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Duplex Steel S31803 Ferrule Fittings are highly durable and corrosion-resistant components designed for critical piping and instrumentation systems. Made from duplex stainless steel with a balanced microstructure of austenite and ferrite, these fittings deliver exceptional mechanical strength and toughness. They exhibit outstanding resistance to stress corrosion cracking, pitting, and crevice corrosion in chloride-rich environments. These properties make them suitable for offshore, chemical, and marine industries. The ferrule design ensures a tight, leak-proof connection, offering reliability even under high pressure and temperature conditions.
Manufactured as per ASTM A182 and ASME SA182 standards, Duplex Steel S31803 Ferrule Fittings combine high yield strength with excellent ductility. The alloy composition, containing chromium, molybdenum, and nitrogen, enhances corrosion and oxidation resistance, making it ideal for severe service conditions. These fittings can withstand both dynamic and static loads, ensuring consistent performance. Their excellent thermal conductivity and low thermal expansion improve system stability. They are available in a variety of designs such as unions, tees, elbows, and adapters to suit different industrial applications.
The superior corrosion resistance of Duplex Steel S31803 Ferrule Fittings makes them an excellent choice for use in chloride-containing environments like seawater systems and desalination plants. The duplex structure minimizes the risk of stress corrosion cracking, even in high-temperature and high-pressure conditions. These fittings also resist erosion and corrosion in acidic or alkaline solutions, ensuring long operational life. They are widely used in oil & gas exploration, petrochemical industries, and power generation units where reliability and safety are essential.
The ferrule design of Duplex Steel S31803 Fittings includes a front ferrule and a back ferrule that compress onto the tubing to form a robust, leak-tight seal. This dual ferrule mechanism ensures vibration resistance and thermal expansion control, reducing the risk of leakage or loosening during operation. Unlike welded joints, ferrule fittings allow easy disassembly and reassembly without damaging the tubing. The smooth internal surface of the fittings promotes efficient fluid flow, minimizing turbulence and pressure loss across the system.
Duplex Steel S31803 Ferrule Fittings are produced in various pressure ratings, sizes, and configurations to meet diverse industrial needs. They are available in both metric and imperial measurements, ensuring compatibility with global piping standards. These fittings undergo rigorous testing, including hydrostatic, pneumatic, and non-destructive testing, to guarantee strength and leak-proof performance. Their dimensional precision and high surface finish contribute to easy installation and reliable operation. They are commonly used in instrumentation lines, control systems, and hydraulic applications.
These fittings are highly valued for their ability to perform under harsh environmental conditions. They find applications in offshore platforms, chemical processing plants, refineries, and marine engineering systems. Duplex Steel S31803 combines strength and corrosion resistance, making it ideal for high-stress environments where standard stainless steels may fail. The fittings maintain excellent fatigue resistance and mechanical stability during cyclic operations. Their cost-effectiveness and longevity make them a preferred choice for industries seeking durable and efficient connection solutions.
Proper installation and maintenance are key to achieving the best performance from Duplex Steel S31803 Ferrule Fittings. Using compatible tubing materials and applying correct torque levels ensure a secure and leak-tight connection. Regular inspections help detect early signs of corrosion or mechanical wear, preventing system failures. These fittings provide a balance between strength, corrosion resistance, and cost efficiency. Their versatility and reliability make them a vital component in modern fluid and gas transfer systems across a wide range of industries.
Specification Table
| Specification | Details |
|---|---|
| Product | Duplex Steel S31803 Ferrule Fittings |
| Grade | Duplex Stainless Steel S31803 / 2205 |
| UNS | S31803 |
| WNR | 1.4462 |
| Standards | ASTM A182 / ASME SA182 |
| Type | Ferrule / Compression / Tube Fittings |
| Connection Type | Male, Female, Union, Bulkhead, Elbow, Tee, Cross |
| Size Range | 1/8" to 2" (Inch) / 3mm to 50mm (Metric) |
| Pressure Rating | Up to 6000 PSI (depending on size and design) |
| End Connections | NPT, BSP, BSPT, ISO, SAE, or Custom as per requirement |
| Temperature Range | -50°C to 300°C (-58°F to 572°F) |
| Surface Finish | Bright, Polished, or Custom Finish |
| Applications | Chemical Processing, Oil & Gas, Power Generation, Desalination Plants, Marine Equipment |
Chemical Composition (Typical ranges for SSS31803)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.03 |
| Chromium (Cr) | 21.0 – 23.0 |
| Nickel (Ni) | 4.5 – 6.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Nitrogen (N) | 0.08 – 0.20 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.020 |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Yield Strength (0.2% offset) | 450 – 550 MPa |
| Tensile Strength | 620 – 780 MPa |
| Elongation (in 50mm) | 25 – 35% |
| Hardness (Brinell) | ≥ 250 HB |
| Impact Toughness (Charpy V-Notch) | ≥ 40 J at 20°C |
| Modulus of Elasticity | 200 GPa |
| Density | 7.8 g/cm³ |
| Corrosion Resistance | Excellent resistance to chloride stress corrosion cracking, pitting, and crevice corrosion |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | S31803 |
| WNR / EN | 1.4462 |
| AISI / ASTM | Duplex 2205 |
| British Standard (BS) | EN 1.4462 |
| JIS | SNCD 2205 |
| DIN | 1.4462 |
| ISO | ASTM A182 F51 / Duplex 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.
| Size (Inch) | Size (mm) | Outer Diameter (OD) mm | Inner Diameter (ID) mm | Length mm | Weight per Piece (kg) |
|---|---|---|---|---|---|
| 1/8" | 3 | 9.5 | 4.5 | 25 | 0.02 |
| 1/4" | 6 | 12.7 | 7.0 | 30 | 0.04 |
| 3/8" | 10 | 16.0 | 10.0 | 35 | 0.06 |
| 1/2" | 12 | 21.3 | 15.0 | 40 | 0.09 |
| 3/4" | 20 | 26.7 | 19.0 | 50 | 0.14 |
| 1" | 25 | 33.4 | 25.0 | 60 | 0.20 |
| 1 1/4" | 32 | 42.2 | 33.0 | 70 | 0.35 |
| 1 1/2" | 40 | 48.3 | 38.0 | 80 | 0.45 |
| 2" | 50 | 60.3 | 50.0 | 90 | 0.70 |
Types Of Stainless Steel S31803 Ferrule Fittingss and Tubes
Stainless Steel Ferrule Fitting
Monel 400 Ferrule Fitting
Hastelloy Ferrule Fitting
Nickel Ferrule Fitting
Super Duplex Ferrule Fitting
Duplex Ferrule Fitting
Inconel 600 Ferrule Fitting
Monel K500 Ferrule Fitting
Frequently Asked Questions (FAQ)
What is Duplex Steel S31803?
Duplex Steel S31803, also known as Duplex 2205 or UNS S31803, is a high-strength, corrosion-resistant stainless steel with a balanced duplex microstructure of austenite and ferrite. It is commonly used in chemical, oil & gas, and marine applications.
What are ferrule fittings?
Ferrule fittings, also called compression fittings, are mechanical fittings used to connect tubes and pipes. They use a ferrule or sleeve to create a leak-proof seal without welding, ideal for high-pressure systems.
What are the key benefits of S31803 ferrule fittings?
S31803 ferrule fittings provide high tensile and yield strength, excellent corrosion resistance (including stress corrosion cracking and pitting), and durability in harsh environments.
Where are Duplex S31803 ferrule fittings commonly used?
These fittings are used in chemical processing, oil & gas pipelines, offshore platforms, marine equipment, desalination plants, and power generation systems where corrosion resistance and strength are critical.
What sizes are available for S31803 ferrule fittings?
Sizes typically range from 1/8" to 2" (3mm to 50mm), including various connection types such as male, female, union, elbow, tee, and cross fittings.
How do I maintain Duplex Steel S31803 fittings?
Regular cleaning to remove deposits and avoiding prolonged exposure to highly acidic or chlorinated environments helps maintain the corrosion resistance. Periodic inspection for wear and stress is recommended in critical applications.
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