material traceability and specification compliance are as important as the alloy itself. We focus on:
- Material Traceability: Material Test Certificates can be provided for supplied products as required.
- Dimensional Accuracy: Fasteners are checked for dimensions, threads, head configuration, and other specified requirements.
- Custom Manufacturing: Non-standard sizes, special threads, lengths, and configurations can be manufactured according to drawings and requirements.
- Quality Inspection: Inspection and testing requirements can be arranged according to project specifications.
- Global Supply: We support industrial buyers, distributors, EPC contractors, and OEMs requiring corrosion-resistant nickel-alloy fasteners.
- Application Support: We help customers identify the appropriate fastener material, specification, size, and configuration according to the intended application.
Hastelloy B3 Fasteners Manufacturer & Supplier
As a Hastelloy B3 Fasteners Manufacturer and Supplier, we provide UNS N10675 Stud Bolts, UNS N10675 Hex Bolts, Hastelloy B3 Bolts and Nuts, screws, threaded rods, flange bolts, U-bolts, and other specialty fasteners.
Our supply capability covers standard and customized dimensions for chemical processing, industrial equipment, piping, pressure equipment, and other demanding applications.
For bulk requirements, we can provide technical documentation, inspection requirements, packaging, and export documentation according to the purchase order.
Request a Quote for Hastelloy B3 Fasteners
Need corrosion-resistant fasteners for a chemical-processing or industrial application?
Send us your required size, quantity, fastener type, applicable standard, and delivery requirements. We can help you select and source the appropriate Hastelloy B3 Fasteners with the required material and inspection documentation.
Get a quotation today for UNS N10675 bolts, nuts, stud bolts, threaded rods, screws, flange bolts, and U-bolts.
Frequently Asked Questions About Hastelloy B3 Fasteners
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