Inconel Flanges

Inconel flanges, also called nickel alloy flanges or high-temperature flanges, are pipe connection components manufactured from the Inconel superalloy family. The alloy is a nickel-chromium base, with nickel at 58–72%, chromium at 14–22%, and additions of molybdenum, iron, and niobium that vary by grade. Inconel 625 have a tensile strength of 930 MPa, a yield strength of 517 MPa, and a melting point of 1350°C, properties that hold under sustained thermal cycling. These flanges resist oxidation, pitting, and stress-corrosion cracking, which is why engineers specify them for chemical processing, marine, aerospace, oil and gas, and nuclear power applications.

Inconel Flanges Prices

Inconel flange prices are not fixed; they shift based on grade, geometry, and procurement volume. Two factors matter most: what the alloy costs on that day, and what your dimensional and testing requirements are.

• Approximate Price Range: 

The standard Inconel flanges are priced between Rs 3,750 and Rs 6,250 per piece. That range covers common sizes in Inconel 600 and Inconel 625. Grades like Inconel 718 or Inconel 725, and sizes above 24" NB, will sit above that bracket.

• Factors Affecting Price: 

The 6 factors that directly affect the final price: alloy grade, flange size, pressure class, wall thickness, order quantity, and required third-party testing. PMI, radiography, and NACE certification each add cost. Forged flanges cost more than cast, and tight-tolerance bore machining adds to lead time and price. Locking in a forward purchase agreement with your Inconel flanges supplier is the most reliable way to control procurement cost on long projects.

Inconel Flanges Grades

Inconel flanges are available in 7 standard grades. Each grade is built for a different combination of temperature, corrosion environment, and strength requirement. Specifying the right grade at the design stage helps avoid costly fabrication changes later.

• Inconel 725 Flanges
• Inconel 690 Flanges
• Inconel 718 Flanges
• Inconel 601 Flanges
• Inconel 617 Flanges
• Inconel 625 Flanges
• Inconel 600 Flanges

Types of Inconel Flanges

Inconel flanges are produced in 8 connection types. The right type depends on your pipe schedule, pressure class, and whether the line needs to be broken for maintenance.

• Weld Neck Flanges
• Slip-On Flanges
• Blind Flanges
• Socket Weld Flanges
•  Threaded Flanges
• Lap Joint Flanges
• Orifice Flanges
• Ring Type Joint (RTJ) Flanges

Inconel Flanges Specifications

The table below covers material grades, dimensional standards, pressure classes, and mechanical values. Use this as a quick reference before raising an inquiry or purchase order.

Inconel Flanges Size Chart

Inconel flanges are stocked and manufactured from 1/8" NB up to 48" NB. The chart below maps each NPS designation to its corresponding DN equivalent and standard size range.

Schedule Chart Of Inconel Flanges

The allowable working pressure drops as the operating temperature rises. Use this pressure-temperature rating table, which covers Classes 150 through 2500, to confirm your flange options before finalising the design.

Key Features Of Inconel Flanges

Inconel flanges are preferred over carbon steel and stainless steel in demanding service conditions where standard alloys may fail. The following 8 properties highlight their key advantages and performance capabilities.

• Corrosion resistance
• High-temperature strength
• Oxidation resistance
• Thermal stability
•  Durability
• Fatigue resistance
• Weldability
• Resistance to stress-corrosion cracking (SCC)

Applications of Inconel Flanges

Inconel flanges are used in high-heat, aggressive media, or corrosive seawater. Below are the 7 industries with the highest demand.

• Aerospace
• Chemical processing
• Marine engineering
• Oil and gas industry
• Power generation
• Heat treating equipment
• Food and pharmaceutical processing

How to Choose the Right Inconel Flanges Supplier and Manufacturer?

The quality of an Inconel flange is only as good as the manufacturer behind it. Mill test reports, dimensional accuracy, and on-time delivery all come down to who you buy from.

Selecting The Right Supplier And Manufacturer

Work with an Inconel flanges manufacturer that forges in-house. Third-party sourcing introduces traceability gaps. Confirm that the manufacturer holds ISO 9001 and can supply Mill Test Reports (MTRs) with heat and lot numbers traceable to the original melt.

Technical Considerations

Verify that material supply conforms to ASTM B564 / ASME SB564. For dimensional compliance, check ASME B16.5 for sizes up to 24" and ASME B16.47 for larger flanges. Ask specifically whether Positive Material Identification (PMI) testing is performed on every heat, not just on request.

Evaluating Supplier Credibility

Ask for a reference list of past orders in your industry, like oil and gas, marine, or nuclear procurement standards, which are non-negotiable benchmarks. Check export experience. An Inconel flanges supplier with a track record of international shipments maintains tighter documentation and packing standards than one serving only the domestic market.

Procurement Strategy

For project-based procurement, negotiate a blanket purchase order with fixed pricing tied to a base date LME nickel rate. For spot buys, confirm available stock and lead time before committing. Always factor in third-party inspection costs, export packaging, and freight when comparing Inconel flanges prices across suppliers. Landed cost is what matters, not ex-works price.