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Nickel Alloy Flanges

Nickel alloy flanges often face issues like flange face degradation, thermal distortion, and galling during tightening in corrosive or high-temperature services. We address these with forged Inconel, Monel, and Hastelloy flanges that maintain mechanical integrity up to 1093°C.

Standard Specification

ASTM B564 (Forgings), ASME SB564, NACE MR0175

Pressure Rating

Class 150 to 2500 (PN10 to PN420)

Material

Inconel 625 (UNS N06625), Monel 400 (UNS N04400), Hastelloy C276 (UNS N10276)

Nominal Size

½” to 24″ (DN15 to DN600)

Flange Type

WN, SO, BL
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Product Description

Machined as per ASME B16.5 with a 20% wall thickness allowance, our flanges deliver reliable sealing under repeated high-pressure loads. Each unit undergoes solution annealing and RTJ surface finish controls to ensure dimensional stability.

Facing Type

RF, RTJ [Special high-finish RTJ for cryogenic]

Dimensions

ASME B16.5 + 20% thickness allowance [For corrosion/erosion]

Bolt Circle Diameter

Matches standard flanges [±0.02″ tolerance for RTJ]

Number & Size of Bolt Holes

Nickel alloy bolts (ASTM B574) [Anti-seize compound required]

Surface Finish

32-63 μin Ra (standard), 8-16 μin Ra (ultra-high purity) [EP/MP options]

Corrosion Resistance

C276: PREN ≥65, 625: PREN ≥45 [Tested per ASTM G28/G31]

Temperature Rating

269°C to +1093°C [Material dependent]

Material Certification

EN 10204 3.2, NORSOK M650, NACE MR0175

Gasket Compatibility

PTFE, Flexible Graphite [No asbestos/chloride contamination]

Coating/Plating

Passivation

Manufacturing Method

Forged + Solution Annealed [Inconel: 1093°C WQ, Hastelloy: 1121°C WQ]

Technical Advantages

We use forgings compliant with ASTM B564 and solution anneal them at calibrated temperatures (Inconel at 1093°C, Hastelloy at 1121°C) to avoid grain-boundary sensitization. The bolt circle diameter stays within ±0.02″, critical for RTJ alignment in high-integrity sealing joints. 
Each flanges comes with EN 10204 3.2 and NORSOK M650 certifications, ensuring traceability and acceptance in offshore and refinery projects. Ultra-low Ra finishes, optional EP/MP, and anti-seize guidance for B574 bolts make installation stable even in thermal stress zones.

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Industry Applications

Chemical Processing Units

C276 flanges resist aggressive chlorides and mineral acids, making them suitable for scrubbers, reactors, and acid transfer systems.

Marine and Offshore Equipment

Monel 400 components prevent stress corrosion cracking in seawater exposure, used in pump discharge and deck-level piping.

Heat Exchanger Systems

Inconel 625 maintains structural performance above 1000°C, ideal for flange connections in high-temperature tube sheets and headers.

Pharmaceutical Manufacturing

Flanges with 8–16 μin Ra finish support ultra-clean PTFE and graphite gaskets, ensuring no contamination in validated piping loops.

Desalination and Water Treatment

High PREN values (≥65 for C276) protect against crevice corrosion in brine lines, intake headers, and evaporator systems.

Pulp and Paper Plants

Nickel alloy flanges withstand mixed acid and alkaline processing, preventing failure in bleaching and liquor recovery piping.

nickel alloy flanges

From Process Safety to Lifecycle Stability

You can choose with confidence knowing our nickel alloy flanges meet both mechanical and corrosion benchmarks across a range of critical flow systems. The added wall thickness and serration profiles help maintain sealing force during expansion and contraction cycles. 
With a global sourcing setup, we ensure short lead times while maintaining batch-level traceability and material certification. This allows end-users to reduce unplanned maintenance while extending service life under some of the harshest process conditions. 

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Having Doubts? Our FAQ

Check all our Frequently Asked Question

How do you handle flange face damage during tightening in RTJ joints?

We maintain a face flatness tolerance of 0.001” and apply a special high-finish RTJ surface for cryogenic and corrosive duty. This prevents galling and ensures even gasket compression. Our finish passes surface roughness checks with calibrated Ra gauges before dispatch.

Do your flanges meet dual dimensional standards for international projects?

We machine all flanges as per ASME B16.5 but include PN equivalence markings where requested. This supports integration in both ANSI and DIN-based piping systems. Our bolt circles are also verified for both inch and metric fittings.

What’s the bolt hole accuracy and do you provide anti-seize guidance?

We maintain ±0.01” hole position tolerance and confirm with go/no-go gauges. Nickel alloy bolts come with anti-seize compound use instructions to prevent galling. This combination ensures proper tightening without seizing during installation.

Are your products validated for use in sour service and offshore compliance?

Yes, all Monel and Hastelloy variants meet NACE MR0175 and NORSOK M650 requirements. Each lot passes hardness, grain size, and corrosion tests before approval. This ensures readiness for sour gas, marine, and platform duties without extra qualification steps.

Can we request special heat treatment cycles for different alloy grades?

Yes, we support custom solution annealing temperatures based on project-specific corrosion resistance needs. For example, Inconel 625 is heat-treated at 1093°C and Hastelloy C276 at 1121°C before water quenching. Each cycle is controlled with digital furnace logs and thermocouple validation.

How quickly can Frigate deliver nickel alloy flanges for urgent shutdown requirements?
  • Stock-supported sizes (½”–12”) available for expedited dispatch within 2–3 weeks 
  • Larger or custom forgings delivered in 4–8 weeks depending on grade and class 
  • Priority production slots available for shutdown-critical orders 
  • Real-time order tracking and milestone updates provided 
  • Global logistics coordination for on-time site delivery 
Can Frigate support project-specific documentation and inspection requirements?
  • Full MRB (Material Record Book) including MTC, heat treatment charts, and test reports 
  • Compliance with EN 10204 3.2, NACE, and NORSOK requirements 
  • Third-party inspections via BV, DNV, TUV, SGS upon request 
  • Dimensional inspection reports + RTJ profile validation included 
  • Digital documentation for easy integration into EPC workflows 
Do you offer customization beyond standard ASME B16.5 flanges?
  • Non-standard thickness, bore sizes, and drilling patterns supported 
  • Custom RTJ groove profiles for critical sealing applications 
  • Capability to manufacture as per project drawings or hybrid ANSI/DIN specs 
  • Optional electropolishing (EP) / mechanical polishing (MP) for pharma-grade use 
  • Engineering support for design optimization and weight reduction
How does Frigate ensure consistency across bulk flange orders?
  • Forgings sourced from qualified mills with batch traceability 
  • Controlled machining with tight tolerances (±0.02” BCD, ±0.01” hole position) 
  • Each batch validated through mechanical, corrosion, and PMI testing 
  • Standardized process control plans (PCP) and inspection checkpoints 
  • Repeat-order consistency backed by documented manufacturing history  
What support does Frigate provide during installation and commissioning?
  • Detailed installation guidelines including bolt torque and anti-seize usage 
  • Recommendations for gasket selection based on service conditions 
  • On-request technical consultation for field engineers and contractors 
  • Troubleshooting support for alignment, sealing, or galling issues 
  • Post-installation follow-up to ensure long-term sealing performance 
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LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Operations Office

9/1, Poonthottam Nagar, Ramanandha Nagar, Saravanampatti, Coimbatore-641035, Tamil Nadu, India. ㅤ

Other Locations

  • Bhilai
  • Chennai
  • India
  • Germany
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LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Other Locations

  • Bangalore
  • Chennai
  • India
  • Germany
Become a Frigatian
Become a Supplier

GENERAL ENQUIRIES

  • +91 96778 64606
  • manufacture@frigate.ai
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Nickel Alloy Flanges

Need reliable wires and cables for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

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Nickel Alloy Flanges

Need reliable Machining for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

Get Latest Price

Get Price Form