Alloy 800H Flanges Manufacturer in India
Alloy 800H is a high-carbon variant of the nickel-iron-chromium alloy family, specially engineered to deliver superior strength, creep resistance, and structural stability in continuous high-temperature environments. It offers excellent resistance to oxidation, carburization, and thermal fatigue, making it highly reliable for extreme industrial conditions. Alloy 800H Flanges are widely used in piping systems that demand high thermal stability, mechanical strength, and long service life. These flanges perform efficiently in high-pressure and high-temperature operations, ensuring strong structural integrity and leak-free connections in chemical processing plants, petrochemical industries, refineries, power generation units, nuclear facilities, heat exchangers, furnaces, thermal processing systems, and high-temperature process piping applications.
What Are Alloy 800H Flanges?
Alloy 800H flanges are manufactured in accordance with ASTM B564 / UNS N08810 standards using forged and rolled nickel alloy for high-performance piping systems. This grade features controlled higher carbon content, which significantly improves creep strength and rupture resistance at elevated temperatures. The balanced composition of nickel, chromium, and iron provides excellent resistance to oxidation, carburization, and stress corrosion cracking. Alloy 800H flanges are specifically designed for systems exposed to continuous heat, high pressure, and aggressive industrial media. They are widely used in heat exchangers, nuclear steam generator tubing systems, process piping, heating element casings, carburizing equipment, chemical plants, refineries, power plants, furnaces, and thermal processing industries where thermal stability, mechanical reliability, and long operational life are essential.
Table of Contents
- Specification of Alloy 800H Flanges
- Chemical Composition of Alloy 800H Flanges
- Mechanical Properties of Alloy 800H Flanges
- Equivalent Grades of Alloy 800H Flanges
- Alloy 800H Flanges Weight Chart
- Dimension of Incoloy 800H Flanges
- Pressure Rating of the Alloy 800H Flanges
- Types of Alloy 800H Flanges
- Applications and Industrial Uses of Alloy 800H Flanges
- Frequently Asked Questions (FAQ)
Specification of Alloy 800H Flanges
| Category | Details & Standards |
| Material Specifications | ASTM B446, B564 / ASME SB446, SB564 |
| Dimensional Standards | ANSI/ASME B16.5, B16.47 (Series A & B), B16.48, MSS SP44, BS4504, BS10, DIN, EN-1092 |
| Size Range | 1/2" (15 NB) to 48" (1200 NB) |
| Pressure Ratings | Class 150, 300, 600, 900, 1500, 2500 PN6, PN10, PN16, PN25, PN40, PN64 |
| Standard Forms | SORF, WNRF, Blind, Threaded, Socket Weld, Lap Joint, RTJ, Long Weld Neck |
| Specialty Forms | Spectacle Blind, Spacer Ring, Nipo Flange, Nipolet, Orifice Flanges, Plate Flanges |
| Flange Face Type | Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ) |
| Physical Geometry | Round, Square, Hex (A/F), Rectangle, Billet, Ingot, Forging |
Chemical Composition of Alloy 800H Flanges
The chemical composition of Alloy 800H Flanges is just a little bit different from others, and its detailed information is given below.
| Grade | C | Mn | Si | S | Cu | Fe | Ni | Cr | Al | Ti |
| 800H | 0.05 - 0.10 | 1.50 max | 1.00 max | 0.015 max | 0.75 max | 39.50 min | 30.0 - 35.0 | 19.0 - 23.0 | 0.15 - 0.60 | 0.15 - 0.60 |
Mechanical Properties of Alloy 800H Flanges
The tensile strength, ductability and other mechanical properties of this material is listed below.
| Grade | Density | Melting Point | Tensile Strength | Yield Strength (0.2% Offset) | Elongation |
| Alloy 800H | 7.94 g/cm- | 1385 -C (2525 -F) | 520 MPa (75,000 psi) | 205 MPa (30,000 psi) | 30% |
Equivalent Grades of Alloy 800H Flanges
This material is manufactured by many companies in different grades and some of the equivalent grades are provided in the following table.
| Standard | Werkstoff Nr. | UNS | JIS | BS | GOST | AFNOR | EN | OR |
| Incoloy 800H | 1.4958 / 1.4876 | N08810 | NCF 800H | NA 15(H) | ??670 | Z8NC33-21 | X5NiCrAlTi31-20 | XH32T |
Alloy 800H Flanges Weight Chart
The different weights of this material, which is important for you to know before buying this material is given below.
| Standard / Class | Diameter (mm) | Bolt Circle (PCD) | No. of Bolts | Bolt Size | Hole Dia (mm) |
|---|---|---|---|---|---|
| AS4087 PN14 | 95 | 67 | 4 | M12 | 14 |
| AS 2129 Table C | 95 | 67 | 4 | 13 | 14 |
| AS 2129 Table D | 95 | 67 | 4 | 13 | 14 |
| AS 2129 Table E | 95 | 67 | 4 | 13 | 14 |
| AS 2129 Table F | 95 | 67 | 4 | 13 | 14 |
| AS 2129 Table H | 114 | 83 | 4 | 16 | 17 |
| AS 2129 Table J | 114 | 83 | 4 | 16 | 17 |
| ANSI 150 | 89 | 60 | 4 | 13 | 16 |
| ANSI 300 | 95 | 67 | 4 | 13 | 16 |
| ANSI 600 | 95 | 67 | 4 | 13 | 16 |
| ANSI 900 | 121 | 83 | 4 | 19 | 22 |
| ANSI 1500 | 121 | 83 | 4 | 19 | 22 |
| ISO 7005 PN6 | 80 | 55 | 4 | M10 | 11 |
| ISO 7005 PN10 | 95 | 65 | 4 | M12 | 14 |
| ISO 7005 PN16 | 95 | 65 | 4 | M12 | 14 |
| ISO 7005 PN20 | 90 | 60.5 | 4 | M14 | 16 |
| ISO 7005 PN25 | 95 | 65 | 4 | M12 | 14 |
| ISO 7005 PN40 | 95 | 65 | 4 | M12 | 14 |
Dimension of Incoloy 800H Flanges
The dimension chart helps you to choose the most suitable flanges according to your requirements.
| NPS | OD | Min. (T) | RF (R) | Holes | Hole Dia | BC | SO Bore (SB) | WN Bore (WB) | Hub Base (HB) | SO LTH (SL) | WN LTH (WL) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 3.50 | 0.38 | 1.38 | 4 | 0.62 | 2.38 | 0.88 | 0.62 | 1.19 | 0.56 | 1.81 |
| 3/4 | 3.88 | 0.44 | 1.69 | 4 | 0.62 | 2.75 | 1.09 | 0.82 | 1.50 | 0.56 | 2.00 |
| 1 | 4.25 | 0.50 | 2.00 | 4 | 0.62 | 3.12 | 1.36 | 1.05 | 1.94 | 0.62 | 2.12 |
| 1-1/4 | 4.62 | 0.56 | 2.50 | 4 | 0.62 | 3.50 | 1.70 | 1.38 | 2.31 | 0.75 | 2.19 |
| 1-1/2 | 5.00 | 0.62 | 2.88 | 4 | 0.62 | 3.88 | 1.95 | 1.61 | 2.56 | 0.81 | 2.38 |
| 2 | 6.00 | 0.69 | 3.62 | 4 | 0.75 | 4.75 | 2.44 | 2.07 | 3.06 | 0.94 | 2.44 |
| 2-1/2 | 7.00 | 0.81 | 4.12 | 4 | 0.75 | 5.50 | 2.94 | 2.47 | 3.56 | 1.06 | 2.69 |
| 3 | 7.50 | 0.88 | 5.00 | 4 | 0.75 | 6.00 | 3.57 | 3.07 | 4.25 | 1.12 | 2.69 |
| 4 | 9.00 | 0.88 | 6.19 | 8 | 0.75 | 7.50 | 4.57 | 4.03 | 5.31 | 1.25 | 2.94 |
| 6 | 11.00 | 0.94 | 8.50 | 8 | 0.88 | 9.50 | 6.72 | 6.07 | 7.56 | 1.50 | 3.44 |
| 8 | 13.50 | 1.06 | 10.62 | 8 | 0.88 | 11.75 | 8.72 | 7.98 | 9.69 | 1.69 | 3.94 |
| 10 | 16.00 | 1.12 | 12.75 | 12 | 1.00 | 14.25 | 10.88 | 10.02 | 12.00 | 1.88 | 3.94 |
| 12 | 19.00 | 1.19 | 15.00 | 12 | 1.00 | 17.00 | 12.88 | 12.00 | 14.38 | 2.12 | 4.44 |
| 16 | 23.50 | 1.38 | 18.50 | 16 | 1.12 | 21.25 | 16.16 | 15.25 | 18.00 | 2.44 | 4.94 |
| 20 | 27.50 | 1.62 | 23.00 | 20 | 1.25 | 25.00 | 20.20 | 19.25 | 22.00 | 2.81 | 5.62 |
| 24 | 32.00 | 1.81 | 27.25 | 20 | 1.38 | 29.50 | 24.25 | 23.25 | 26.12 | 3.19 | 5.94 |
Pressure Rating of the Alloy 800H Flanges
The table provide the in detailed information on the pressure rating of nickel alloy 800H Flanges.
| Temp. ? | Class 75 | Class 150 | Class 300 | Class 400 | Class 600 | Class 900 |
|---|---|---|---|---|---|---|
| -29 to 38 | 10.0 | 20.0 | 51.7 | 68.9 | 103.4 | 155.1 |
| 50 | 9.8 | 19.5 | 51.7 | 68.9 | 103.4 | 155.1 |
| 100 | 8.8 | 17.7 | 50.7 | 67.5 | 101.3 | 152.0 |
| 150 | 7.9 | 15.8 | 45.9 | 61.2 | 91.9 | 137.8 |
| 200 | 6.9 | 13.8 | 42.7 | 56.9 | 85.3 | 128.0 |
| 250 | 6.0 | 12.1 | 40.5 | 53.9 | 80.9 | 121.4 |
| 300 | 5.1 | 10.2 | 38.9 | 51.8 | 77.7 | 116.6 |
Types of Alloy 800H Flanges
Alloy 800H Orifice Flange
Alloy 800H Threaded Flange
Alloy 800H Reducing Flange
Alloy 800H Lap Joint Flange
Alloy 800H Long Weld Neck Flange
Alloy 800H Socket Weld Flange
Alloy 800H Weld Neck Flange
Alloy 800H Blind Flange
Alloy 800H Slip-On Flange
Applications and Industrial Uses of Alloy 800H Flanges
Alloy 800H flanges are not just a single-use component, but part of a high-performance alloy family designed for extreme industrial environments. From large power plants, refineries, and petrochemical complexes to advanced chemical processing units and fertilizer plants, Alloy 800H flanges play a vital role in modern infrastructure. Their ability to withstand very high temperatures, pressure, and corrosive conditions makes them essential in critical piping systems. These flanges are widely used in nuclear power stations, heat treatment plants, thermal processing units, furnaces, boilers, heat exchangers, oil & gas facilities, hydrogen plants, waste-to-energy plants, cement plants, and metallurgical industries. Known for their strength, thermal stability, and long service life, Alloy 800H flanges support industries that demand safety, reliability, and continuous performance, while also offering durability, low maintenance, and long operational cycles in demanding industrial applications.
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Frequently Asked Questions (FAQ)
Alloy 800H flanges are pipe connectors made from a high-strength nickel-iron-chromium alloy, designed for use in high-temperature and demanding industrial systems.
Yes, Alloy 800H is specially made to perform well in extreme heat and maintains strength and stability at very high temperatures.
They are used in power plants, chemical plants, refineries, heat exchangers, furnaces, nuclear facilities, and high-temperature processing industries.
Yes, they are commonly used in nuclear systems because of their heat resistance, strength, and long-term reliability.
Yes, Alloy 800H flanges can be manufactured in custom sizes, pressure ratings, and specifications based on project needs.
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