Description
Product Detail
Incoloy lap joint flanges are backing flanges designed to be used together with lap joint stub ends, allowing free rotation for easier bolt hole alignment and simplified maintenance. Manufactured from nickel-iron-chromium alloy grades, these flanges offer good resistance to oxidation, chloride environments, reducing and oxidizing media, making them suitable for chemical lines, offshore systems, heat exchangers, power plants and corrosive process piping.
SASA FLANGE supplies Incoloy lap joint flanges in standard and customized dimensions according to ASME, EN, 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 compliance for critical industrial projects.
- ✓Product Name: Incoloy Lap Joint Flanges
- ✓Material Grade: Incoloy 800/800H/800HT/825/925
- ✓Product Type: Lap Joint Flange / Loose Backing Flange
- ✓Main Feature: Excellent corrosion resistance with easy alignment and frequent dismantling capability
- ✓Applications: Oil and gas, chemical processing, power generation, marine, water treatment and heat exchanger systems
Product Parameters
| Product Name | Incoloy Lap Joint Flanges |
| Material Grade | Incoloy 800, 800H, 800HT, 825, 925 |
| Material Type | Nickel-Iron-Chromium Alloy / Nickel Alloy |
| Product Form | Forged lap joint flange, machined backing flange |
| Size Range | DN15 – DN1500 (1/2 inch – 60 inch) |
| Pressure Class | Class 150 – 2500 / PN6 – PN100 |
| Sealing Face | Flat face for use with lap joint stub end, RF type dimensions available by standard design |
| Surface Treatment | Natural machined, pickled, passivated, anti-rust protection 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, 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 based on common Incoloy grades used for lap joint flanges. Actual composition may vary by grade, product form and applicable ASTM or EN material standard. Final supplied composition will follow the approved material test certificate and relevant specification requirements.
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|
| Incoloy 825 | 0.05 max | 0.50 max | 1.00 max | 0.03 max | 0.03 max | 19.5-23.5 | 38.0-46.0 | 2.5-3.5 | Fe balance, Cu 1.5-3.0, Ti 0.6-1.2, Al 0.2 max |
Mechanical Properties
Mechanical properties shown below are typical reference values for common Incoloy grades used in forged flange production. Actual tensile strength, yield strength, elongation and hardness can vary according to grade, heat treatment condition, section thickness and applicable material standard. Certified test values are provided on the material certificate when required.
| Grade | Tensile Strength | Yield Strength | Elongation | Hardness | Density |
|---|---|---|---|---|---|
| Incoloy 800H | 450 MPa min | 170 MPa min | 30% min | 180HB max | 7.94 g/cm3 |
| Incoloy 825 | 550 MPa min | 220 MPa min | 30% min | 200HB max | 8.14 g/cm3 |
Common Size Table
| Size Range | Pressure Class | Sealing Face | Material | Availability |
|---|---|---|---|---|
| DN15 – DN50 | Class 150 – 600 | Lap Joint / Flat Face | Incoloy 800 / 825 | Stock / Production |
| DN65 – DN300 | Class 150 – 1500 | Lap Joint / Flat Face | Incoloy 800H / 825 / 925 | Stock / Production |
| DN350 – DN600 | Class 150 – 2500 | Lap Joint / Flat Face | Incoloy 800HT / 825 | Production |
| DN700 – DN1500 | Class 150 – 900 | Lap Joint / Flat Face | Incoloy 800 / 825 | Made to Order |
Different Specifications Comparison
| Type | Description | Typical Use |
|---|---|---|
| ASME Lap Joint Flange | Loose backing flange used with ASME short or long pattern stub end | Process piping, refinery lines, maintenance-intensive systems |
| EN Lap Joint Flange | European style lap joint flange matched to EN stub end dimensions | Chemical plants, water treatment and industrial utility piping |
| Forged Incoloy Lap Joint Flange | Forged alloy flange with improved structural integrity and dimensional consistency | High-corrosion and moderate to high pressure applications |
| Custom Drilled Lap Joint Flange | Special drilling, thickness or non-standard dimensions per project drawing | Offshore modules, skid packages and retrofit piping systems |
Equivalent Standards and International Names
Incoloy lap joint flanges can be produced to multiple international flange dimensions and drilling standards depending on project location and end-user specification. Equivalent grade naming may differ by region, while the base alloy is selected according to ASTM, ASME, EN or proprietary material requirements stated in the purchase order and MTC.
| Standard / Region | Standard Code | Typical Grade / Equivalent |
|---|---|---|
| USA | ASME B16.5 | Incoloy 800 / 800H / 825 to ASTM B564 or forged equivalent |
| Europe | EN 1092-1 | Nickel alloy lap joint flange in alloy 800H or 825 by project specification |
| Germany | DIN 2527 / 2566 | DIN lap joint type dimensions with Incoloy 800 or 825 material |
| Japan | JIS B2220 | JIS drilled lap joint flange in Incoloy 800 / 825 |
| China | GB/T 9119 | GB flange dimensions with UNS N08800 or N08825 alloy material |
Production Process Flow
SASA FLANGE controls each manufacturing stage from alloy raw material verification to final inspection and export packing. Strict process management helps ensure stable metallurgy, accurate dimensions, reliable fit-up with stub ends and documented traceability for industrial piping projects.
- 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 annealing as required by alloy 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 analysis is performed to confirm that the supplied Incoloy material meets the specified alloy grade such as 800H or 825. Key elements including nickel, chromium, molybdenum, titanium and copper are checked against the relevant standard. This inspection helps ensure corrosion resistance and material consistency before machining and shipment.
2. Mechanical Properties Testing
Mechanical testing verifies tensile strength, yield strength, elongation and hardness of the flange material in accordance with the applicable material specification. These tests confirm that the alloy has the required structural performance for pressure-containing piping systems. Test results are reviewed together with heat treatment records and included in project quality documents when specified.
3. Dimensional Inspection
Dimensional inspection covers outside diameter, thickness, bore, bolt circle, bolt hole diameter, number of holes and flange facing details. For lap joint flanges, fit-up compatibility with the stub end is especially important. SASA FLANGE checks dimensions against ASME, EN, DIN, JIS, GB or approved drawings to ensure proper installation on site.
4. PMI Testing and Hydrostatic Testing
Positive Material Identification is conducted to verify the alloy grade and prevent material mix-up in critical service environments. Hydrostatic testing can be arranged where project specifications require pressure integrity verification for assembled components or related flange systems. EN 10204 3.1 certificate, inspection records and traceability documents are supplied according to order requirements.
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
Incoloy lap joint flanges are selected for piping systems where corrosion resistance, easy assembly and repeated maintenance access are important. Their loose flange design simplifies alignment and reduces replacement cost because the wetted corrosion-resistant stub end contacts the process media while the backing flange provides mechanical support.
| Industry | Typical Applications | Why This Product Is Used |
|---|---|---|
| Oil and Gas | Produced water lines, offshore utility piping, sour service auxiliary systems | Offers corrosion resistance and easier dismantling during maintenance shutdowns |
| Chemical Processing | Acid transfer lines, reactor piping, fertilizer plants, scrubber systems | Incoloy alloys resist aggressive media and lap joint design eases inspection |
| Power Generation | Boiler auxiliary lines, flue gas desulfurization systems, heat exchanger piping | Suitable for elevated temperature service and corrosive condensate environments |
| Water Treatment | Desalination units, chemical dosing lines, high chloride water systems | Good resistance to chloride-bearing media with practical flange alignment |
| Marine and Offshore | Seawater systems, platform modules, firewater and cooling lines | Corrosion-resistant alloy helps improve reliability in saline environments |
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 an Incoloy lap joint flange?
A: An Incoloy lap joint flange is a loose backing flange used together with a lap joint stub end. The flange rotates freely around the stub end, making bolt hole alignment easier during installation. It is commonly used where piping needs regular dismantling or where corrosion-resistant alloy wetted parts are required in aggressive service.
Q: What materials are available for Incoloy lap joint flanges?
A: SASA FLANGE can supply Incoloy lap joint flanges in common nickel alloy grades including Incoloy 800, 800H, 800HT, 825 and 925, depending on service conditions and specification requirements. Grade selection is based on corrosion environment, operating temperature, pressure rating and compatibility with the mating stub end and piping material.
Q: What pressure class is supported?
A: These flanges are available in ASME Class 150, 300, 600, 900, 1500 and 2500, as well as PN-rated EN and DIN options such as PN10 to PN100 where applicable. The actual available pressure range depends on flange size, alloy grade, design standard and project specification for the connected piping system.
Q: Can SASA FLANGE supply custom sizes?
A: Yes. SASA FLANGE can manufacture custom Incoloy lap joint flanges according to project drawings or non-standard requirements. We support special drilling, customized thickness, special bore sizes, matching dimensions for short or long stub ends, and alternate flange standards. Special material grades and additional testing can also be arranged for critical applications.
Q: What certificate is provided?
A: SASA FLANGE provides EN 10204 3.1 material certificate for Incoloy lap joint flanges, together with MTC, dimensional inspection records and heat number traceability. PMI testing is available for alloy verification, and mechanical or hydrostatic testing can be supplied when required by the order, specification or end-user project quality plan.
Contact Us
If you are looking for incoloy 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
