Incoloy 825 Flanges Manufacturer & Supplier in India
Incoloy 825 flanges are made of a nickel iron chromium alloy enriched with molybdenum, copper, and titanium, giving this material exceptional resistance to corrosive environments. These flanges are able to withstand various hostile industrial environments where resistance to oxidation, reducing acids and chloride induced corrosion is crucial. Flanges made from this alloy are frequently referred to as UNS N08825 flanges (Werkstoff Nr. It complies with ASTM designation ASTM C1159 (2.4858) and is suitable for harsh chemical, marine applications and piping systems.
ASTM B564 Incoloy 825 flanges come in a range of different styles to fit various piping systems such as Incoloy 825 weld neck flanges, Incoloy 825 slip on flanges, Incoloy 825 blind flanges, Incoloy 825 socket weld flanges, Incoloy 825 threaded flanges, and lap joint flanges. These flanges are manufactured per ASME B16.5, ANSI, DIN & EN standards for secure and leak free connections for high pressure and high temperature systems. The “balanced” chemistry of Alloy 825 flanges makes them highly resistant to pitting, crevice corrosion and stress corrosion cracking and will provide service in chemical processing plants, seawater and acid production systems.
Kalpataru Piping Solution is one of the trusted manufacturers and Incoloy 825 flange suppliers in India who has been serving since 15 years and more in this industry and supply high quality flanges from 1/2” to 48”. Our ASTM B564 UNS N08825 flanges are produced from high quality raw materials and are inspected and tested to high quality standards such as mill test certificate and third party inspection. For the wider Incoloy / Inconel flange range, see our Incoloy 825 Flanges hub or browse related Inconel 625 Flanges.
- Incoloy 825 Flanges Specifications
- Types of Incoloy 825 Flanges Available
- Equivalent Material Grades of Incoloy 825 Flanges
- Chemical Composition of Incoloy 825 Flanges
- Incoloy 825 Flanges Size & Stock Availability
- HS Code of WNR 2.4858 Incoloy 825 Flanges
- Incoloy 825 Flanges Dimension Table (ASTM B564 / ASME B16.5)
- Testing & Inspection of Alloy 825 Flanges
- DIN 2.4858 Incoloy 825 Flange Type Codes
- Temperature & Pressure Rating of Incoloy 825 Flanges (Class 150/300)
- Common Applications of Incoloy 825 Flanges
- Mechanical Properties of ASTM B564 Incoloy 825 Flanges
- Physical Properties of Alloy 825 Orifice & Reducing Flanges
- Other Available Stock of ASTM B564 Incoloy 825 Flanges
- FAQ’s About Incoloy 825 Flanges
Incoloy 825 Flanges Specifications
Specification | Details |
Standards | ASTM B564 / ASME SB564 |
Dimensions | ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API 605, AWWA, custom drawings |
Size Range | 1/2 inch (15 NB) to 48 inch (1200 NB) |
Pressure Ratings | 150 lb, 300 lb, 600 lb, 900 lb, 1500 lb, 2500 lb, PN6, PN10, PN16, PN25, PN40, PN64 |
Flange Face Type | Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ), Lap Joint Face (LJF), Male and Female (MF), Tongue and Groove |
Standards Covered | ASTM, ASME, ANSI, DIN, EN, BS, JIS |
HS Code | 73079190 (nickel alloy fittings and flanges) – confirm with your export documentation team |
Types of Incoloy 825 Flanges Available
Incoloy Alloy 825 Flanges are available in the following types (existing product photography to be retained for each):
- Weld Neck Flanges: Designed for high pressure applications with a long tapered hub that provides reinforcement and smooth flow transition. Ideal for critical services in chemical plants and refineries.
- Slip On Flanges: Cost effective option that slides over the pipe end before welding. Suitable for low pressure applications and systems requiring easy assembly.
- Blind Flanges: Used to close off pipe ends, valves, or pressure vessel openings. Essential for system testing, inspection access, and future expansion points.
- Socket Weld Flanges: Provide smooth bore and high structural strength for small diameter, high pressure piping systems. Common in hydraulic and instrumentation lines.
- Threaded Flanges: Feature internal threads for pipe connection without welding. Used in low pressure applications or where welding is restricted.
- Lap Joint Flanges: Used with stub ends for systems requiring frequent dismantling or where flange rotation is needed for bolt hole alignment.
- Orifice Flanges: Specialised flanges with pressure taps for flow measurement using orifice plates. Critical for process control and monitoring applications.
Equivalent Material Grades of Incoloy 825 Flanges
Standard | Werkstoff Nr. | UNS | AFNOR | GOST | JIS | BS | EN |
Incoloy 825 | 2.4858 | N08825 | NC 21 FeDU | XH38BT | NCF 825 | NA 16 | NiCr21Mo |
Chemical Composition of Incoloy 825 Flanges
Grade | Ni (%) | Cr (%) | Fe (%) | Mo (%) | Cu (%) | Ti (%) | C max | Mn max | Si max | S max | |
Incoloy 825 | 38.0-46.0 | 19.5-23.5 | 22.0-31.0 (bal) | 2.5-3.5 | 1.5-3.0 | 0.6-1.2 | 0.05 | 1.0 | 0.5 | 0.03 | |
Incoloy 825 Flanges Dimension and Bolt Pattern Chart (ASME B16.5, Class 150)
Dimensions in inches. Rows re-sorted in ascending NPS order.
NPS (inches) | No. of Bolts | Bolt Dia (inches) | Bolt Circle Dia (inches) | Flange Dia (inches) | Bolt Hole Dia (inches) |
1/4 | 4 | 1/2 | 2-1/4 | 3-3/8 | 0.62 |
1/2 | 4 | 1/2 | 2-5/8 | 3-3/4 | 0.62 |
3/4 | 4 | 5/8 | 3-1/4 | 4-5/8 | 0.75 |
1 | 4 | 5/8 | 3-1/2 | 4-7/8 | 0.75 |
1-1/4 | 4 | 5/8 | 3-7/8 | 5-1/4 | 0.75 |
1-1/2 | 4 | 3/4 | 4-1/2 | 6-1/8 | 0.88 |
2 | 8 | 5/8 | 5 | 6-1/2 | 0.75 |
2-1/2 | 8 | 3/4 | 5-7/8 | 7-1/2 | 0.88 |
3 | 8 | 3/4 | 6-5/8 | 8-1/4 | 0.88 |
3-1/2 | 8 | 3/4 | 7-1/4 | 9 | 0.88 |
4 | 8 | 3/4 | 7-7/8 | 10 | 0.88 |
5 | 8 | 3/4 | 9-1/4 | 11 | 0.88 |
6 | 12 | 3/4 | 10-5/8 | 12-1/2 | 0.88 |
8 | 12 | 7/8 | 13 | 15 | 1.00 |
10 | 16 | 1 | 15-1/4 | 17-1/2 | 1.12 |
12 | 16 | 1-1/8 | 17-3/4 | 20-1/2 | 1.25 |
14 | 20 | 1-1/8 | 20-1/4 | 23 | 1.25 |
16 | 20 | 1-1/4 | 22-1/2 | 25-1/2 | 1.38 |
18 | 24 | 1-1/4 | 24-3/4 | 28 | 1.38 |
20 | 24 | 1-1/4 | 27 | 30-1/2 | 1.38 |
24 | 24 | 1-1/2 | 32 | 36 | 1.62 |
Incoloy 825 Flanges Size & Stock Availability
Standard | Size Range | Pressure Class | Flange Types |
ASME B16.5 | 1/2 inch to 24 inch | 150 to 2500 lb | Weld Neck, Socket Weld, Slip On, Blind, Lap Joint, Orifice, Tongue and Groove, Spectacle, Plate |
ASME B16.47 / API 605 | 26 inch to 60 inch | 300 to 2500 lb | Weld Neck, Slip On, Blind, RTJ |
ASME / ANSI B16.36 | 1 inch to 24 inch | 150 to 2500 lb | Weld Neck, Socket Weld, Blind |
ASME B16.48 / API 590 | 1/2 inch to 24 inch | 150 to 900 lb | Spectacle, Plate, Lap Joint |
MSS SP-44 | 12 inch to 60 inch | 150 to 600 lb | Weld Neck, Slip On |
BS 3293 | 26 inch to 48 inch | 2000 to 20000 psi | Weld Neck, Blind |
API 6A | 2-1/16 inch to 30 inch | PN6 to PN160 | Weld Neck, Blind |
DIN | DN10 to DN3600 | PN6 to PN40 | Slip On, Weld Neck, Blind |
Difference Between Incoloy 825 RF, FF & RTJ Flange Face Types
Description | FF – Flat Face | RF – Raised Face | RTJ – Ring Type Joint |
Pressure Range | Low pressures | Broad | Used for higher pressures |
Gasket Type | Soft, non metallic | Non metallic, semi metallic | Hard, metal ring |
Sealing Face | ID to OD | ID to raised face OD | Groove in flange face |
Sealing Area | Large | Medium | Small |
Class | 125 lb, 250 lb | All classes | All, generally 900 lb and above |
Temperature Range | Low temperatures | Broad | Broad |
UNS N08825 Flanges ASTM & ASME Standard Classes
Standard | Diameter | Class | No. Bolts | Bolt Size | Bolt Circle | Bolt Hole Dia |
ANSI B16.5 | 89 | ANSI 150 | 4 | 13 | 60 | 16 |
ANSI B16.5 | 95 | ANSI 300 | 4 | 13 | 67 | 16 |
ANSI B16.5 | 95 | ANSI 600 | 4 | 13 | 67 | 16 |
ANSI B16.5 | 121 | ANSI 900 | 4 | 19 | 83 | 22 |
ANSI B16.5 | 121 | ANSI 1500 | 4 | 19 | 83 | 22 |
AS 2129 | 95 | Table C | 4 | 13 | 67 | 14 |
AS 2129 | 95 | Table D | 4 | 13 | 67 | 14 |
AS 2129 | 95 | Table E | 4 | 13 | 67 | 14 |
AS 2129 | 95 | Table F | 4 | 13 | 67 | 14 |
AS 2129 | 114 | Table H | 4 | 16 | 83 | 17 |
AS 2129 | 114 | Table J | 4 | 16 | 83 | 17 |
AS4087 | 95 | PN14 | 4 | M12 | 67 | 14 |
ISO 7005 (DIN) | 80 | PN6 | 4 | M10 | 55 | 11 |
ISO 7005 (DIN) | 95 | PN10 | 4 | M12 | 65 | 14 |
ISO 7005 (DIN) | 95 | PN16 | 4 | M12 | 65 | 14 |
ISO 7005 (DIN) | 90 | PN20 | 4 | M14 | 60.5 | 16 |
ISO 7005 (DIN) | 95 | PN25 | 4 | M12 | 65 | 14 |
ISO 7005 (DIN) | 95 | PN40 | 4 | M12 | 65 | 14 |
HS Code of WNR 2.4858 Incoloy 825 Flanges
Grade | HS Code |
Incoloy 825 Flanges | 73079190 (confirm correct code with your export documentation team – the Inconel 625 Flanges page on this site uses 75072000; both nickel alloy products should carry the same HS heading) |
Testing & Inspection of Alloy 825 Flanges
Test | Description |
Flaring Test | Assesses structural integrity under extreme stress via axial deformation at a designated angle |
Intergranular Corrosion Test | Confirms resistance to intergranular corrosion, particularly important given the titanium stabilisation feature of Alloy 825 |
Hardness Test | Measures material resistance to indentation as an indicator of strength and durability |
Positive Material Identification (PMI) | Uses XRF spectrometry to verify alloy composition against ASTM B564 |
Mechanical Testing | Tensile, impact, and fatigue tests to confirm strength properties meet applicable standards |
Dye Penetrant Testing | Non-destructive surface examination to identify cracks and defects |
Flattening Test | Confirms material retains integrity when rolled flat without cracking |
Eddy Current Testing | Non-destructive detection of surface and near-surface defects via induced electrical current |
DIN 2.4858 Incoloy 825 Flange Type Codes
Type Code | Flange Type / Description |
101 | Nickel Alloy 825 Plate flange for welding |
102 | Incoloy 825 Loose plate flange with weld on plate collar |
104 | Alloy 825 Loose plate flange with weld nut collar |
105 | Incoloy Alloy 825 Blank flange |
111 | Nickel Alloy 825 Weld neck flange |
112 | Incoloy 825 Hubbed slip on flange for welding |
113 | Alloy 825 Hubbed threaded flange |
121 | Incoloy Alloy 825 Integral flange |
Temperature & Pressure Rating of Incoloy 825 Flanges (Class 150, bar)
Temp (deg C) | Class 150 (bar) | Temp (deg F) | Class 150 (psi) |
100 | 17.7 | -20 to 100 | 290 |
150 | 15.8 | 200 | 260 |
200 | 13.8 | 300 | 230 |
250 | 12.1 | 400 | 200 |
300 | 10.2 | 500 | 170 |
325 | 9.3 | 600 | 140 |
350 | 8.4 | 650 | 125 |
375 | 7.4 | 700 | 110 |
400 | 6.5 | 750 | 95 |
425 | 5.5 | 800 | 80 |
450 | 4.6 | 850 | 65 |
475 | 3.7 | 900 | 50 |
500 | 2.8 | 950 | 35 |
538 | 1.4 | 1000 | 20 |
Pressure Ratings of Alloy 825 Flanges by Class (psi and MPa)
Class | 100 deg F (37.8 deg C) | 200 deg F (93.3 deg C) | 400 deg F (204.4 deg C) | 600 deg F (315.6 deg C) | 800 deg F (426.7 deg C) |
150 | 285 psi (2.0 MPa) | 270 psi (1.9 MPa) | 240 psi (1.7 MPa) | 210 psi (1.4 MPa) | 185 psi (1.3 MPa) |
300 | 740 psi (5.1 MPa) | 700 psi (4.8 MPa) | 620 psi (4.3 MPa) | 540 psi (3.7 MPa) | 480 psi (3.3 MPa) |
600 | 1480 psi (10.2 MPa) | 1370 psi (9.4 MPa) | 1240 psi (8.6 MPa) | 1080 psi (7.5 MPa) | 960 psi (6.6 MPa) |
900 | 2220 psi (15.3 MPa) | 2050 psi (14.1 MPa) | 1840 psi (12.7 MPa) | 1620 psi (11.1 MPa) | 1440 psi (9.9 MPa) |
Nickel 825 Flanges Welding Consumables & Procedures
Welding Electrode | Welding Electrode 112 |
Welding Electrode | Welding Electrode 686CPT |
Filler Metal | Filler Metal 625 |
Filler Metal | Filler Metal 686CP |
Common Applications of Incoloy 825 Flanges
Incoloy 825 flanges are engineered for severe corrosive environments where standard materials fail:
- Chemical Processing: Sulfuric acid production, phosphoric acid processing, pickling operations, and chloride containing solutions where resistance to pitting and stress corrosion cracking is critical.
- Oil and Gas: Sour gas piping systems, wellhead equipment, and offshore platforms where hydrogen sulfide and chloride exposure demand exceptional material performance.
- Marine and Seawater Systems: Desalination plants, seawater cooling systems, offshore installations, and marine heat exchangers requiring resistance to chloride induced corrosion.
- Power Generation: Nuclear fuel processing, flue gas desulfurization systems, and high temperature steam condensate lines.
- Pollution Control: Scrubber systems, acid gas cleaning equipment, and wastewater treatment facilities handling aggressive chemical environments.
Mechanical Properties of ASTM B564 Incoloy 825 Flanges
Grade | Tensile Strength | Yield Strength (0.2% Offset) | Elongation |
825 | 80,000 psi / 550 MPa (min) | 32,000 psi / 220 MPa (min) | 30% (min) |
These are ASTM B564 minimum requirements at room temperature in the annealed condition. Typical mill values are generally higher.
Physical Properties of Incoloy 825 Flanges
Property | Value | |
Density | 8.1 g/cm3 (8100 kg/m3) | |
Melting Point Range | 1370 to 1400 degrees C (2498 to 2552 degrees F) | |
Specific Heat | 0.44 J/g degrees C (0.105 Btu/lb degrees F) | |
Thermal Conductivity | 11.1 W/m K (6.42 Btu/ft hr degrees F) at 100 degrees C | |
Electrical Resistivity | 1.13 micro-ohm metres | |
Modulus of Elasticity | 196 GPa (28.4 x 10 to the 6 psi) | |
Poisson’s Ratio | 0.3 | |
Export Markets
Kalpataru Piping Solution exports Incoloy 825 flanges to clients across the Middle East, Europe, Southeast Asia, Africa, and the Americas, including key markets such as the United Arab Emirates, Saudi Arabia, Singapore, the United Kingdom, and the United States. For a shipment quote to your region, contact our export team.
Mechanical Properties of ASTM B564 Incoloy 825 Flanges
Use the table below to reference typical room-temperature mechanical properties for Alloy 825 flanges as supplied to ASTM B564.
Grade | Tensile Strength | Yield Strength (0.2% Offset) | Elongation |
825 | 80,000 psi / 550 MPa | 32,000 psi / 220 MPa | 30% |
Other Available Stock of ASTM B564 Incoloy 825 Flanges
- Incoloy 825 WNRF Flanges Dealer
- Alloy 825 Spectacle Blind Flanges Stockist
- Incoloy Alloy 825 Long Weld Neck Flanges
- ASME SB564 Incoloy 825 RTJ Flanges Supplier
- ANSI/ ASME B16.5 Incoloy 825 Blind Ring Flanges
- B564 Incoloy 825 BLRF Flanges Distributors
- Nickel Alloy 825 Lap Joint Flanges Trader
- SB564 Incoloy 825 LJRF Flanges Manufacturer
- Incoloy 825 Slip-on Raised Face Flanges
- Incoloy 825 SORF Flanges Stockholder
- B564 Incoloy Alloy 825 Screwed Flanges
- ANSI B16.5 Incoloy 825 SWRF Flanges
- Incoloy® Alloy 825 Reducing Flanges Stock
- Incoloy 825 Tongue & Groove Flanges
- Incoloy 825 EN 1092-1 Flanges in Mumbai
- Incoloy 825 ASME/ANSI B16.5 Flanges
- ASTM B564 Incoloy 825 Weldoflange
- Grade 825 Incoloy Raised Face Flanges
- SB564 Incoloy 825 Blind Raised Face Flange
- Incoloy® 825 Forged Flanges Wholesaler
- B16.5 Incoloy 825 Expander Flanges
- Incoloy 825 Ring Spacers (Paddle Spacers)
- Incoloy 825 Male & Female Flanges
- B564 Incoloy 825 Flat Face Flanges
- Incoloy 825 Flat Flanges Exporter
- Alloy UNS N08825 Flanges
- Incoloy DIN 2.4858 Flange
- Incoloy 825 High Hub Blind Flanges
- Incoloy 825 ASME B16.5 Loose Flanges
- Incoloy 825 BS 4504 Flanges
- Incoloy 825 DIN Flanges in India
- Nickel Alloy 825 Flanges in Supplier
FAQ’s About Incoloy 825 Flanges
INCOLOY 825 is a nickel iron chromium alloy (UNS N08825) with additions of molybdenum, copper, and titanium. It is designed for excellent resistance to both oxidising and reducing acids, making it widely used in chemical processing and marine applications.
Incoloy 825 (UNS N08825) has a lower nickel base (38 to 46 percent) with iron as the balance element, while Inconel 625 (UNS N06625) has a higher nickel base (58 percent minimum) and is strengthened by niobium and tantalum. Inconel 625 offers higher mechanical strength and better performance at elevated temperatures above 540 degrees C, while Incoloy 825 is cost-effective for acid service and seawater applications up to 540 degrees C where the extreme mechanical demands of 625 are not required.
INCOLOY 825 offers superior resistance to acidic and corrosive environments due to its added molybdenum and copper, while INCOLOY 800 is designed mainly for high temperature stability and oxidation resistance above 540 degrees C.
INCOLOY 825 can typically withstand temperatures up to 540 degrees C (1000 degrees F) while maintaining mechanical strength and corrosion resistance.
INCOLOY 825 is heat treated through stabilising annealing, where the alloy is heated and rapidly cooled to enhance corrosion resistance, stabilise its microstructure, and improve overall performance.
Standard supply includes EN 10204 3.1 Mill Test Certificates from a NABL approved laboratory. EN 10204 3.2 witnessed inspection is available on request via TUV, Bureau Veritas, Lloyds, SGS, or DNV.