Description
Product Detail
Hastelloy B2 long weld neck flanges are specialty forged alloy flanges featuring an extended tapered hub that provides improved stress distribution, stronger reinforcement at the nozzle connection and reliable performance in high-pressure or temperature-varying systems. This flange type is commonly selected for reactor nozzles, pressure vessels, corrosive transfer lines and critical process piping in chemical, petrochemical and offshore applications where resistance to hydrochloric acid and other reducing media is required.
SASA FLANGE supplies Hastelloy B2 long weld neck flanges in standard and custom dimensions according to ASME, EN, DIN, JIS, GB or project drawings. Each order can be supported by chemical analysis, mechanical testing, dimensional inspection, PMI testing, EN 10204 3.1 certificate and full heat number traceability to ensure compliance with demanding industrial procurement and EPC documentation requirements.
- ✓Product Name: Hastelloy B2 Long Weld Neck Flange
- ✓Material Grade: ASTM B564 UNS N10665 / Hastelloy B2
- ✓Product Type: Forged nickel alloy long weld neck flange
- ✓Main Feature: Excellent corrosion resistance in reducing acid service with reinforced long hub design
- ✓Applications: Chemical processing, acid handling, pressure vessels, offshore systems, specialty piping
Product Parameters
| Product Name | Hastelloy B2 Long Weld Neck Flange |
| Material Grade | ASTM B564 UNS N10665, Hastelloy B2 |
| Material Type | Nickel-Molybdenum Alloy |
| Product Form | Forged / machined long weld neck flange |
| Size Range | DN15 – DN1500 (1/2 inch – 60 inch) |
| Pressure Class | Class 150 – 2500 / PN10 – PN100 |
| Sealing Face | RF, FF, RTJ, TG, MFM |
| Surface Treatment | Pickling, passivation, machined finish, protective oil, custom preservation for export |
| Standard | ASME B16.5, ASME B16.47, EN 1092-1, DIN, JIS, GB or customer specification |
| Inspection | Chemical Analysis, Mechanical Test, PMI Test, Dimensional, Hydrostatic |
| Certificate | EN 10204 3.1 Material Certificate available |
| Processing Service | Cutting, CNC Machining, Custom Drilling, Custom Size Processing |
Chemical Composition
The following chemical composition is for reference for Hastelloy B2 forged material. Actual values may vary slightly by mill heat, product form and applicable specification. Final chemical composition shall comply with ASTM requirements and be confirmed by the material test certificate and project inspection documents supplied with the order.
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|
| Content % | 0.02 max | 0.10 max | 1.00 max | 0.04 max | 0.03 max | 1.00 max | Balance | 26.0-30.0 | Fe 2.0 max, Co 1.0 max |
Mechanical Properties
Mechanical properties shown below are typical reference values for Hastelloy B2 and project-specified equivalent forged alloy grades. Actual results may vary according to heat treatment condition, section thickness and manufacturing route. Final acceptance values should be based on the applicable ASTM material standard, purchase specification and certified test reports.
| Grade | Tensile Strength | Yield Strength | Elongation | Hardness | Density |
|---|---|---|---|---|---|
| Hastelloy B2 / UNS N10665 | 760 MPa | 350 MPa | 40% min | 100 HRB max | 9.24 g/cm3 |
| Alloy B2 Forged Condition | 750 MPa | 340 MPa | 40% min | 100 HRB max | 9.24 g/cm3 |
Common Size Table
| Size Range | Pressure Class | Sealing Face | Material | Availability |
|---|---|---|---|---|
| DN15 – DN50 | Class 150 – 600 | RF | Hastelloy B2 / UNS N10665 | Stock / Production |
| DN65 – DN300 | Class 150 – 1500 | RF / RTJ | Hastelloy B2 / UNS N10665 | Stock / Production |
| DN350 – DN600 | Class 150 – 2500 | RF / RTJ | Hastelloy B2 / UNS N10665 | Production |
| DN700 – DN1500 | Class 150 – 900 | RF | Hastelloy B2 / UNS N10665 | Made to Order |
Different Specifications Comparison
| Type | Description | Typical Use |
|---|---|---|
| ASME Long Weld Neck Flange | Extended hub flange machined to ASME dimensions with butt weld end for vessel or nozzle transition | Pressure vessels, high-stress nozzles, process piping |
| RTJ Long Weld Neck Flange | Long weld neck flange with ring type joint groove for high-pressure sealing service | High-pressure chemical lines, reactor connections, refinery units |
| RF Long Weld Neck Flange | Raised face version suitable for standard gasketed joints and corrosive process systems | General corrosive service, pump and equipment connections |
| Custom Forged Long Weld Neck Flange | Project-made flange produced to vessel neck dimensions, wall thickness and drilling pattern | EPC projects, pressure vessel fabrication, custom skids |
Equivalent Standards and International Names
Long weld neck flange dimensional standards differ by region, while the alloy grade is normally specified by ASTM or UNS designation for international procurement. Hastelloy B2 is commonly ordered as UNS N10665 forged material and manufactured to the required flange standard, drilling pattern and facing type according to project documentation.
| Standard / Region | Standard Code | Typical Grade / Equivalent |
|---|---|---|
| USA | ASME B16.5 | ASTM B564 UNS N10665 / Hastelloy B2 |
| Europe | EN 1092-1 | UNS N10665 nickel alloy to project specification |
| Germany | DIN 2527 / 2566 | Hastelloy B2 equivalent alloy by drawing or material callout |
| Japan | JIS B2220 | UNS N10665 forged nickel alloy flange |
| China | GB/T 9119 | NS3202 / UNS N10665 project equivalent |
Production Process Flow
SASA FLANGE controls each manufacturing stage from raw material verification to final packing to ensure dimensional accuracy, alloy integrity and complete traceability for Hastelloy B2 long weld neck flanges used in demanding corrosive service.
- 1. Raw Material Selection
- 2. Forging / Cutting
- 3. Heat Treatment
- 4. Rough Machining
- 5. Finish Machining
- 6. Drilling
- 7. Surface Treatment
- 8. Inspection
- 9. Marking
- 10. Packing
- 11. Delivery
| Process Step | Description | Quality Control Point |
|---|---|---|
| Raw Material | Select certified forging billets or plates | Material certificate and traceability |
| Forging | Hot forging to achieve required shape | Forging temperature and reduction ratio |
| Heat Treatment | Solution annealing and controlled cooling for nickel alloy stability | Temperature and holding time control |
| Machining | Sealing face, bolt holes, dimensions | Dimensional accuracy and surface finish |
| Inspection | Final inspection before shipment | Dimension, surface, PMI, hydrostatic |
Product Inspection
1. Chemical Composition Inspection
Chemical composition inspection is carried out on the Hastelloy B2 raw material and, where required, on the finished flange to verify compliance with UNS N10665 requirements. Key elements such as nickel, molybdenum, chromium, iron and carbon are checked against ASTM limits. This process helps confirm corrosion-resistant performance and prevents off-grade alloy substitution in critical project supply.
2. Mechanical Properties Testing
Mechanical properties testing verifies that forged Hastelloy B2 material achieves the specified tensile strength, yield strength, elongation and hardness after heat treatment. Test samples are reviewed according to relevant ASTM requirements or project specifications. These tests confirm the flange has sufficient structural integrity for pressure-retaining service, welded assemblies and demanding nozzle or vessel connections.
3. Dimensional Inspection
Dimensional inspection covers outside diameter, bore, hub length, long neck profile, thickness, bolt circle, bolt hole diameter and facing geometry. Raised face or RTJ groove dimensions are checked carefully to ensure gasket compatibility and correct assembly. This inspection is especially important for long weld neck flanges used on vessels and equipment where transition dimensions must match design drawings precisely.
4. PMI Testing and Hydrostatic Testing
PMI testing is performed using portable analyzers to confirm the alloy identity of Hastelloy B2 before shipment. When specified, hydrostatic or assembly pressure testing is arranged to verify pressure integrity in finished systems or special fabricated components. SASA FLANGE can provide EN 10204 3.1 certificate, material test reports, inspection records and traceable heat numbers with the delivered flanges.
Product Packaging
- ✓Wooden Case Packaging: Suitable for high-pressure and large-diameter products
- ✓Pallet Packing with Shrink Wrap: Suitable for batch shipments and standard sizes
- ✓Anti-rust Oil Coating + Waterproof Paper: Used for ocean freight protection
- ✓Individual Plastic Bag + Carton: Used for small fittings and threaded products
- ✓Clear Marking: Grade, size, pressure class, heat number and PO number
Applications
Hastelloy B2 long weld neck flanges are selected for corrosive process systems where excellent resistance to reducing acids and reliable structural reinforcement are required. Their long tapered hub makes them suitable for critical nozzle and vessel connections in industries that demand alloy integrity, dimensional precision and documented traceability.
| Industry | Typical Applications | Why This Product Is Used |
|---|---|---|
| Oil and Gas | Acid injection systems, specialty chemical lines, offshore process modules | Provides corrosion resistance in aggressive media and strong reinforcement for critical welded connections |
| Chemical Processing | Hydrochloric acid service, reactors, evaporators, storage and transfer piping | Hastelloy B2 offers excellent resistance to reducing environments and low carbon content supports weldability |
| Power Generation | FGD auxiliary systems, chemical dosing skids, specialty boiler island services | Used where alloy durability and pressure boundary reliability are needed in corrosive auxiliary systems |
| Water Treatment | Chemical dosing plants, acid regeneration units, demineralization support systems | Suitable for severe chemical handling duties where standard stainless steel may not perform adequately |
| Marine and Offshore | Offshore chemical injection, topside process piping, FPSO specialty service lines | Combines corrosion-resistant alloy performance with long neck geometry for robust nozzle and piping transitions |
Why Choose SASA FLANGE?
- ✓Professional manufacturer of Long Weld Neck Flange for global industrial projects
- ✓Customized size, pressure class and material grade according to drawings
- ✓Full standard support: ASME, EN, DIN, JIS, GB, GOST and customer specifications
- ✓Material traceability with heat number control and EN 10204 3.1 material certificate
- ✓Chemical analysis, mechanical testing, PMI testing, hydrostatic and dimensional inspection
- ✓Stock availability for standard items, lead time 3-7 days; custom production 15-30 days
- ✓Export-grade packaging for sea, air and land transportation
- ✓15+ years experience supplying 50+ countries worldwide
FAQ
Q: What is a Hastelloy B2 long weld neck flange?
A: A Hastelloy B2 long weld neck flange is a forged nickel-molybdenum alloy flange with an extended tapered hub designed for high-stress welded connections. It is commonly used on pressure vessels, columns, reactors and critical piping systems. The long neck improves stress distribution and makes it suitable for corrosive service involving reducing acids and demanding process conditions.
Q: What materials are available for Hastelloy B2 long weld neck flanges?
A: The main material is ASTM B564 UNS N10665, commonly known as Hastelloy B2. For project requirements, SASA FLANGE can also discuss equivalent nickel alloy grades or related corrosion-resistant forged materials based on application conditions, design code and client drawings. Material selection depends on process chemistry, temperature, pressure and required certification for the final installation.
Q: What pressure class is supported?
A: SASA FLANGE can supply Hastelloy B2 long weld neck flanges in ASME Class 150, 300, 600, 900, 1500 and 2500, with EN and other regional ratings produced to project requirements. The available class depends on size, design thickness, facing type and forging feasibility. Higher pressure ratings are commonly manufactured as custom items according to approved drawings.
Q: Can SASA FLANGE supply custom sizes?
A: Yes. SASA FLANGE supplies custom long weld neck flanges according to client drawings, vessel nozzle dimensions and project standards. We can manufacture non-standard neck lengths, special bores, custom drilling patterns, RTJ or raised face details, special hub transitions and tailored material grades. This is particularly useful for EPC projects, pressure vessels and replacement parts with exact fit requirements.
Q: What certificate is provided?
A: SASA FLANGE provides EN 10204 3.1 material certificate with heat number traceability for Hastelloy B2 long weld neck flanges. Supporting documentation can include chemical analysis, mechanical test results, dimensional inspection records and PMI reports. Hydrostatic testing or additional third-party inspection can also be arranged when specified by the purchase order, contract documents or project quality plan.
Contact Us
If you are looking for hastelloy b2 flanges or related custom flange products, please contact SASA FLANGE with your required size, pressure class, material grade, standard, surface treatment, quantity and inspection requirements. Our team will provide professional technical solutions and competitive quotation within 24 hours.
- 📧 Email: sales@sasaflange.com
- 📱 WhatsApp: +86 13764965049
- ☎️ Tel: +86 21 52236361
- 🌐 Website: www.sasaflange.com
