Industries operating in high-pressure, high-temperature, and corrosive environments require flange materials that offer exceptional strength, durability, and long-term reliability. Inconel 718 Flanges are among the most trusted nickel-based alloy flanges for demanding industrial applications because they maintain excellent mechanical properties even under extreme operating conditions. Their outstanding resistance to oxidation, corrosion, and creep makes them a preferred choice in aerospace, power generation, oil and gas, petrochemical, offshore, marine, and chemical processing industries. Metcore Steel & Alloys supplies premium-quality Inconel 718 flanges manufactured to international standards, ensuring consistent performance, dimensional accuracy, and dependable service life for critical piping systems.
Product Overview
Inconel 718 is a precipitation-hardenable nickel-chromium alloy strengthened with niobium and molybdenum. The alloy is specifically designed to perform under severe pressure and elevated temperatures while maintaining excellent tensile strength and fatigue resistance. These flanges are commonly available in Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, Long Weld Neck, Orifice, Spectacle Blind, and Ring Type Joint designs to suit diverse industrial piping requirements.
The alloy offers remarkable resistance to stress corrosion cracking, pitting, crevice corrosion, oxidation, and chloride attack. Due to its excellent weldability and machinability compared to many other nickel alloys, Inconel 718 remains one of the most widely specified materials for critical industrial piping connections.
Material Composition
The superior performance of Inconel 718 comes from its carefully balanced chemical composition.
| Element | Percentage (%) |
|---|---|
| Nickel | 50–55 |
| Chromium | 17–21 |
| Iron | Balance |
| Niobium + Tantalum | 4.75–5.50 |
| Molybdenum | 2.80–3.30 |
| Titanium | 0.65–1.15 |
| Aluminum | 0.20–0.80 |
| Cobalt | Maximum 1.00 |
| Carbon | Maximum 0.08 |
| Manganese | Maximum 0.35 |
| Silicon | Maximum 0.35 |
This composition provides an excellent combination of corrosion resistance, oxidation resistance, high-temperature stability, and outstanding mechanical strength.
Mechanical Properties
The alloy delivers exceptional mechanical performance across a broad temperature range.
- Tensile Strength: Approximately 1240 MPa
- Yield Strength: Approximately 1035 MPa
- Elongation: Around 12%
- Hardness: Approximately 331 HB
- Density: 8.19 g/cm³
- Melting Range: 1260°C–1336°C
These properties enable Inconel 718 Flanges to withstand heavy mechanical loads while maintaining structural integrity during continuous operation.
Chemical Properties and Corrosion Resistance
One of the major advantages of Inconel 718 is its superior resistance to harsh chemical environments. The chromium-rich composition forms a stable oxide layer that protects the surface from oxidation and corrosion.
The alloy performs exceptionally well in:
- Acidic environments
- Marine atmospheres
- Offshore platforms
- Chloride-containing media
- High-temperature oxidation
- Sulfur-containing environments
- Chemical processing plants
Its resistance to pitting, crevice corrosion, stress corrosion cracking, and oxidation significantly increases equipment reliability and reduces maintenance costs.
International Standards and Specifications
Inconel 718 flanges are manufactured according to internationally recognized quality standards.
Common standards include:
- ASTM B564
- ASME SB564
- ANSI B16.5
- ANSI B16.47
- MSS SP-44
- DIN Standards
- EN Standards
- JIS Standards
- ISO Standards
Equivalent material designations include:
- UNS N07718
- W.Nr. 2.4668
- DIN 2.4668
- EN NiCr19Fe19Nb5Mo3
- ISO Nickel Alloy 718
These standards ensure compatibility with global industrial projects and international engineering specifications.
Available Types and Sizes
Inconel 718 flanges are manufactured in numerous configurations for different piping systems.
Available types include:
- Weld Neck Flanges
- Slip-On Flanges
- Blind Flanges
- Socket Weld Flanges
- Threaded Flanges
- Lap Joint Flanges
- Long Weld Neck Flanges
- Ring Type Joint Flanges
- Orifice Flanges
- Spectacle Blind Flanges
Typical size range extends from:
- ½" NB to 60" NB
- Pressure Ratings: Class 150 to Class 2500
- DIN PN6 to PN400
- ASME B16.5
- ASME B16.47 Series A & B
Custom dimensions are also available according to project requirements.
Manufacturing Process
Producing Inconel 718 flanges involves strict quality control throughout every manufacturing stage.
The manufacturing process generally includes raw material inspection, forging, heat treatment, machining, drilling, dimensional inspection, surface finishing, marking, testing, and protective packaging.
Advanced CNC machining ensures excellent dimensional accuracy while precision forging improves grain structure and enhances overall strength.
Testing and Quality Assurance
Every flange undergoes rigorous inspection before dispatch.
Quality testing includes:
- Positive Material Identification (PMI)
- Ultrasonic Testing
- Radiographic Testing
- Hydrostatic Testing
- Hardness Testing
- Mechanical Testing
- Chemical Analysis
- Visual Inspection
- Dimensional Inspection
- Dye Penetrant Testing
These inspections ensure compliance with international quality standards and customer specifications.
Features and Advantages
Inconel 718 flanges provide numerous operational benefits.
They offer exceptional strength at elevated temperatures while resisting oxidation and corrosion in aggressive industrial environments. Their excellent fatigue resistance makes them suitable for cyclic loading conditions, while their superior weldability simplifies installation and fabrication. High resistance to creep deformation allows reliable operation during prolonged exposure to elevated temperatures. Excellent dimensional stability further ensures leak-free piping connections over extended service periods.
These characteristics reduce maintenance requirements, improve operational safety, and extend equipment service life.
Industrial Applications of Inconel 718 Flanges
These flanges are widely used across industries where reliability is critical.
Major application areas include:
- Aerospace Engineering
- Oil & Gas Processing
- Offshore Drilling Platforms
- Petrochemical Plants
- Chemical Processing Industries
- LNG Facilities
- Marine Engineering
- Nuclear Power Plants
- Thermal Power Stations
- Heat Exchangers
- Pressure Vessels
- Refineries
- Fertilizer Plants
- Pharmaceutical Manufacturing
- Desalination Plants
Their ability to withstand severe operating conditions makes them an ideal choice for critical piping systems.
Pressure and Temperature Performance
Inconel 718 performs exceptionally well in high-pressure and elevated-temperature environments.
The alloy retains outstanding tensile strength and creep resistance at temperatures exceeding 650°C while maintaining excellent fatigue performance under cyclic loading conditions. Its resistance to thermal expansion and oxidation ensures stable operation in turbines, reactors, exhaust systems, and high-pressure process equipment.
Supply and Export Capabilities
Metcore Steel & Alloys supplies Inconel 718 flanges in various sizes, pressure ratings, and flange configurations to meet industrial project requirements. Products are available with complete material traceability, mill test certificates, and inspection documentation.
The company serves customers across sectors requiring dependable nickel alloy flanges for new installations, plant expansions, maintenance shutdowns, and replacement projects. Secure packaging and timely logistics help ensure safe delivery for domestic and international orders.
Why Industries Prefer Inconel 718 Flanges
Industrial engineers select Inconel 718 flanges because they combine exceptional mechanical strength with excellent corrosion resistance and long service life. Their ability to perform under extreme temperatures, high pressures, and aggressive chemical environments minimizes downtime and maintenance costs while improving operational efficiency. The alloy's proven reliability in demanding applications makes it one of the preferred materials for mission-critical piping systems where safety and durability cannot be compromised.
Why Choose Metcore Steel & Alloys
Metcore Steel & Alloys is committed to supplying premium-quality Inconel 718 flanges that meet stringent international standards for quality, precision, and performance. Every product undergoes comprehensive inspection to ensure dimensional accuracy, material integrity, and dependable service in critical industrial applications. With a focus on quality manufacturing, technical expertise, timely delivery, and customer satisfaction, the company provides reliable flange solutions for projects across multiple industrial sectors.
Contact Us
+91-9833872282
+91-9833872282
Ambika Sadan Sant Sena Maharaj Marg, Mumbai 400004