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Manufacturer and exporter of ASTM A182 UNS S31803 Slip On Flange, check Duplex Steel 2205 Plate Flanges, Duplex UNS S32205 Slip On Flange, ASTM A182 F53 Flanges manufacturer in India

Duplex 2205 Flange Specification


Specification: ASTM A182 / ASME SA182

Size: 1/2" (15 NB) to 48" (1200NB)

JIS: 5K, 10K, 16K, 20K, 30K, 40K, 63K

Dimension Standard: ANSI, ASME, BS, DIN, EN etc.

Type: Ring Joint Flange (RTJ), Flat Face Flange (FF),

Raised Face Flange (RF), Male and Female Flange (M & F),

Lap Joint Flange, Large and Small Tongue-and-Groove Flange (T & G)

Pressure rating: 150#, 300#, 600#, 900#, 1500#, 2500#,

PN6, PN10, PN16, PN25, PN40, PN64 etc.


Due to their exceptional properties and performance, duplex steel flanges, specifically S31803 and S32205 grades, are widely used in various industries. These grades belong to the duplex stainless steel family, which exhibits a unique combination of austenitic and ferritic microstructures. Let's delve into the properties of each grade individually.


S31803 is a popular duplex steel grade known for its excellent corrosion resistance, particularly in chloride-containing environments. It offers high tensile strength and good toughness, making it suitable for applications where strength and durability are crucial. The grade also demonstrates good weldability, allowing for easy fabrication and installation. S31803 flanges are commonly used in chemical processing plants, oil and gas industries, and marine applications, where corrosion resistance and reliability are paramount.


On the other hand, S32205 is a higher-strength variant of duplex steel, often referred to as "lean duplex." It exhibits improved resistance to stress corrosion cracking, making it suitable for aggressive media applications and high temperatures. The increased strength of S32205 allows for weight reduction in structures without compromising structural integrity. This grade is widely used in petrochemical, pulp and paper industries, and offshore oil and gas production.


Both S31803 and S32205 duplex steel flanges possess excellent mechanical properties, including high yield and tensile strength and good impact resistance. They offer superior resistance to pitting, crevice corrosion, and general corrosion, even in environments where traditional stainless steel would fail. These properties are attributed to chromium, molybdenum, and nitrogen alloy composition.


Incoloy 825 Flanges Specifications


Size Chart 1/2" (15 NB) to 48" (1200NB) DN10~DN5000
Standards API7S-15, API7S-43, API605, ANSI/ASME B16.5, B16.47 Series A & B, B16.48, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, BS4504, BS 10, EN-1092, DIN, ANSI Flanges, GOST Flange, ASME/ANSI B16.5/16.36/16.47A/16.47B, MSS S44, ISO70051, JISB2220, BS1560-3.1, EN1092
JIS 5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K
UNI 6Bar 10Bar 16Bar 25Bar 40Bar
Pressure Rating ANSI 600 LBS, 900 LBS, 150 LBS, 2500 LBS, 300 LBS, 1500 LBS
Pressure Calculation in DIN 16Bar 6Bar 25Bar 40Bar 10Bar / PN10 PN16 PN6 PN25 PN64 PN40
EN 6Bar 10Bar 16Bar 25Bar 40Bar
Coating Anti-rust Paint, Zinc Plated,Oil Black Paint, Cold and Hot Dip Galvanized, Yellow Transparent
Production technique
  • Forged, Heat treated and machined
Connect Type/ Flange Face Type Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Raised Face (RF), Lap-Joint Face (LJF), Small Male-Female (SMF), Small Tongue, Large Tongue & Groove, Groove
Equipment Bending machine, Pushing Machine,Press machine, electric bevelling machine, Sand-blasting machine etc
Origin Indian / West Europe / Japan / USA / Korean
Special design

As per your drawing

AS, ANSI, BS, DIN and JIS
15 NB (1/2") to 200 NB (8")
Equal and Reducing Configurations

Test Hydrostatic testing machine, X-ray detector, Direct-reading Spectrograph, UI trasonic flaw detector, Magnetic particle detector
Most common types Forged / Threaded / Screwed / Plate
Test Certificates EN 10204/3.1B
Raw Materials Certificate
100% Radiography Test Report
Third Party Inspection Report, etc
Manufacturer of

ANSI DIN, GOST, JIS, UNI, BS, AS2129, AWWA, EN, SABS, NFE etc.
: -BS Flange, EN Flange, API 6A Flange, ANSI Flange, ASME Flange, DIN Flange, EN1092-1 Flange, UNI Flange, JIS/ KS Flange, BS4504 Flange, GB Flange, AWWA C207 Flange, GOST Flange, PSI Flange

  • B.S: BS4504 , BS3293, BS1560, BS10
  • German (DIN)
  • AS 2129: Table D; Table E; Table H
  • ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48
  • ANSI : ANSI B16.5, ANSI B16.47(API605), MSS SP44, ANSI B16.36, ANSI B16.48
  • American standard (ANSI)
  • British standard (BS)
  • ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
  • DIN: DIN 2527, DIN 2566, DIN 2573, DIN 2576, DIN 2641, DIN 2642, DIN 2655, DIN 2656, DIN 2627, DIN 2628, DIN 2629, DIN 2631, DIN 2632, DIN 2633, DIN 2634, DIN 2635, DIN 2636, DIN 2637, DIN 2638
  • The other standard: AWWA C207; EN1092-1, GOST12820, JIS B2220; KS B1503, SABS1123; NFE29203; UNI2276
Uses & application
  • Nuclear power (mostly seamless).
  • Bitumen upgraders.
  • Petrochemicals and acids.
  • Heavy oil refineries.
Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2, Test Certificates certifying NACE MR0103, NACE MR0175

Furthermore, duplex steel flanges exhibit good fatigue strength, essential for applications subjected to cyclic loading and vibrations. They maintain their mechanical properties over various temperatures, ensuring reliable performance in extreme conditions.


At our company, we take utmost care in packaging Duplex Steel S31803/S32205 flanges to ensure their safe delivery. Each flange is meticulously wrapped and secured to prevent any damage during transportation. We use high-quality packaging materials that protect against moisture, impact, and other external factors, ensuring that the flanges reach our customers in perfect condition.

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