Inconel 800 / 825 Flanges

What are Inconel 800 / 825 Flanges?

Inconel 800 and 825 flanges are high-performance piping components used to:

• Connect piping systems: Provide secure and leak-proof joints
• Withstand high temperatures: Suitable for thermal processing applications
• Resist corrosion: Ideal for aggressive chemical environments
• Ensure durability: Maintain performance under stress and harsh conditions

These flanges are made from nickel-iron-chromium alloys, offering a balance of strength, corrosion resistance, and thermal stability.

Composition Highlights (Typical)

Inconel 800:

• Nickel (Ni): 30 – 35% → Provides corrosion resistance
• Chromium (Cr): 19 – 23% → Enhances oxidation resistance
• Iron (Fe): Balance
• Carbon (C): ≤ 0.10%

Inconel 825:

• Nickel (Ni): 38 – 46% → Excellent corrosion resistance
• Chromium (Cr): 19.5 – 23.5% → Oxidation resistance
• Molybdenum (Mo): 2.5 – 3.5% → Improves pitting resistance
• Copper (Cu): 1.5 – 3% → Enhances resistance to sulfuric acid
• Iron (Fe): Balance
• Carbon (C): ≤ 0.05%

Key Advantage: Inconel 825 offers superior corrosion resistance compared to 800 due to added molybdenum and copper.

Key Features of Inconel 800 / 825 Flanges

• Excellent corrosion resistance: Suitable for chemical and acidic environments
• Good high-temperature strength: Performs well under heat exposure
• Outstanding resistance to oxidation and scaling
• Resistance to pitting and crevice corrosion (825)
• Good mechanical strength and durability
• Excellent weldability and fabrication properties
• Long service life in aggressive conditions

Mechanical Properties

Inconel 800:

• Tensile Strength: ~600 MPa → Strong under load
• Yield Strength: ≥ 240 MPa → Resists deformation
• Elongation: ≥ 30% → Good ductility

Inconel 825:

• Tensile Strength: ~585 MPa
• Yield Strength: ≥ 220 MPa
• Elongation: ≥ 30%

These properties ensure reliable performance in industrial applications.

Physical Properties

• Density: ~8.0 g/cm³ → Strong and durable
• Melting Range: 1350 – 1400°C → Suitable for elevated temperatures
• Modulus of Elasticity: ~200 GPa → High stiffness
• Thermal Conductivity: ~11 – 14 W/m•K → Moderate heat transfer
• Coefficient of Expansion: ~14 µm/m°C → Stable under thermal stress

Corrosion & Heat Resistance

Inconel 800 / 825 flanges offer excellent resistance to:

• Oxidation and scaling at high temperatures
• Acidic environments (especially sulfuric and phosphoric acids – 825)
• Pitting and crevice corrosion (825)
• Chloride stress corrosion cracking
• Industrial chemical environments

Heat Treatment

• Annealing: 980 – 1150°C
• Rapid cooling (air or water quenching)

This enhances ductility and maintains corrosion resistance.

Weldability

Inconel 800 / 825 flanges can be welded using:

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

Recommendations:

• Use matching filler materials
• Maintain clean welding conditions
• Control heat input

Machinability

• Moderate machinability
• Use carbide cutting tools
• Maintain low cutting speeds
• Apply adequate coolant to reduce heat

Standards & Specifications

• ASTM B564
• ASME SB564
• ANSI B16.5
• ANSI B16.47
• ASTM B409 / B424

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 800 / 825 Flanges

• Chemical Processing Industry: Used in acid handling and chemical equipment.
• Oil & Gas Industry: Suitable for corrosive and high-temperature environments.
• Power Generation: Used in heat exchangers and boilers.
• Marine Industry: Handles seawater and harsh environments (especially 825).
• Pollution Control Systems: Used in scrubbers and flue gas systems.

Quality Testing & Inspection

All flanges undergo strict quality checks:

• Chemical composition testing → Ensures correct alloy
• Mechanical testing → Verifies strength
• Dimensional inspection → Confirms accuracy
• Surface examination → 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 800 / 825 Flanges are an excellent choice for industries requiring strong corrosion resistance, thermal stability, and durability in harsh environments. While Inconel 800 is ideal for high-temperature applications, Inconel 825 provides enhanced resistance to aggressive chemical environments.

Virami Steel Hub offers high-quality Inconel 800 / 825 flanges that meet global standards, ensuring long-term reliability, performance, and safety.