Description
Product Detail
Hastelloy lap joint flanges are backing flanges designed to be used with a compatible stub end, allowing easy alignment and dismantling in piping systems handling highly corrosive media. Compared with integral flanges, the lap joint design reduces replacement cost in alloy piping because the flange does not contact the process fluid directly when matched with the correct stub end material. These flanges are widely used in chemical plants, offshore platforms, flue gas treatment, acid service and high-purity process lines.
SASA FLANGE supplies Hastelloy lap joint flanges in standard and customized dimensions according to ASME, EN, DIN, JIS, GB and project drawings. Each batch can be delivered with chemical analysis, mechanical testing, dimensional inspection, PMI testing, EN 10204 3.1 certificate and full heat number traceability to support critical industrial procurement requirements.
- ✓Product Name: Hastelloy Lap Joint Flanges
- ✓Material Grade: Hastelloy C22, C276, B2, C2000
- ✓Product Type: Lap Joint Flange / Loose Backing Flange
- ✓Main Feature: Excellent corrosion resistance with easy bolt hole alignment and economical maintenance
- ✓Applications: Chemical processing, acid service, offshore piping, power plants, marine and water treatment
Product Parameters
| Product Name | Hastelloy Lap Joint Flanges |
| Material Grade | Hastelloy C22, Hastelloy C276, Hastelloy B2, Hastelloy C2000 |
| Material Type | Nickel-based corrosion resistant alloy |
| Product Form | Forged flange, cut plate flange, machined loose flange for use with stub end |
| Size Range | DN15 – DN1500 (1/2 inch – 60 inch) |
| Pressure Class | Class 150 – 2500 / PN10 – PN100 |
| Sealing Face | Flat Face backing flange for use with lap joint stub end, custom facing on request |
| Surface Treatment | Pickling, passivation, machined finish, protective oil on machined surfaces |
| Standard | ASME B16.5, ASME B16.47, EN 1092-1, DIN, JIS B2220, GB/T 9119 or customer specification |
| Inspection | Chemical Analysis, Mechanical Test, PMI Test, Dimensional Inspection, Visual Inspection |
| Certificate | EN 10204 3.1 Material Certificate available |
| Processing Service | Cutting, CNC Machining, Custom Drilling, Custom Size Processing |
Chemical Composition
Chemical composition values below are for general reference for common Hastelloy flange grades. Actual composition depends on the selected alloy, melting route and applicable ASTM or ASME material specification. Final supply condition and exact chemistry shall conform to the approved material standard and the issued mill test certificate.
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|
| Hastelloy C276 | 0.01 max | 0.08 max | 1.00 max | 0.04 max | 0.03 max | 14.5-16.5 | Bal. | 15.0-17.0 | Fe 4.0-7.0, W 3.0-4.5, Co 2.5 max, V 0.35 max |
Mechanical Properties
Mechanical properties are typical reference values for commonly used Hastelloy flange materials in annealed condition. Actual tensile strength, yield strength, elongation and hardness can vary according to grade, product form, section thickness and heat treatment. Certified test results are supplied according to the governing material specification and project inspection requirements.
| Grade | Tensile Strength | Yield Strength | Elongation | Hardness | Density |
|---|---|---|---|---|---|
| Hastelloy C22 | 690 MPa min | 310 MPa min | 45% min | 95 HRB max | 8.69 g/cm3 |
| Hastelloy C276 | 690 MPa min | 283 MPa min | 40% min | 100 HRB max | 8.89 g/cm3 |
Common Size Table
| Size Range | Pressure Class | Sealing Face | Material | Availability |
|---|---|---|---|---|
| DN15 – DN50 | Class 150 – 600 | Lap Joint Backing Flange | Hastelloy C22 / C276 | Stock / Production |
| DN65 – DN300 | Class 150 – 1500 | Lap Joint Backing Flange | Hastelloy C22 / C276 / B2 | Stock / Production |
| DN350 – DN600 | Class 150 – 2500 | Lap Joint Backing Flange | Hastelloy C276 / C2000 | Production |
| DN700 – DN1500 | Class 150 – 900 | Lap Joint Backing Flange | Hastelloy C276 | Made to Order |
Different Specifications Comparison
| Type | Description | Typical Use |
|---|---|---|
| ASME Lap Joint Flange | Loose backing flange used with lap joint stub end under ASME B16.5 or B16.47 dimensions | Process piping in oil, gas, chemical and offshore systems |
| EN Lap Joint Flange | Lap joint flange to EN 1092-1 with PN pressure rating and metric dimensions | European industrial plants, water and chemical lines |
| Forged Hastelloy Lap Joint Flange | Machined from forged alloy blank for better structural integrity and dimensional control | High pressure, critical corrosion and project-grade service |
| Plate-Cut Hastelloy Lap Joint Flange | Produced from alloy plate and finish machined for larger diameters or custom designs | Low to medium pressure large-size piping and special fabrications |
Equivalent Standards and International Names
Lap joint flanges can be produced to multiple international dimensional standards, while the alloy material grade is selected separately according to ASTM or ASME nickel alloy specifications. Equivalent naming may vary by region, but UNS number and chemical composition are the most reliable references for procurement and technical approval.
| Standard / Region | Standard Code | Typical Grade / Equivalent |
|---|---|---|
| USA | ASME B16.5 | Hastelloy C276 / UNS N10276, Hastelloy C22 / UNS N06022 |
| Europe | EN 1092-1 | Ni-Cr-Mo alloy flange in C276 or C22 equivalent material |
| Germany | DIN 2527 / 2566 | Loose flange dimensions with alloy equivalent to 2.4819 / 2.4602 by project request |
| Japan | JIS B2220 | Hastelloy C276 or C22 equivalent nickel alloy flange |
| China | GB/T 9119 | NS3304 / NS334 equivalent project-grade nickel alloy flange |
Production Process Flow
SASA FLANGE controls each production stage from raw alloy verification to final marking. Process discipline is important for Hastelloy lap joint flanges because alloy chemistry, heat treatment, machining accuracy and traceability directly affect corrosion performance and field installation reliability.
- 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 alloy forging billets or plates | Material certificate, PMI verification and traceability |
| Forging | Hot forging or profile cutting to achieve required flange blank | Forging temperature, reduction ratio and grain flow control |
| Heat Treatment | Solution annealing or annealing as required by alloy grade | Temperature uniformity, holding time and cooling method |
| Machining | Sealing profile, bore, hub area, outside diameter and bolt holes | Dimensional accuracy, concentricity and surface finish |
| Inspection | Final inspection before shipment | Dimension, appearance, PMI, marking and document review |
Product Inspection
1. Chemical Composition Inspection
Chemical composition inspection is carried out to confirm that the supplied Hastelloy flange material matches the specified alloy grade such as C22 or C276. Test results are checked against the applicable ASTM or ASME standard limits for key elements including nickel, chromium, molybdenum, iron and tungsten to ensure corrosion resistance and material conformity.
2. Mechanical Properties Testing
Mechanical testing is performed in accordance with the applicable material specification to verify tensile strength, yield strength, elongation and hardness of the nickel alloy material. These tests confirm that the flange blank or forged material has the required structural properties for pressure service, fabrication reliability and stable performance under demanding operating conditions.
3. Dimensional Inspection
Dimensional inspection covers outside diameter, thickness, bore, bolt circle, bolt hole diameter, number of holes and overall tolerance according to ASME, EN, DIN, JIS or GB standards. For lap joint flanges, special attention is given to fit-up with the mating stub end, smooth rotation during alignment and correct flange face geometry for site installation.
4. PMI Testing and Hydrostatic Testing
PMI testing is available to verify alloy identity on each flange or batch using portable spectrometer or XRF equipment, helping avoid grade mix-up in critical service. Hydrostatic testing is generally applied to assembled piping or special flange components when specified. SASA FLANGE supplies EN 10204 3.1 certificate, inspection records and full traceability documentation with shipment.
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 lap joint flanges are selected for piping systems where severe corrosion resistance, reliable alignment and easier maintenance are required. Their loose flange construction is especially useful in alloy piping because it simplifies assembly and replacement while maintaining compatibility with corrosion-resistant stub ends in demanding industrial environments.
| Industry | Typical Applications | Why This Product Is Used |
|---|---|---|
| Oil and Gas | Sour service skids, offshore chemical injection lines, produced water systems | Resists aggressive media and allows easier flange alignment during maintenance |
| Chemical Processing | Acid handling, chlorides service, solvent lines, reactor and transfer piping | Excellent resistance to oxidizing and reducing chemicals with flexible assembly |
| Power Generation | FGD units, condensate treatment, emission control and chemical dosing systems | Withstands corrosive process streams and reduces downtime during replacement |
| Water Treatment | Desalination chemical dosing, brine systems and corrosion-prone treatment units | Good resistance to chloride-containing environments and aggressive chemicals |
| Marine and Offshore | Seawater treatment, offshore utility lines, scrubber systems and platform piping | Suitable for harsh marine conditions and easier bolt-hole orientation on site |
Why Choose SASA FLANGE?
- ✓Professional manufacturer of Lap Joint 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 lap joint flange?
A: A Hastelloy lap joint flange is a loose backing flange used together with a lap joint stub end. The flange can rotate around the stub end, making bolt hole alignment easier during installation. In corrosive alloy piping systems, this design can reduce cost and simplify maintenance because only the wetted stub end needs to match the process fluid.
Q: What materials are available for Hastelloy lap joint flanges?
A: SASA FLANGE can supply Hastelloy lap joint flanges in common nickel alloy grades including Hastelloy C22, Hastelloy C276, Hastelloy B2 and Hastelloy C2000. Material selection depends on the process medium, temperature, corrosion mechanism and project specification. We can also discuss equivalent UNS grades and matching stub end materials for complete assembly supply.
Q: What pressure class is supported?
A: We can supply Hastelloy lap joint flanges in ASME Class 150, 300, 600, 900, 1500 and 2500, as well as EN and other metric pressure ratings such as PN10 to PN100 depending on size and standard. Large diameter flanges can also be produced to ASME B16.47 or customer drawings for project-specific piping systems.
Q: Can SASA FLANGE supply custom sizes?
A: Yes. SASA FLANGE can manufacture custom Hastelloy lap joint flanges based on project drawings or non-standard requirements. We support special drilling patterns, custom outside diameter, special bore, matching dimensions for stub ends, metric or inch standards, and tailored marking. Custom machining and documentation packages are available for EPC, OEM and maintenance buyers.
Q: What certificate is provided?
A: Hastelloy lap joint flanges can be supplied with EN 10204 3.1 material certificate, mill test certificate, dimensional inspection report and PMI test results. Additional documentation can be arranged according to order requirements. Where specified, we also support third-party inspection, hardness or mechanical test records, heat number traceability and complete shipping marking for project control.
Contact Us
If you are looking for hastelloy lap joint 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
