Description
Product Detail
Monel lap joint flanges are backing flanges designed to be used with a lap joint stub end, allowing the flange to rotate for easier bolt hole alignment during installation. Manufactured in nickel-copper Monel alloys, these flanges offer excellent resistance to seawater, alkalis, hydrofluoric acid and chloride-bearing media, making them suitable for offshore platforms, marine piping, chemical processing, desalination and oil and gas systems.
SASA FLANGE supplies Monel lap joint flanges in standard and customized dimensions according to ASME B16.5, ASME B16.47, EN 1092-1, DIN, JIS and GB requirements. 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 reliable material compliance for critical industrial projects.
- ✓Product Name: Monel Lap Joint Flange
- ✓Material Grade: Monel 400 UNS N04400, Monel K500 UNS N05500
- ✓Product Type: Nickel alloy lap joint backing flange for use with stub end
- ✓Main Feature: Excellent corrosion resistance, easy alignment, reusable flange connection design
- ✓Applications: Marine, offshore, chemical processing, desalination, oil and gas, power plants
Product Parameters
| Product Name | Monel Lap Joint Flange |
| Material Grade | Monel 400 (UNS N04400), Monel K500 (UNS N05500) |
| Material Type | Nickel-Copper Alloy Forging |
| Product Form | Forged and machined lap joint backing flange |
| Size Range | DN15 – DN1500 (1/2 inch – 60 inch) |
| Pressure Class | Class 150 – 2500 / PN6 – PN100 |
| Sealing Face | Flat face contact with lap joint stub end, compatible with RF type stub end assemblies |
| Surface Treatment | Machined, pickled, passivated, protective oil coating |
| 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, 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 general reference for common Monel grades used in lap joint flanges. Final composition shall comply with the applicable ASTM/ASME material standard, purchase specification and mill test certificate. Minor variations may occur depending on grade, melting practice and product form.
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|
| Monel 400 % | 0.30 max | 0.50 max | 2.00 max | – | 0.024 max | – | 63.0 min | – | Cu 28.0-34.0, Fe 2.5 max |
| Monel K500 % | 0.25 max | 0.50 max | 1.50 max | – | 0.01 max | – | 63.0 min | – | Cu 27.0-33.0, Al 2.30-3.15, Ti 0.35-0.85, Fe 2.0 max |
Mechanical Properties
Mechanical properties shown below are typical reference values for common Monel flange grades and may vary with heat treatment condition, forging reduction ratio, section thickness and applicable standard. Certified values should always be confirmed against the mill test certificate and relevant product specification for the supplied lot.
| Grade | Tensile Strength | Yield Strength | Elongation | Hardness | Density |
|---|---|---|---|---|---|
| Monel 400 | 480 MPa min | 170 MPa min | 35% min | 150 HB max | 8.80 g/cm3 |
| Monel K500 | 965 MPa min | 690 MPa min | 20% min | 345 HB max | 8.44 g/cm3 |
Common Size Table
| Size Range | Pressure Class | Sealing Face | Material | Availability |
|---|---|---|---|---|
| DN15 – DN50 | Class 150 – 600 | Lap Joint | Monel 400 | Stock / Production |
| DN65 – DN300 | Class 150 – 1500 | Lap Joint | Monel 400 / K500 | Stock / Production |
| DN350 – DN600 | Class 150 – 2500 | Lap Joint | Monel 400 / K500 | Production |
| DN700 – DN1500 | Class 150 – 900 | Lap Joint | Monel 400 | Made to Order |
Different Specifications Comparison
| Type | Description | Typical Use |
|---|---|---|
| ASME Lap Joint Flange | Rotating backing flange used with ASME stub end, suitable for inch-size piping | Oil and gas, process piping, offshore modules |
| EN Lap Joint Flange | European pattern lap joint flange manufactured to EN 1092-1 pressure ratings | Chemical plants, water treatment, industrial utilities |
| Loose Plate Flange with Stub End | Two-piece connection with separate stub end and backing flange for easier alignment | Corrosive lines where alloy stub end is required |
| Custom Drilled Lap Joint Flange | Non-standard drilling, thickness or bore adapted to project drawings | Replacement jobs, skid packages, OEM equipment |
Equivalent Standards and International Names
Monel lap joint flanges can be manufactured to major international flange standards, while the alloy material is generally supplied to ASTM/ASME nickel alloy forging standards. Equivalent naming may differ by region, but Monel 400 and Monel K500 are widely recognized nickel-copper alloy grades for corrosive service applications.
| Standard / Region | Standard Code | Typical Grade / Equivalent |
|---|---|---|
| USA | ASME B16.5 / ASME B16.47 | Monel 400 UNS N04400, Monel K500 UNS N05500 to ASTM B564 / ASME SB564 |
| Europe | EN 1092-1 | Nickel alloy lap joint flange in 2.4360 / alloy 400 equivalent project specification |
| Germany | DIN 2527 / 2566 | Loose flange / lap joint type in nickel-copper alloy equivalent to Monel 400 |
| Japan | JIS B2220 | Monel alloy lap joint flange to customer specified nickel-copper grade |
| China | GB/T 9119 | Nickel alloy lap joint flange, Monel 400 / K500 equivalent by project specification |
Production Process Flow
SASA FLANGE controls each manufacturing stage for Monel lap joint flanges to ensure alloy integrity, accurate dimensions and reliable fit-up with matching stub ends for demanding industrial piping systems.
- 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 or age hardening according to grade | 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 to verify that the supplied Monel alloy meets the required nickel, copper and alloying element limits of the specified grade. Test results are checked against ASTM or ASME requirements and recorded in the mill test certificate to ensure conformity before machining and final shipment.
2. Mechanical Properties Testing
Mechanical testing confirms tensile strength, yield strength, elongation and hardness in accordance with the applicable material specification. These tests help verify that Monel lap joint flanges can withstand service loads, assembly stresses and operating conditions, especially in corrosive and offshore environments where material integrity is essential.
3. Dimensional Inspection
Dimensional inspection covers outside diameter, bore, thickness, bolt circle, hole diameter, number of bolt holes and facing details. For lap joint flanges, accurate fit with the corresponding stub end is critical, so SASA FLANGE checks all dimensions carefully according to ASME, EN, DIN, JIS or GB standards.
4. PMI Testing and Hydrostatic Testing
PMI testing is performed to confirm the alloy grade and prevent material mix-up during production and dispatch. Hydrostatic testing is arranged when required as part of the assembled piping component or project requirement. EN 10204 3.1 certificate, inspection reports and traceable heat numbers are provided to support quality documentation.
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
Monel lap joint flanges are widely used in systems handling seawater, salt solutions, corrosive chemicals and aggressive process media. Their rotating backing flange design simplifies installation, while Monel alloy provides strong resistance to pitting, stress corrosion and general attack in many marine and chemical process environments.
| Industry | Typical Applications | Why This Product Is Used |
|---|---|---|
| Oil and Gas | Produced water lines, offshore utility piping, corrosive process connections | Offers corrosion resistance and easier alignment during maintenance |
| Chemical Processing | Alkali systems, acid handling lines, fluoride service and specialty process piping | Monel performs well in many aggressive chemical media |
| Power Generation | Auxiliary cooling water, condensate and chemical dosing systems | Reliable alloy performance and quick disassembly for service work |
| Water Treatment | Desalination plants, brine handling and seawater intake systems | Excellent resistance to seawater and chloride-bearing environments |
| Marine and Offshore | Shipboard piping, offshore platforms, firewater and seawater systems | Strong marine corrosion resistance with convenient lap joint assembly |
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 Monel lap joint flange?
A: A Monel lap joint flange is a rotating backing flange used together with a lap joint stub end. The flange itself does not form the sealing face; the stub end does. This design makes bolt alignment easier during installation and is especially useful in corrosive piping systems where Monel alloy is selected for improved service life.
Q: What materials are available for Monel lap joint flanges?
A: SASA FLANGE commonly supplies Monel 400 and Monel K500 lap joint flanges. Monel 400 is widely used for seawater and chemical resistance, while Monel K500 offers higher strength with similar corrosion performance in many environments. Material can be supplied according to ASTM B564 or ASME SB564 with full traceability and test documentation.
Q: What pressure class is supported?
A: Monel lap joint flanges are available in common pressure ratings including ASME Class 150, 300, 600, 900, 1500 and 2500, depending on size and project requirements. EN and DIN pressure ratings such as PN10, PN16, PN25, PN40, PN64 and PN100 can also be supplied for international piping systems and equipment packages.
Q: Can SASA FLANGE supply custom sizes?
A: Yes. SASA FLANGE can produce Monel lap joint flanges in custom dimensions, drilling patterns, bore sizes and special thicknesses according to customer drawings or project specifications. Matching stub ends, special facing details, non-standard pressure classes and mixed international standards can also be provided for OEM, replacement and turnkey project requirements.
Q: What certificate is provided?
A: SASA FLANGE provides EN 10204 3.1 material certificate with heat number traceability for Monel lap joint flanges. Additional documentation can include mill test certificate, chemical analysis, mechanical test results, dimensional inspection report and PMI records. Hydrostatic testing documentation can be arranged when required by the project, order specification or third-party inspection scope.
Contact Us
If you are looking for monel 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
