Incoloy Flanges

Incoloy flanges, also referred to as nickel-iron-chromium alloy flanges or high-temperature pipe flanges, are forged pipe connection components manufactured from the Incoloy superalloy family. The base composition includes nickel (30–45%), chromium (19–23%), and iron (39.5% for Incoloy 800), with molybdenum, copper, and titanium additions that vary by grade. Incoloy 825, for example, delivers a tensile strength of 586 MPa, a yield strength of 241 MPa, and a melting point of approximately 1400°C. These flanges resist oxidation, carburisation, chloride-induced stress-corrosion cracking, and pitting. Engineers specify Incoloy flanges across chemical processing, marine engineering, heat exchangers, oil and gas pipelines, and power generation plants where carbon steel or standard stainless steel cannot perform reliably.

Incoloy Flanges Prices

Incoloy flange prices are not fixed. The final cost shifts with alloy grade, flange geometry, pressure class, and procurement volume. Two variables matter most: the base nickel-iron alloy cost on the purchase date and the dimensional and testing requirements attached to your order.

Approximate Price Range

Standard Incoloy flanges are priced between Rs 1,875 and Rs 3,125 per piece. That range covers common sizes in Incoloy 800 and Incoloy 825. Grades like Incoloy 925, sizes above 24" NB, or flanges with NACE certification will sit above that bracket.

Factors Affecting Price

6 factors directly move the final price: alloy grade, flange size, pressure class, wall thickness, order quantity, and required third-party testing. PMI, radiography, and hydrostatic testing each add cost. Forged flanges cost more than cast. Tight-tolerance bore machining adds lead time and price. For long projects, locking in a forward purchase agreement with your Incoloy flanges supplier is the most reliable way to control procurement costs.

Incoloy Flange Grades

Incoloy flanges are available in 3 standard grades. Each grade is engineered for a specific combination of temperature range, corrosion environment, and mechanical strength. Select the right grade at the design stage.

• Incoloy 925 Flanges
• Incoloy 825 Flanges
• Incoloy 800 Flanges

Types of Incoloy flange

Incoloy flanges are produced in 9 connection types. The correct type depends on pipe schedule, pressure class, and whether the line needs to be broken for maintenance or inspection.

• Weld Neck Flanges
• Slip-On Flanges
• Blind Flanges
• Socket Weld Flanges
• Lap Joint Flanges
• Threaded Flanges
• Long Weld Neck Flanges
• Spectacle Blind / Spacer / Ring Spacer Flanges
• Reducing Flanges

Incoloy Flanges Specifications

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

Incoloy Flanges Size Chart

Incoloy flanges are manufactured and stocked from 1/2" NB up to 48" NB. The chart below maps each NPS designation to its corresponding DN equivalent and standard size range.

Schedule Chart of Incoloy flanges

Allowable working pressure drops as operating temperature rises. Use this pressure-temperature rating table covering Class 150 through Class 2500 to confirm your flange selection before finalising the design.

Key Features Of Incoloy Flange

Incoloy flanges outperform carbon steel and standard stainless steel in demanding service conditions where heat, corrosion, and mechanical stress combine. The 5 properties below define their core performance advantages.

• Corrosion Resistance
• High-Temperature Stability
•  Strength and Durability
•  Oxidation Resistance
• Dimensional Precision

Applications of Incoloy Flanges

Incoloy flanges are specified wherever standard flanges fail in aggressive media, high heat, or corrosive environments. Below are the 10 commonly used industries, which include:

• Petrochemical Industry
• Power Generation 
• Aerospace
• Marine Engineering
• Oil and Gas Industry
• Heat Exchangers
• Chemical Processing
• Nuclear Engineering
• Pulp and Paper Industry
• Food Processing

How To Choose The Right Incoloy Flanges Supplier And Manufacturer?

The quality of an Incoloy 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. Use these 4 criteria to evaluate before placing an order.

Selecting The Right Supplier And Manufacturer

Work with an Incoloy flanges manufacturer that forges in-house. Third-party sourcing introduces traceability gaps and ensures that the manufacturer holds ISO 9001 certification 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, such as oil and gas, marine, or chemical processing. Nuclear procurement standards are non-negotiable benchmarks. Check export experience. An Incoloy flanges supplier with a track record of international shipments maintains better documentation and packing standards than one serving only the domestic market.

Procurement Strategy

Try to get a set price based on the LME nickel rate for bulk projects. Prior to placing an urgent order, confirm the availability of stock and the estimated time of delivery. When comparing Incoloy flange prices, take into account inspection, packaging, and freight costs as well. The final cost is more significant than the basic ex-works price.