Inconel 718 Flanges

What are Inconel 718 Flanges?

Inconel 718 flanges are high-performance piping components used to:

• Connect piping systems:Provide strong, leak-proof joints between pipes and equipment
• Withstand extreme conditions: Ideal for high-pressure and high-temperature applications
• Resist oxidation and corrosion: Suitable for harsh chemical and thermal environments
• Ensure structural reliability: Maintain integrity under heavy loads and stress

These flanges are made from a nickel-chromium alloy strengthened by precipitation hardening, offering exceptional strength and resistance to creep and fatigue.

Composition Highlights (Typical)

Inconel 718:

• Nickel (Ni):50 – 55% → Provides corrosion resistance and toughness
• Chromium (Cr): 17 – 21% → Enhances oxidation resistance
• Niobium (Nb): 4.75 – 5.5% → Strengthening element
• Molybdenum (Mo): 2.8 – 3.3% → Improves corrosion resistance
• Iron (Fe): Balance
• Titanium (Ti): 0.65 – 1.15% → Strength enhancement
• Aluminum (Al): 0.2 – 0.8% → Improves oxidation resistance
• Carbon (C): ≤ 0.08%

Key Advantage: Combination of niobium, titanium, and aluminum provides excellent precipitation hardening and high strength at elevated temperatures.

Key Features of Inconel 718 Flanges

• Exceptional high strength Maintains strength even at elevated temperatures
• Outstanding creep and rupture resistance
• Excellent fatigue resistance Suitable for cyclic loading applications
• Superior corrosion and oxidation resistance
• High resistance to stress corrosion cracking
• Good weldability compared to other superalloys
• Long service life in extreme conditions

Mechanical Properties

• Tensile Strength: ~965 – 1200 MPa → Extremely high load-bearing capacity
• Yield Strength: ≥ 550 MPa → Excellent resistance to deformation
• Elongation: ≥ 12 – 20% → Good ductility

These properties make Inconel 718 ideal for critical and high-stress applications.

Physical Properties

• Density: ~8.19 g/cm³ → Strong yet relatively lightweight
• Melting Range: 1260 – 1336°C → Suitable for high-temperature environments
• Modulus of Elasticity: ~205 GPa → High stiffness
• Thermal Conductivity: ~11.4 W/m•K → Low heat transfer
• Coefficient of Expansion: ~13 µm/m°C → Stable under thermal stress

Corrosion & Heat Resistance

Inconel 718 flanges offer excellent resistance to:

• High-temperature oxidation
• Creep and stress rupture
• Thermal fatigue and cyclic loading
• Chemical corrosion in aggressive environments
• Oxidizing and reducing conditions

Heat Treatment

• Solution Annealing: 925 – 980°C
• Aging (precipitation hardening): Enhances strength and hardness

This treatment provides exceptional mechanical performance.

Weldability

Inconel 718 flanges can be welded using:

• TIG (GTAW) → High precision welding
• MIG (GMAW) → Efficient fabrication
• SMAW → Suitable for industrial use

Recommendations:

• Use matching filler materials
• Control heat input
• Post-weld heat treatment may be required

Machinability

• Difficult machinability due to high strength
• Use carbide or ceramic tools
• Maintain low cutting speeds
• Apply sufficient coolant to reduce heat

Standards & Specifications

• ASTM B564
• ASME SB564
• ANSI B16.5
• ANSI B16.47
• ASTM B637

These standards ensure international quality and reliability.

Available Types of Inconel Flanges

• Weld Neck Flanges → High-pressure systems
• Slip-On Flanges → Easy installation
• Blind Flanges → Pipe closure
• Socket Weld Flanges → Small pipelines
• Threaded Flanges → Non-weld systems
• Lap Joint Flanges → Easy maintenance
• Orifice Flanges → Flow measurement

Sizes & Specifications

• Size Range: ½ inch to 48 inches
• Pressure Class: 150#, 300#, 600#, 900#, 1500#, 2500#
• Type: Forged

Surface Finish:

• Pickled → Clean surface
• Polished → Smooth finish
• Machined → Precision engineered

(Custom sizes available as per requirement)

Applications of Inconel 718 Flanges

• Aerospace Industry: Used in jet engines, turbines, and high-performance components.
• Power Generation: Applied in nuclear reactors and thermal systems.
• Oil & Gas Industry: Used in high-pressure and high-temperature applications.
• Chemical Processing: Handles aggressive chemicals and environments.
• Marine Industry: Suitable for corrosive marine conditions.

Quality Testing & Inspection

All flanges undergo strict quality checks:

• Chemical composition testing → Ensures correct alloy
• Mechanical testing → Verifies strength and durability
• Dimensional inspection → Confirms accuracy
• Surface testing → Detects defects
• PMI testing → Confirms material identity

Mill Test Certificates (MTC) and third-party inspections are provided.

Packaging & Delivery

• Export-quality wooden packaging
• Protective wrapping
• Proper labeling and traceability
• Safe and timely global shipping

Why Choose Virami Steel Hub?

• Trusted Inconel flange manufacturer in Mumbai
• Large stock availability
• Competitive pricing
• Custom manufacturing solutions
• Compliance with international standards
• Strong export network
• Dedicated customer support

Conclusion

Inconel 718 Flanges are a premium solution for applications requiring exceptional strength, creep resistance, and durability at high temperatures. Their outstanding mechanical properties and corrosion resistance make them ideal for aerospace, power generation, oil & gas, and chemical processing industries.

Virami Steel Hub delivers high-quality Inconel 718 flanges that meet global standards, ensuring long-term performance, safety, and reliability.