Duplex & Super Duplex Flanges

ASTM A182 Duplex Steel UNS S32205 Blind Flanges, Super Duplex Steel DIN 1.4410 Slip on Flanges Suppliers in India.

Duplex Steel S31803 Orifice Flanges, Super Dupex UNS S32750 Weld Neck Flanges Exporter, Super Duplex Steel SWRF Flanges Leading Manufacturers.

AB Steel is one of the largest exporter, manufacturer and supplier of Duplex and Super Duplex Steel Flanges in India.To achieve the differentiated requirements of our customers, we provide these Duplex Steel UNS S31803 fasteners in a number of specifications.These Super Duplex Steel UNS S32750 flanges are technologically advanced under the direction of skilled specialists by making use of the premium quality of materials. These Super Duplex Steel UNS S32760flanges are having certainoutstanding features such as Resistance to plastic distortion, Wear resistance, Chipping resistance, Good machinability and grind ability,Complete cracking resistance, Excellent Fabric ability, Tough and Strong Construction, Hard-wearing, High tensile strength, and so on.

Our offered Super Duplex Steel UNS S32950 Flanges are quite engineered by using finest available methods.Our Duplex Steel UNS S32205 Flanges are accessible to our valuable customers in different and customized range of diameters, wall thicknesses and sizes at market leading prices.

Duplex and super duplex steel flanges occupy a distinct position in industrial piping, combining the corrosion resistance of austenitic grades with the mechanical strength of ferritic steel. Manufactured to ASTM A182 and ASME SA182 in grades F51, F53, and F55, these flanges offer high PREN values, making them suitable for chloride-rich and offshore environments where standard stainless steel grades are inadequate.

AB Steel manufactures and supplies these flanges in sizes from 1/8" to 24" NB across pressure classes from 150# to 2500#, available in raised face, flat face, and ring type joint configurations. All products conform to NACE MR0175/ISO 15156.

ANSI / ASME B16.5 Duplex and Super Duplex Steel Flanges Specification

Dimensions : ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc.

Standards : ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc.

Specifications : ASTM A182 / ASME SA182

Size : 1/8" NB TO 24" NB

Class / Pressure : 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.

Grade : A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61

Flange Face Type : Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)

Our Duplex & Super Duplex Steel Flanges conforms to NACE MR0175/ISO 15156

ASTM A182 Duplex and Super Duplex Steel Flanges Equivalent Grades

Applications of Duplex and Super Duplex Steel Flanges

Duplex and super duplex flanges are specified where simultaneous exposure to mechanical stress and aggressive corrosive media rules out single-phase austenitic or carbon steel alternatives.

• Oil & Gas

  Duplex flanges are used in offshore installations for subsea flowlines, wellhead assemblies and topside process piping because of their resistance to chloride stress corrosion cracking under sustained high pressure.

• Desalination Facilities

  Super duplex flanges in UNS S32750 are required for brine handling lines and high-salinity feed water circuits where the combination of elevated temperature and chloride concentration would rapidly degrade standard austenitic grades.

• Chemical Processing

  Reactor feed lines and heat exchanger connections carrying halide-containing or acidic media rely on duplex steel flanges for long service intervals without premature pitting or seal face deterioration.

• Pulp & Paper

  Duplex flanges have better corrosion resistance and mechanical fatigue life than 316L in handling corrosive process liquors at elevated temperatures in bleaching and chemical recovery circuits.

• Power production

  Duplex flanges are used in flue gas desulphurisation systems and in cooling water circuits for chloride-laden media under cyclic pressure, where they are able to provide stable dimensional and sealing performance over long service periods.

• Marine and Shipbuilding

  Super duplex flanges are made from S32760 or S32750 steel grades. They are used in seawater piping systems, ballast lines, and offshore structural connections because they resist biofouling and galvanic corrosion in salty environments.

Types Of Available Products AISI, ASME, ASTM, DIN, BS, EN, Duplex and Super Duplex Steel Flanges

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