Incoloy 800HT Flat Face Flanges are forged nickel-iron-chromium alloy (enhanced creep strength) flanges made from UNS N08811 / W.Nr. 1.4959 material, typically supplied to ASTM B564 material requirements and ASME B16.5 dimensional standards in pressure classes 150# – 300#. Ragnar Metals & Tubes manufactures and exports these flanges with FF facing options, EN 10204 3.1/3.2 documentation, and third-party inspection on request.
Ragnar Metals & Tubes is a 800HT Flat Face Flange Supplier and manufacturer of Incoloy 800HT (UNS N08811) flat face flanges to ASTM B564 and applicable ASME flange dimensional standards, with common sizes and classes available from stock, subject to current inventory, for export and EPC orders.
A flat face flange has a sealing surface that lies flush with the bolt circle, rather than raised above it, so the full gasket face makes contact across the entire flange. Flat facing is commonly specified when mating to cast iron or other more brittle flanged equipment, since a raised face can concentrate bolt-load stress on a brittle mating flange and risk cracking it.
Incoloy 800HT is a nickel-iron-chromium alloy (enhanced creep strength) (UNS N08811) known for a tightened aluminum-plus-titanium range versus 800/800H for the best creep and stress-rupture strength in the family at sustained high temperature.
UNS Number
Grade
Flange Type
Standard
MTC
Inspection
Origin
Export
| Class | Standard | Typical Facing |
|---|---|---|
| 150 | ASME B16.5 | RF / FF / RTJ |
| 300 | ASME B16.5 | RF / FF / RTJ |
| 600 | ASME B16.5 | RF / RTJ |
| 900 | ASME B16.5 | RF / RTJ |
| 1500 | ASME B16.5 | RF / RTJ |
| 2500 | ASME B16.5 | RF / RTJ |
Not every class/size combination applies to every flange type. Pressure-temperature ratings must be selected against the applicable ASME rating tables and actual design conditions.
Send us your size, class and quantity — we'll come back with pricing and lead time.
The Middle East and Indian sub-continent are home to hundreds of metal suppliers ranging from small trading shops to large ISO-certified manufacturers. International buyers typically evaluate a supplier on quality compliance, production capability, export experience and pricing transparency before placing a bulk order.
Sealing face flush with the bolt circle, not raised
Reduces bending stress concentration on a mating flange
Commonly used when bolting to cast iron equipment
Uses a full-face gasket covering the entire flange face
Typically limited to lower pressure classes
Manufactured from Incoloy 800HT (UNS N08811) for a tightened aluminum-plus-titanium range versus 800/800H for the best creep and stress-rupture strength in the family at sustained high temperature
| Product | Composition | Usage | Standards |
|---|---|---|---|
| Incoloy 800HT Flat Face Flange – Standard Class | UNS N08811 | General process piping | ASME B16.5 |
| Incoloy 800HT Flat Face Flange – High Pressure | UNS N08811 | High-pressure / critical service | ASME B16.5 |
| Specification | Details |
|---|---|
| UNS Number | N08811 |
| Grade | 800HT |
| Flange Type | Flat Face Flange |
| Standard | ASTM B564 / ASME B16.5 |
| Werkstoff Number | 1.4959 |
| Pressure Class | 150# – 300# |
| Facing | FF |
| Size (mm) | Size (mm) |
|---|---|
| 15 | 20 |
| 25 | 32 |
| 40 | 50 |
| 65 | 80 |
| 100 | 125 |
| 150 | 200 |
| 250 | 300 |
| 350 | 400 |
| 450 | 500 |
| 600 |
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 30.0 – 35.0 |
| Chromium (Cr) | 19.0 – 23.0 |
| Iron (Fe) | 39.5 Min |
| Aluminum + Titanium (Al+Ti) | 0.85 – 1.20 |
| Carbon (C) | 0.06 – 0.10 |
| Property | Value |
|---|---|
| Tensile Strength | 450 MPa Min (annealed) |
| Yield Strength (0.2%) | 170 MPa Min |
| Elongation | 30% Min |
| Grain Size | ASTM No. 5 or coarser |
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.94 g/cm³ | 0.287 lb/in³ |
| Melting Point | 1357 – 1385 °C | 2475 – 2525 °F |
| Value (µΩ·m) | Temperature (°C) | Condition |
|---|---|---|
| 0.99 | 20 | Annealed |
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| UNS | 1.4959 | N08811 |
| ASTM / ASME | B564 / SB564 | N08811 |
| Common Trade Name | Incoloy 800HT | N08811 |
Forged Incoloy 800HT billets are pressed into flange blanks, solution annealing to restore corrosion resistance and mechanical properties, then CNC-machined to the required class, bore and facing.
| Process | Temperature | Medium | Purpose |
|---|---|---|---|
| Solution Annealing | 1149°C Min | Air or Water Quench | Develop controlled grain size and Al+Ti response for maximum creep strength |
Not sure of every specification? Send your drawing, BOQ or existing part photo and our team can review the requirement.
1/2" – 24" NB · Forged, FF facing
Mating to cast iron / brittle equipment
High-temperature furnace and reformer components under sustained load
Ethylene cracking furnace hardware
Radiant tube supports
Heat-treatment fixtures under continuous high-temperature service
Connections to cast iron pumps, valves or equipment
Lower-pressure piping where a full-face gasket is preferred
| Property | Incoloy 800HT | Incoloy 800H |
|---|---|---|
| Alloy Family | Nickel-Iron-Chromium Alloy (Enhanced Creep Strength) | Nickel-Iron-Chromium Alloy (Controlled Carbon/Grain Size) |
| UNS / Werkstoff | N08811 / 1.4959 | N08810 / 1.4958 |
800HT's tighter Al+Ti range gives it an edge in creep-rupture strength over 800H; 800H is generally the more economical choice when the extra margin isn't required.
| Size | Price (USD) | Price (INR) |
|---|---|---|
| 1/2" – 2" NB, 150# | $18 – $40 / pc | ₹1,500 – ₹3,300 / pc |
| 4" – 8" NB, 300# | $70 – $250 / pc | ₹5,800 – ₹20,750 / pc |
| 10" – 24" NB, 600# | $350 – $1,600 / pc | ₹29,000 – ₹1,33,000 / pc |
Indicative only — actual price depends on size, class, quantity and market rates. Request current pricing above.
Common sizes and standard pressure classes may be available from stock, subject to current inventory. Non-standard sizes, higher pressure classes and project-specific inspection requirements are manufactured or sourced against confirmed orders. Contact us for current stock status and lead time.
MOQ: 25 – 100 Kg / pieces depending on grade, size and product form.
Payment: T/T (bank transfer), Letter of Credit (LC at sight or usance), and SWIFT transfer, depending on order value and buyer requirements.
All export orders are packed in seaworthy, fumigated wooden crates with waterproof inner lining, or palletised packing with clear shipping marks and heat-number identification for full traceability.
Container stuffing is supervised and loading photographs are shared on request, along with certificates of origin, mill test certificates and packing lists for smooth customs clearance at destination ports.
Every Incoloy 800HT Flat Face Flange is checked for chemistry, tensile strength, hardness and dimensions before dispatch. PMI, radiography and third-party inspection (TUV, BV, SGS, Lloyd's) are available on request, with EN 10204 3.1/3.2 certification.
Documents listed are available on request; not every document applies to every order.
NPS / DN size
Pressure class
Quantity
Facing
Pipe schedule / bore
Material / standard requirement
MTC requirement
Third-party inspection requirement
Delivery location
Required delivery date
Don't know all the specifications? Send your drawing, BOQ or existing part photo and our team can review the requirement.
800HT Flat Face Flange Manufacturer — full mill traceability with every order
800HT Flat Face Flange Exporter — export documentation and seaworthy packing for every shipment
800HT Flat Face Flange Stockist — common classes and sizes available from stock, subject to inventory
800HT Flat Face Flange Distributor — dedicated support for EPC contractors and trading partners
20+ years exporting nickel and specialty alloy flanges
ISO certified quality systems
Incoloy 800HT sourced and tested to ASTM B564
Mumbai, Delhi, Pune, Chennai, Hyderabad, Bengaluru, Ahmedabad, Rajkot, Coimbatore, Kolkata, Surat, Vadodara
For buyers searching for a 800HT Flat Face Flange in UAE, Ragnar Metals & Tubes is an India-based manufacturer and exporter supplying Incoloy 800HT Flat Face Flanges to buyers and EPC contractors in the UAE, Saudi Arabia, Qatar, Oman, Kuwait and Bahrain, with export documentation and seaworthy packing for every shipment.
UAE, Saudi Arabia, Qatar, Oman, Kuwait, Bahrain, USA, UK, Germany, South Africa, Australia, Malaysia
ISO 9001:2015
ISO 10002:2018
GST Registration
Udyam Registration
Before placing an order, confirm:
Don't know the exact specification yet? Send your BOQ or drawing and we'll confirm it with you.
Send us your size, class and quantity — we'll come back with pricing and lead time.
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A flat face flange has a sealing surface that lies flush with the bolt circle, rather than raised above it, so the full gasket face makes contact across the entire flange.
150# – 300# per ASME B16.5, depending on size and facing.
Yes, EN 10204 3.1 as standard; 3.2 third-party certification on request.
FF.
Yes, we regularly export to the UAE, Saudi Arabia, Qatar, Oman, Kuwait and Bahrain.
Yes, through TUV, BV, SGS or Lloyd's before dispatch.
The material is supplied to ASTM B564 (UNS N08811); dimensions follow the applicable ASME flange dimensional standard, including ASME B16.5 and, for larger sizes, ASME B16.47.
Size (NPS/DN), pressure class, facing, quantity, MTC and inspection requirements, and delivery location.
Yes, a sample Material Test Certificate can be shared on request to confirm our documentation format.
Flat facing distributes bolt-load stress evenly across a mating flange, which matters when bolting to cast iron or other equipment that could crack under the concentrated stress a raised face can create.
Incoloy 800HT offers a tightened aluminum-plus-titanium range versus 800/800H for the best creep and stress-rupture strength in the family at sustained high temperature.
Yes — Incoloy 800HT Flat Face Flanges in UNS N08811 are exactly what we manufacture and export; share your size, class and quantity and we'll quote directly.
