Inconel 925 Flanges

What are Inconel 925 Flanges?

Inconel 925 flanges are high-performance piping components used to:

• Connect piping systems: Provide strong and leak-proof joints between pipes and equipment
• Handle high-pressure conditions: Suitable for demanding oil & gas applications
• Resist corrosion: Ideal for sour gas and aggressive chemical environments
• Ensure structural integrity: Maintain performance under extreme stress

These flanges are made from a precipitation-hardenable nickel-iron-chromium alloy with added molybdenum and copper, offering enhanced strength and corrosion resistance.

Composition Highlights (Typical)

Inconel 925:

• Nickel (Ni): 42 – 46% → Provides corrosion resistance
• Chromium (Cr): 19.5 – 23.5% → Enhances oxidation resistance
• Molybdenum (Mo): 2.5 – 3.5% → Improves resistance to pitting
• Copper (Cu): 1.5 – 3% → Enhances resistance to acidic environments
• Iron (Fe): Balance
• Titanium (Ti): 1.9 – 2.4% → Strengthening element
• Aluminum (Al): 0.1 – 0.5% → Improves oxidation resistance
• Carbon (C): ≤ 0.03%

Key Advantage: Combination of precipitation hardening and alloying elements provides high strength and excellent resistance to sulfide stress cracking.

Key Features of Inconel 925 Flanges

• High strength Suitable for high-pressure applications
• Excellent corrosion resistance Performs well in harsh environments
• Superior resistance to sulfide stress cracking (SSC)
• Good resistance to pitting and crevice corrosion
• Outstanding performance in sour gas environments
• Excellent fatigue resistance
• Long service life with minimal maintenance

Mechanical Properties

• Tensile Strength: ~760 – 1000 MPa → High load-bearing capability
• Yield Strength: ≥ 550 MPa → Excellent resistance to deformation
• Elongation: ≥ 20% → Good ductility

These properties make Inconel 925 ideal for high-stress industrial applications.

Physical Properties

• Density: ~8.14 g/cm³ → Strong and durable
• Melting Range: 1310 – 1365°C → Suitable for high-temperature use
• Modulus of Elasticity: ~200 GPa → High stiffness
• Thermal Conductivity: ~11 W/m•K → Moderate heat transfer
• Coefficient of Expansion: ~13 µm/m°C → Stable under thermal conditions

Corrosion & Heat Resistance

Inconel 925 flanges offer excellent resistance to:

• Sour gas environments (H₂S)
• Sulfide stress cracking (SSC)
• Pitting and crevice corrosion
• Acidic environments
• Oxidizing and reducing conditions

This makes them ideal for oil & gas and chemical processing industries.

Heat Treatment

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

This process provides excellent mechanical and corrosion-resistant properties.

Weldability

Inconel 925 flanges can be welded using:

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

Recommendations:

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

Machinability

• Moderate to difficult machinability due to high strength
• Use carbide tools
• Maintain low cutting speeds
• Apply sufficient coolant

Standards & Specifications

• ASTM B564
• ASME SB564
• ANSI B16.5
• ANSI B16.47
• ASTM B805

These standards ensure global quality compliance.

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 925 Flanges

• Oil & Gas Industry: Used in sour gas wells, pipelines, and offshore platforms.
• Chemical Processing: Handles corrosive chemicals and acids.
• Marine Industry: Suitable for harsh marine environments.
• Power Generation: Used in high-pressure systems.
• Petrochemical Industry: Applied in aggressive processing conditions.

Quality Testing & Inspection

All flanges undergo strict quality checks:

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

Mill Test Certificates (MTC) and third-party inspection reports 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 925 Flanges are a high-performance solution for industries requiring exceptional strength and resistance to sour gas and corrosive environments. Their superior mechanical properties and resistance to sulfide stress cracking make them ideal for oil & gas, petrochemical, and marine applications.

Virami Steel Hub delivers high-quality Inconel 925 flanges that meet global standards, ensuring durability, safety, and long-term performance.