ASTM A182 F55 Blind Flange

Super Duplex UNS S32760 Blind Flange | ASME B16.5

ASTM A182 F55 blind flanges, manufactured from Super Duplex Stainless Steel UNS S32760, are forged high-performance flanges designed to close the end of piping systems, valves, or pressure vessel nozzles in high-pressure and highly corrosive environments.
Produced in accordance with ASME B16.5, these blind flanges provide exceptional strength, excellent sealing performance, and outstanding resistance to aggressive corrosion.

Super Duplex A182 F55 Flange, ASTM A182 F55 Flange,super Duplex S32760 flange / 1.4501 Flange

Super Duplex S32760 Flange , Super Duplex Alloy UNS S32760 (F55 / 1.4501) has excellent resistance Pitting and Crevice Corrosion in seawater at elevated temperatures, supplied with a PREN 40<( Pitting Resistance Eqv) . Excellent resistance to SCC ( Stress Corrosion Cracking) in Sour and Chloride environments .

Providing higher strengths than both austenitic and 22% Cr Duplex Stainless Steels UNS S32760 (F55) is suited to a variety of applications in industries such as Oil & Gas, CPI(Chemical Processing Industries), and Marine environments.

Thanks to the superior alloy composition of UNS S32760, F55 blind flanges are widely used in offshore oil & gas, subsea systems, seawater pipelines, and chemical processing facilities.

What Is ASTM A182 F55 (UNS S32760)?

ASTM A182 covers forged alloy and stainless steel flanges for pressure service.
Grade F55 corresponds to UNS S32760, a super duplex stainless steel with a balanced austenitic–ferritic microstructure and enhanced alloying elements.

Compared with UNS S32750 (F53), UNS S32760 contains additional copper and tungsten, offering improved corrosion resistance in seawater and chloride-rich environments.

Equivalent Grades

Chemical Composition of UNS S32760 (Typical)

Mechanical properties 

Corrosion Resistance & PREN

UNS S32760 offers a PREN value ≥ 40, providing outstanding resistance to:

• Pitting corrosion

• Crevice corrosion

• Stress corrosion cracking (SCC)

• Seawater and chloride-containing media

This makes ASTM A182 F55 blind flanges ideal for marine, offshore, and subsea applications.

Blind Flange Design

Blind flanges are solid flanges without a bore and are used to:

• Positively isolate piping systems

• Allow future pipeline expansion

• Withstand full system pressure

When manufactured from Super Duplex UNS S32760, blind flanges deliver maximum reliability in pressure-critical and corrosive services.

Dimensions & Standards

• Material Standard: ASTM A182 / ASME SA182 F55

• Flange Standard: ASME B16.5

• Size Range: 1/2″ – 24″

• Pressure Classes:

  • Class 150

  • Class 300

  • Class 600

  • Class 900

  • Class 1500

  • Class 2500

• Facing Types: RF, RTJ

• Manufacturing Process: Forged

Inspection & Quality Control

ASTM A182 F55 blind flanges are supplied with comprehensive inspection and testing, including:

• Chemical composition analysis

• Mechanical property testing

• Ferrite content control

• PMI (Positive Material Identification)

• Dimensional inspection

• Visual examination

• Corrosion-related testing (if required)

• Certification: EN 10204 3.1 / 3.2

Applications

• Offshore oil & gas platforms

• Subsea and seawater piping systems

• Desalination plants

• Chemical and petrochemical facilities

• High-pressure, high-corrosion pipelines

ASTM A182 F55 blind flanges manufactured from Super Duplex UNS S32760 provide an exceptional combination of high strength, superior corrosion resistance, and long service life.
Compliant with ASME B16.5, these blind flanges are a reliable choice for critical offshore, subsea, and chemical processing applications.

Related Products

• ASTM A182 F55 Weld Neck Flanges

• Super Duplex UNS S32750 (ASTM A182 F53) Flanges