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Duplex Steel S32205 Flanges are engineered from austenitic-ferritic stainless steel that provides an excellent combination of strength and corrosion resistance. This grade, also known as Duplex 2205, is widely used across industries where durability, mechanical integrity, and resistance to aggressive media are crucial. The dual-phase microstructure makes these flanges highly reliable in demanding environments such as offshore oil fields, desalination plants, and chemical process equipment.
One of the key advantages of Duplex S32205 flanges is their high yield strength—approximately twice that of standard austenitic stainless steels like 304 or 316. This allows designers and engineers to use thinner sections without compromising structural integrity, resulting in cost efficiency and reduced overall weight. These flanges maintain their mechanical properties even in challenging conditions involving high pressure and temperature variations.
Duplex Steel S32205 exhibits excellent resistance to chloride stress corrosion cracking, pitting, and crevice corrosion. This makes it particularly suitable for marine environments and applications involving chloride-bearing solutions. The material’s outstanding resistance to sulphide stress corrosion further enhances its performance in sour gas and offshore platforms, where corrosion and stress failures are a major concern.
Duplex Steel S32205 Flanges are available in several types including Weld Neck (WN), Slip-On (SO), Blind (BL), Socket Weld (SW), Threaded (TH), and Lap Joint (LJ) flanges. Each flange type is designed to meet specific piping connection requirements, ensuring leak-proof performance and ease of maintenance. They are manufactured in accordance with international standards such as ASME, ANSI, DIN, and EN, ensuring compatibility with global piping systems.
The combination of chromium, molybdenum, and nitrogen in Duplex S32205 enhances its corrosion resistance and mechanical strength. The alloy typically contains around 22% chromium, 5–6% nickel, and 3% molybdenum, with balanced ferrite and austenite phases. This composition provides exceptional resistance to intergranular corrosion and oxidation, even when exposed to oxidizing and reducing environments.
In terms of mechanical properties, S32205 Duplex Steel Flanges offer high tensile strength, yield strength, and impact toughness. The excellent fatigue strength and low thermal expansion coefficient make them suitable for heat exchangers, pressure vessels, and structural components exposed to cyclic stresses. These mechanical advantages contribute to the long-term reliability of process systems using Duplex flanges.
Duplex Steel S32205 Flanges are commonly used in industries such as petrochemical, chemical processing, pulp and paper, oil and gas, and power generation. Their versatility extends to heat exchangers, pipelines, seawater cooling systems, and evaporators. They perform exceptionally well in chloride-rich and acidic environments, offering a superior alternative to conventional stainless steel flanges.
Maintenance requirements for Duplex S32205 are relatively low due to its superior corrosion resistance and structural strength. Unlike carbon steel or standard stainless grades, these flanges do not require frequent inspection or replacement, reducing downtime and lifecycle costs. This property makes them a preferred choice for large-scale industrial applications requiring long-term reliability and cost efficiency.
All Duplex S32205 flanges undergo stringent quality checks and are supplied with mill test certificates as per EN 10204 3.1 or 3.2 standards. Manufacturers ensure precise dimensional accuracy and smooth surface finish, enhancing sealing performance when used with gaskets or companion flanges. Custom sizes and special face finishes such as raised face (RF), flat face (FF), and ring type joint (RTJ) are available to meet project specifications.
Specification Table
| Specification Table: Duplex Steel S32205 Flanges | |
|---|---|
| Product Name | Duplex Steel S32205 Flanges |
| Grade | UNS S32205 / UNS S31803 (Duplex 2205) |
| Standards | ASTM A182 / ASME SA182 |
| Type | Weld Neck, Slip On, Blind, Socket Weld, Threaded, Lap Joint, Ring Type Joint (RTJ), Long Weld Neck |
| Size Range | ½” to 48” (DN15 to DN1200) |
| Pressure Rating | Class 150, 300, 400, 600, 900, 1500, 2500 / PN6 – PN400 |
| Face Type | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Form | Forged, Plate, Cast |
| Connection Type | Welded, Threaded, Screwed |
| Applications | Oil & Gas, Chemical Processing, Marine, Heat Exchangers, Pulp & Paper, Desalination Plants, Power Generation |
| End Finish | Smooth Finish, Serrated Finish, Mirror Finish |
| Origin | Indian / European / Japanese / USA Make |
Chemical Composition (Typical ranges for SSS32205)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Chemical Composition: Duplex Steel S32205 Flanges (wt%) | |
|---|---|
| Element | Composition (wt%) |
| Carbon (C) | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.03 |
| Sulfur (S) | ≤ 0.02 |
| Chromium (Cr) | 22.0 – 23.0 |
| Nickel (Ni) | 4.5 – 6.5 |
| Molybdenum (Mo) | 3.0 – 3.5 |
| Nitrogen (N) | 0.14 – 0.20 |
| Copper (Cu) | 0.5 – 1.0 |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Mechanical Properties: Duplex Steel S32205 Flanges | |
|---|---|
| Property | Value |
| Tensile Strength (MPa) | 620 – 850 |
| Yield Strength (0.2% Proof, MPa) | 450 – 550 |
| Elongation (%) | 25 – 35 |
| Hardness (HB) | ≤ 290 |
| Impact Toughness (Charpy V-Notch, J) | > 80 @ -46°C |
| Density (g/cm³) | 7.8 |
| Modulus of Elasticity (GPa) | 200 |
| Thermal Conductivity (W/m·K) | 16.2 |
| Maximum Operating Temperature | ≈ 300°C (continuous service) |
Equivalent Grades
| Equivalent Grades: Duplex Steel S32205 Flanges | ||
|---|---|---|
| Standard | Grade / Designation | Notes |
| UNS | S32205 | Also known as UNS S31803 (earlier designation) |
| EN / DIN | 1.4462 | European standard equivalent |
| ASTM / ASME | A182 F51 | Common specification for flanges, fittings, and forgings |
| JIS | – | Not commonly used in Japanese standard |
| ISO | 2205 | Duplex 2205 stainless steel equivalent |
| SAE / AISI | – | Not officially designated, often referred to as 2205 |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Dimension & Weight Chart: Duplex Steel S32205 Flanges | ||||||||
|---|---|---|---|---|---|---|---|---|
| Nominal Size (in) | DN | Outside Diameter (OD, mm) | Thickness (mm) | Bolt Circle Diameter (mm) | No. of Holes | Hole Diameter (mm) | Raised Face (RF) Height (mm) | Approx. Weight (kg) |
| ½" | 15 | 95 | 16 | 70 | 4 | 14 | 2 | 0.8 |
| 1" | 25 | 120 | 18 | 85 | 4 | 18 | 2 | 1.5 |
| 2" | 50 | 165 | 20 | 125 | 4 | 18 | 2 | 3.5 |
| 4" | 100 | 230 | 24 | 185 | 8 | 18 | 2 | 8.5 |
| 6" | 150 | 285 | 26 | 240 | 8 | 22 | 2 | 15.0 |
| 8" | 200 | 360 | 30 | 295 | 8 | 22 | 2 | 25.0 |
| 10" | 250 | 445 | 34 | 360 | 12 | 22 | 2 | 40.0 |
| 12" | 300 | 520 | 36 | 425 | 12 | 22 | 2 | 60.0 |
| 16" | 400 | 635 | 40 | 540 | 16 | 26 | 2 | 105.0 |
| 24" | 600 | 925 | 50 | 730 | 20 | 30 | 2 | 220.0 |
Common Types Of Flangess
Ring Flanges
Type of Flanges
General Flanges
Stainless Steel Pipe Flanges
ASME B16.5 Flanges
Stainless Steel Flanges
Frequently Asked Questions (FAQ)
What is Duplex Steel S32205?
Duplex Steel S32205, also known as UNS S32205 or Duplex 2205, is a stainless steel alloy with a balanced austenitic-ferritic microstructure. It offers high strength and excellent resistance to corrosion, especially against chloride-induced stress corrosion cracking.
What types of flanges are available in S32205?
S32205 flanges are available in various types including Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, Ring Type Joint (RTJ), and Long Weld Neck flanges.
What are the applications of Duplex S32205 flanges?
They are widely used in chemical processing, oil & gas, desalination plants, marine environments, heat exchangers, pulp & paper industry, and power generation, where high strength and corrosion resistance are essential.
What standards do S32205 flanges comply with?
Duplex S32205 flanges comply with ASTM A182 / ASME SA182 standards and are also referred to in European EN 1.4462 and ISO 2205 equivalents.
What is the chemical composition of Duplex S32205 flanges?
Major elements include: Carbon ≤ 0.03%, Chromium 22-23%, Nickel 4.5-6.5%, Molybdenum 3.0-3.5%, Nitrogen 0.14-0.20%, Manganese ≤ 2%, Silicon ≤ 1%, with Iron as the balance.
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