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Duplex Steel S31803 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 S31803 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 S31803 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 S31803 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 S31803 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, S31803 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 S31803 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 S31803 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 S31803 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 | Details |
|---|---|
| Material Grade | Duplex Stainless Steel S31803 / UNS S31803 / Duplex 2205 |
| Standards | ASME / ASTM / ANSI / DIN / EN / BS / ISO |
| Flange Types | Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, Long Weld Neck, Spectacle Blind |
| Size Range | ½” to 48” (DN15 to DN1200) |
| Pressure Class | 150#, 300#, 600#, 900#, 1500#, 2500# & PN6–PN400 |
| Face Type | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Standard Compliance | ASME B16.5, ASME B16.47 Series A & B, MSS SP-44, BS 4504, EN 1092-1, DIN 2633 |
| Manufacturing Process | Forged / Machined / Heat Treated / CNC Finished |
| Surface Finish | Rust Preventive Oil Coated / Shot Blasted / Cold & Hot Dipped Galvanized |
| Test Certificates | EN 10204 3.1 / 3.2, NACE MR0175, MTC Certified |
| Applications | Oil & Gas, Chemical Processing, Marine, Power Generation, Heat Exchangers, Desalination Plants |
Chemical Composition (Typical ranges for SSS31803)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 21.0 – 23.0 |
| Nickel (Ni) | 4.5 – 6.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Carbon (C) | ≤ 0.030 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.020 |
| Nitrogen (N) | 0.08 – 0.20 |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Property | Value | Units |
|---|---|---|
| Tensile Strength (min) | 620 | MPa |
| Yield Strength (0.2% Proof, min) | 450 | MPa |
| Elongation (min) | 25 | % |
| Hardness (max) | 290 | HB |
| Impact Strength (Charpy V-Notch) | ≥ 100 | J |
| Modulus of Elasticity | 200 | GPa |
| Density | 7.80 | g/cm³ |
| Melting Range | 1350 – 1450 | °C |
| Thermal Conductivity (at 100°C) | 19 | W/m·K |
| Coefficient of Thermal Expansion (0–100°C) | 13.7 × 10⁻⁶ | /°C |
Equivalent Grades
| STANDARD | GRADE |
|---|---|
| UNS | S31803 / S32205 |
| Werkstoff Nr. | 1.4462 |
| AFNOR | Z3 CrNiMoN 22.05.03 |
| EN | X2CrNiMoN22-5-3 |
| BS | 318S13 |
| JIS | SUS 329J3L |
| GOST | 08Х22Н6Т |
| Other Trade Names | Duplex 2205, Alloy 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.
| Nominal Pipe Size (NPS) | Outside Diameter of Flange (mm) | Thickness (mm) | Raised Face Dia. (mm) | Bore (mm) | Approx. Weight (kg) |
|---|---|---|---|---|---|
| ½” | 90 | 11.2 | 35 | 15 | 0.6 |
| ¾” | 100 | 12.7 | 42 | 20 | 0.8 |
| 1” | 110 | 14.3 | 51 | 25 | 1.0 |
| 1¼” | 115 | 15.9 | 64 | 32 | 1.3 |
| 1½” | 125 | 17.5 | 73 | 40 | 1.8 |
| 2” | 150 | 19.1 | 92 | 51 | 2.8 |
| 3” | 190 | 23.9 | 127 | 77 | 5.6 |
| 4” | 228 | 23.9 | 157 | 102 | 7.4 |
| 6” | 279 | 25.4 | 216 | 154 | 11.3 |
| 8” | 343 | 28.6 | 270 | 202 | 18.1 |
| 10” | 406 | 30.2 | 324 | 254 | 26.3 |
| 12” | 483 | 31.8 | 381 | 303 | 38.1 |
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 S31803?
Duplex Steel S31803 is a dual-phase stainless steel combining austenitic and ferritic structures. It offers excellent strength, superior corrosion resistance, and outstanding resistance to chloride stress corrosion cracking. It is also known by its trade name, Duplex 2205.
What are the common types of Duplex Steel S31803 Flanges?
The most commonly used types include Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, and Spectacle Blind flanges. Each type serves specific piping connection requirements and pressure ratings.
Where are Duplex S31803 Flanges used?
These flanges are used in oil and gas processing, chemical industries, desalination plants, pulp and paper, marine engineering, power generation, and offshore platforms where strength and corrosion resistance are critical.
What are the advantages of using Duplex Steel S31803 Flanges?
Key advantages include high tensile and yield strength, excellent resistance to pitting and crevice corrosion, superior toughness, reduced weight due to thinner sections, and low maintenance requirements compared to standard stainless steels.
Are Duplex S31803 and S32205 the same?
Yes, S32205 is an improved version of S31803 with slightly higher nitrogen content, providing enhanced corrosion resistance and better mechanical properties. They are often considered interchangeable in many industrial applications.
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