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Inconel 718/825 Flanges are precision-engineered components made from premium nickel-chromium alloy, specifically designed to withstand extreme temperatures and corrosive environments. These flanges offer outstanding mechanical strength and durability, making them ideal for critical industrial applications.
The primary composition of Inconel 718/825 includes nickel, chromium, and iron, which ensures excellent resistance against oxidation and corrosion. This makes the flanges highly suitable for chemical processing plants, power generation units, and marine applications where exposure to harsh environments is common.
Inconel 718/825 Flanges are available in a variety of types to suit diverse industrial requirements. Common types include Weld Neck Flanges, Slip-On Flanges, Blind Flanges, Threaded Flanges, and Socket Weld Flanges. Each type is engineered to meet specific pressure and temperature requirements.
Manufactured in compliance with global standards such as ASME, ASTM, DIN, and EN, Inconel 718/825 Flanges guarantee consistent quality, reliability, and safety. These standards ensure the flanges are suitable for high-pressure and high-temperature applications in demanding industrial environments.
One of the key advantages of Inconel 718/825 Flanges is their exceptional resistance to stress corrosion cracking. The alloy maintains structural integrity even under prolonged exposure to aggressive chemicals, steam, and high-temperature oxidizing environments.
Inconel 718/825 Flanges are widely used in industries such as oil and gas, petrochemical, aerospace, nuclear power, and marine engineering. Their ability to perform under extreme conditions makes them a preferred choice for pipelines, pressure vessels, heat exchangers, and reactors.
The mechanical properties of Inconel 718/825 Flanges include high tensile strength, good elongation, and excellent creep resistance. These properties ensure long-lasting performance, reduced maintenance, and minimal risk of failure, even in critical applications.
Flanges made from Inconel 718/825 are available in various sizes, pressure ratings, and face types. This flexibility allows engineers and designers to select the most suitable flange for their specific project requirements, ensuring optimal performance and safety.
Inconel 718/825 Flanges are not only functional but also cost-effective in the long term. Their durability and resistance to corrosion and high temperatures significantly reduce replacement frequency, downtime, and maintenance costs, offering excellent return on investment.
Specification Table
| Standard | Material Grade | Type | Size Range | Pressure Rating | End Connection | Finish |
|---|---|---|---|---|---|---|
| ASTM B564 / ASME SB564 | Inconel 718 | Weld Neck, Slip-On, Blind, Threaded, Socket Weld | 1/2" – 48" | Class 150 – 2500 | RF / RTJ | Polished / Machined |
| ASTM B564 / ASME SB564 | Inconel 825 | Weld Neck, Slip-On, Blind, Threaded, Socket Weld | 1/2" – 48" | Class 150 – 2500 | RF / RTJ | Polished / Machined |
Chemical Composition (Typical ranges for SSK400)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Inconel 718 (%) | Inconel 825 (%) |
|---|---|---|
| Nickel (Ni) | 50-55 | 38-46 |
| Chromium (Cr) | 17-21 | 19.5-23.5 |
| Iron (Fe) | Balance | 38 min |
| Cobalt (Co) | ≤1 | ≤2 |
| Molybdenum (Mo) | 2.8-3.3 | 2.5-3.5 |
| Copper (Cu) | ≤0.3 | 1.5-3.0 |
| Niobium + Tantalum (Nb+Ta) | 4.75-5.5 | 0.5-1.0 |
| Aluminium (Al) | 0.2-0.8 | 0.2-0.6 |
| Titanium (Ti) | 0.65-1.15 | 0.2-0.5 |
| Carbon (C) | 0.08 max | 0.10 max |
| Manganese (Mn) | 0.35 max | 1.0 max |
| Silicon (Si) | 0.35 max | 0.5 max |
| Phosphorus (P) | 0.015 max | 0.03 max |
| Sulfur (S) | 0.015 max | 0.03 max |
Mechanical Properties (Typical)
| Property | Inconel 718 | Inconel 825 |
|---|---|---|
| Density (g/cm³) | 8.19 | 8.43 |
| Ultimate Tensile Strength (MPa) | 1240-1380 | 690-825 |
| Yield Strength (MPa) | 1035-1100 | 275-380 |
| Elongation (%) | 12-20 | 30-40 |
| Hardness (HB) | ≤ 350 | ≤ 230 |
| Melting Point (°C) | 1260-1336 | 1425-1450 |
| Modulus of Elasticity (GPa) | 205-210 | 200 |
| Shear Strength (MPa) | 450-480 | 400-450 |
| Operating Temperature (°C) | Up to 700 | Up to 600 |
Equivalent Grades
| Material | ASTM / ASME | UNS | EN / DIN | JIS |
|---|---|---|---|---|
| Inconel 718 | ASTM B564, ASME SB564 | UNS N07718 | 2.4668 | – |
| Inconel 825 | ASTM B564, ASME SB564 | UNS N08825 | 2.4858 | – |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Nominal Size (inch) | Outside Diameter (OD) mm | Thickness (mm) | Bolt Circle Diameter (BCD) mm | Bolt Hole Diameter (mm) | No. of Bolts | Approx. Weight (kg) |
|---|---|---|---|---|---|---|
| 1/2" | 89 | 16 | 60 | 14 | 4 | 1.2 |
| 1" | 114 | 19 | 75 | 14 | 4 | 2.0 |
| 2" | 152 | 22 | 105 | 18 | 4 | 4.5 |
| 4" | 203 | 27 | 165 | 18 | 8 | 10.5 |
| 6" | 254 | 28 | 190 | 18 | 8 | 18.0 |
| 8" | 318 | 31 | 250 | 22 | 8 | 30.0 |
| 10" | 381 | 35 | 305 | 22 | 12 | 45.0 |
| 12" | 445 | 38 | 360 | 22 | 12 | 65.0 |
Common Types Of Flangess
Ring Flanges
Type of Flanges
General Flanges
Stainless 400 Pipe Flanges
ASME B16.5 Flanges
Stainless 400 Flanges
Frequently Asked Questions (FAQ)
What are Inconel 718 and 825 Flanges?
Inconel 718 and 825 flanges are nickel-based alloy flanges known for their excellent corrosion resistance, high strength, and ability to withstand extreme temperatures. They are commonly used in chemical, petrochemical, marine, and aerospace industries.
What types of Inconel 718/825 Flanges are available?
These flanges are available in several types including Weld Neck, Slip-On, Blind, Socket Weld, and Threaded flanges, suitable for various piping and pressure vessel applications.
What are the pressure ratings for Inconel 718/825 Flanges?
The pressure ratings typically range from Class 150 to Class 2500 as per ASME/ASTM standards, depending on flange size, type, and application requirements.
What is the chemical composition of Inconel 718 and 825?
Inconel 718 contains Nickel 50-55%, Chromium 17-21%, Iron Balance, Niobium + Tantalum 4.75-5.5%, and other alloying elements. Inconel 825 contains Nickel 38-46%, Chromium 19.5-23.5%, Iron 38% min, and other elements like Molybdenum, Copper, Titanium, and Aluminium for enhanced corrosion resistance.
What are the applications of Inconel 718/825 Flanges?
These flanges are used in high-temperature and corrosive environments such as chemical plants, offshore oil & gas platforms, marine equipment, power generation, and aerospace components.
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