Duplex Steel 2205 Flanges

Duplex Steel 2205 Flanges are made from a dual-phase alloy with roughly equal portions of austenite and ferrite. Designated UNS S32205 and produced per ASTM A182 F51, this is one of the most commonly specified duplex grades globally. The microstructure gives these flanges nearly twice the yield strength of standard austenitic stainless grades and better resistance to stress corrosion cracking in chloride environments. They offer a practical solution for oil and gas, offshore, and chemical applications requiring both mechanical load and corrosion resistance.

Price of Duplex Steel 2205 Flanges

Duplex 2205 flange pricing sits between standard stainless and higher nickel alloys. Size, flange type, and certification requirements are the main cost drivers.

Approx Price Range

Duplex Steel 2205 Flanges are generally priced between ₹5,000–₹30,000/piece. Pricing sits above standard 316L stainless flanges but well below super duplex or nickel alloy alternatives.

Price Per Unit / Kg

The per-kg price for duplex 2205 flanges typically falls between ₹260 and ₹500. Larger sizes, higher wall thicknesses, and non-standard pressure classes push the cost toward the upper range.

Factors Affecting Price

The main factor is the cost of the alloy because UNS S32205 contains chromium, nickel, and molybdenum. The flange geometry also matters. Weld neck and long weld neck types require more machining time and produce more waste material than simpler types like slip-on or blind flanges. There is also a cost premium for certifications such as NACE compliance for sour service or PED for European projects. The price varies directly with the quantity of the order. Suppliers of Duplex Steel 2205 Flanges offer better prices on large consolidated orders. Freight and import duties may be payable depending on the origin.

Types of Duplex Steel 2205 Flanges

Duplex 2205 flanges are produced in the following configurations:

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

Specifications of Duplex Steel 2205 Flanges

Listed below are the standard specification parameters for Duplex 2205 Flanges, including grade designation, applicable standards, pressure classes, and manufacturing details. 

Chemical Properties of Duplex Steel 2205 Flanges

The chemical composition of UNS S32205 flanges is tightly controlled, particularly for chromium and nitrogen, which directly influence pitting resistance and phase stability. 

Nitrogen content in S32205 is controlled at a minimum of 0.14%, which stabilises the austenite phase and contributes to a PREN value generally above 34.

Mechanical Properties of Duplex Steel 2205 Flanges

The values below reflect minimum mechanical requirements for Duplex 2205 Flanges tested in the solution-annealed condition, as specified under ASTM A182 F51. 

Physical Properties of Duplex Steel 2205 Flanges

Physical property reference data for UNS S32205 flanges used in thermal, structural, and electrical design calculations.

The slight magnetic response in duplex 2205 flanges is a normal result of the ferrite phase and does not indicate a material defect.

Duplex Steel 2205 Flanges Dimension Chart

Flange dimensions are as per ASME B16.5 for NPS ½" to 24". Larger sizes shall be as per ASME B16.47 Series A or Series B, as per project specification.

Duplex Steel 2205 Flanges Size Chart

The following table displays the available size range of Duplex Steel 2205 Flanges with stock availability and supply type by size range.

Bore dimensions across all sizes are determined by pipe schedule and pressure class at the time of order.

Pressure Rating Chart of Duplex Steel 2205 Flanges

Pressure ratings for Duplex Steel 2205 Flanges at 38°C per ASME B16.5. Ratings must be derated for higher temperatures using ASME tables.

Key Features of Duplex Steel 2205 Flanges

Duplex 2205 flanges combine mechanical strength with corrosion resistance, making them practical for a range of industrial and offshore applications.

• Yield strength is roughly twice that of 304 or 316 stainless grades
• High resistance to stress corrosion cracking in chloride media
• PREN above 34, suitable for moderately aggressive environments
• Slightly magnetic due to ferrite content
• Suitable for low-temperature service down to -40°C
• Dual-phase microstructure resists both corrosion and mechanical fatigue
• Available across all standard ASME pressure classes and flange types

Applications of Duplex Steel 2205 Flanges

Duplex Steel 2205 Flanges are used wherever standard stainless steel falls short on both strength and corrosion resistance.

• Oil and gas pipelines and processing equipment
• Offshore platforms and subsea systems
• Heat exchangers and pressure vessels
• Chemical plant piping handling corrosive media
• Desalination systems and seawater handling
• Pulp and paper digesters
• Food and beverage processing equipment

UNS S32205 flanges are specified across these sectors primarily because of their resistance to chloride-induced corrosion, combined with higher mechanical strength.

How to Choose the Right Duplex Steel 2205 Flanges Supplier?

Picking the right duplex 2205 flange supplier is about more than price. The results of a project depend on the traceability of materials, the compliance with the requirements of heat treatment, and the quality of the documentation.

Supplier Selection Criteria

All suppliers shall manufacture or source from mills with certified UNS S32205 material with complete traceability. Preferably, dedicated duplex stock suppliers are used rather than general distributors, as lead times and quality consistency are generally better. Ask for sample MTCs from the latest production batches before ordering large quantities.

Technical Considerations

Check that flanges are solution-annealed as required by ASTM A182. For sour gas or H2S environments, NACE MR0175/ISO 15156 compliance is required. The phase balance is directly affected by heat treatment conditions, so the ferrite content in the finished flange should be within the expected range. Please confirm flange type, facing, and bore before ordering.

Quality & Certification Check

Check Minimum 3.1 MTCs from Duplex Steel 2205 Flanges suppliers, 3.2 for critical applications. ISO 9001 is a given. PED compliance is important for European projects. Third-party inspection from DNV, Lloyd's, or Bureau Veritas is common on offshore and oil and gas projects.

Procurement Tips for Bulk Orders

Get your complete flange schedule together before approaching suppliers so they can quote accurately. Duplex 2205 Flanges above 24” may not always be in stock, so confirm lead times early. Suppliers of Duplex Steel 2205 Flanges generally offer better pricing when more than one type of flange is purchased under a single purchase order.