High Quality Duplex Steel Buttweld Pipe Fittings
S31803/S32205 • Strength • Sealing • Durability
Get a QuotePremium Duplex Steel S31803/S32205 Buttweld Pipe Fittings by Ratnadeep Steel & Engg. Co.
Ratnadeep Steel & Engg. Co. is a trusted manufacturer, exporter, and supplier of Duplex Steel S31803/S32205 Buttweld Pipe Fittings. Crafted from high-performance duplex stainless steel, these fittings offer an exceptional combination of corrosion resistance, high strength, and durability, making them ideal for demanding industrial environments.
Duplex Stainless Steel S31803/S32205 is engineered for superior resistance to stress corrosion cracking, pitting, and crevice corrosion, while providing nearly twice the strength of standard austenitic stainless steels. This makes it suitable for critical applications in chemical processing, oil & gas, petrochemical plants, seawater systems, and pulp & paper industries. Our buttweld fittings feature precision-beveled ends for full-penetration welding, ensuring strong, leak-proof, and long-lasting joints.
Designed to promote smooth internal flow, reduce turbulence, and improve operational efficiency, our duplex steel buttweld pipe fittings are ideal for pipelines, pressure vessels, heat exchangers, and other industrial systems requiring reliable performance in aggressive environments. Choose Ratnadeep Steel & Engg. Co. for premium-quality Duplex Steel S31803/S32205 buttweld fittings that comply with international standards and industrial specifications.
- Duplex Steel 90° Elbow
- UNS S31803 45° Elbow
- UNS S32205 180° Elbow
- Duplex 2205 LR Elbow
- DIN 1.4462 SR Elbow
- ANSI B16.9 Duplex Steel 90° Short Radius Elbow
- Duplex Steel 45° Long Radius Elbow
- ASME B16.9 Duplex Steel S31803 Equal Tee
- UNS S32205 Pipe Tee
- DIN 1.4462 Butt weld Tee
- Duplex Steel ASME SA815 Reducing Tee manufacturer
- Duplex Steel Unequal Tee
- 2205 Duplex Straight Tee
- Duplex Steel ASTM A815 Eccentric Reducer Supplier
- B16.9 Duplex Steel S31803 Eccentric Reducer
- Duplex UNS S32205 Eccentric Reducers
- DIN 1.4462 Eccentric Reducer
- ANSI B16.9 Duplex Steel S31803 Concentric Reducer
- ASME SA815 Duplex Steel S32205 Concentric Reducer
- 2205 Duplex Steel ASTM A815 Concentric Reducers
- DIN 1.4462 Concentric Reducer
- ASME B16.9 Duplex Steel S31803 Long Stub End Supplier
- Duplex 2205
- ASTM A815 Duplex Steel S32205 Long Stub Ends
- Duplex Steel Lap Joint Stub End
- DIN 1.4462 Long Stub End
- ASTM A815 / SA815 Duplex Steel Short Stub End Supplier
- ASME B16.9 Duplex Steel S32205 Short Stub Ends
- UNS S31803 Short Stub Ends
- Duplex 2205
- DIN 1.4462 Short Stub End
- ASME SA815 Duplex Steel S31803 Pipe Cap Supplier
- ASME B16.9 Duplex Steel End Pipe Cap
- Duplex ASTM A815 Pipe End Cap Manufacturer
- UNS S32205 Buttweld Cap
- DIN 1.4462 End Cap
- ASTM A815 / SA815 Duplex Steel S31803 Equal Cross
- ASME B16.9 Duplex Steel S32205 Buttweld Cross
- Duplex Steel 2205 Unequal Cross
- Duplex Steel Pipe Cross
- DIN 1.4462 Reducing Cross
- Duplex Steel ASTM A815 Pipe Bend Exporter
- UNS S31803 U Bend
- B16.9 Duplex Steel Grade S32205 Piggable Bend
- DIN 1.4462 Long Radius Bend
- Duplex Steel 2205 Buttweld Bend
CHEMICAL COMPOSITION OF DUPLEX STEEL SEAMLESS AND WELDED PIPE FITTINGS
| Grade | Common Name | C% | Mn% | Si% | P% | S% | Cr% | Ni% | Mo% | N% |
|---|---|---|---|---|---|---|---|---|---|---|
| 2205 | S31803 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 21.0-23.0 | 4.5-6.5 | 2.5-3.5 | 0.08-0.20 |
| 2205 | S32205 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 22.0-23.0 | 4.5-6.5 | 3.0-3.5 | 0.14-0.20 |
MECHANICAL PROPERTIES OF ASME SA815 DUPLEX STEEL BUTTWELD PIPE FITTINGS
| Tensile Strength, ksi | 0.2% Yield Strength, ksi | Elongation, % | Hardness [HRC] |
|---|---|---|---|
| 90 min | 65 min | 25 min | 293 max |
SPECIFICATION OF DUPLEX STEEL BUTTWELL FITTINGS
| Specifications | ASTM A815 / ASME SA815 |
|---|---|
| Dimensions | ASME/ANSI B16.9, ASME B16.28, MSS-SP-43, BS4504, BS4504, BS1560, BS10 ASME 16.11, MSS SP-79, 83, 95, 97, BS 3799 |
| Size | Seamless Butt Weld Fittings: ½” to 10″ | Welded Butt Weld Fittings: ½” to 48″ |
| Schedule | SCH10, SCH20, SCH30, STD SCH40, SCH60, XS, SCH 80, SCH 100, SCH 120, SCH 140, SCH 160, XXS available with NACE MR 01-75 |
| Bending Radius | R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom |
| Type | Seamless / ERW / Welded / Fabricated |
| Thickness | 20 Swg., 18 Swg., 16 Swg., 14 Swg., 12 Swg., 10 Swg., & Sch. 10, Sch. 40, Sch. 80 etc. |
S31803/S32205 Duplex Steel ASTM A815 Buttweld Fittings Equivalent Grades
| Common Name | UNS | WNR. |
|---|---|---|
| Duplex Steel 2205 | S31803 / S32205 | 1.4462 |
PHYSICAL PROPERTIES OF DUPLEX STEEL S31803 & S32205 BUTTWELD FITTINGS
| Temperature | Density lbm/in³ | Electrical Resistivity mΩ·in | Thermal Conductivity (BTU/hr·ft·°F) | Heat Capacity BTU/lbm·°F | Electrical Resistivity (in × 10⁻⁶) |
|---|---|---|---|---|---|
| at 68°F | 0.278 | 27.6 | 8.7 | 0.112 | 33.5 |
| at 212°F | – | 26.1 | 9.2 | 0.119 | 35.4 |
| at 392°F | – | 25.4 | 9.8 | 0.127 | 37.4 |
| at 572°F | – | 24.9 | 10.4 | 0.134 | 39.4 |
💡 Practical Difference in Use
Use Duplex Steel S31803/S32205 Buttweld Pipe Fittings when: superior mechanical strength, excellent corrosion resistance, and high reliability under chloride-rich, corrosive, or high-pressure environments are required. These duplex stainless steels are engineered to prevent pitting, crevice, and stress corrosion cracking, ensuring safe and long-lasting welded connections. → Example: chemical processing pipelines, oil & gas transport lines, seawater systems, desalination plants, heat exchangers, and industrial process pipelines.
Applications of Duplex Steel S31803/S32205 Buttweld Pipe Fittings
Duplex Steel Buttweld Pipe Fittings are designed to deliver outstanding corrosion resistance, high mechanical strength, and dependable performance in aggressive chemical, thermal, and high-pressure industrial environments.
- Chemical & Petrochemical: Process piping, reactors, acid and alkali transfer lines, and solvent handling systems.
- Oil & Gas & Seawater Systems: Offshore pipelines, cooling water systems, desalination units, and marine applications.
- Power & Industrial Systems: Heat exchangers, high-pressure pipelines, and industrial process equipment.
When to Choose Duplex Steel S31803/S32205?
This duplex stainless steel grade is ideal for applications requiring high strength, resistance to chloride-induced stress corrosion cracking, and reliable welded performance under high pressure and chemically aggressive environments.
Choose Duplex Steel S31803/S32205 when:
- Piping or equipment operates in chloride-rich, corrosive, or marine environments
- High mechanical strength is needed without compromising corrosion resistance
- Welded joints must remain robust under chemical and thermal stress
- Long-term reliability is critical in high-pressure, high-temperature, or chemically aggressive conditions
- Used in chemical processing, oil & gas, desalination, or industrial process systems
Industries That Use Duplex Steel S31803/S32205 Buttweld Pipe Fittings
Duplex stainless steel fittings are widely adopted where maximum corrosion resistance, mechanical strength, and durable welded performance are essential.
Engineered for continuous service in highly corrosive chemical and high-pressure environments.
Uses
Process piping, reactors, acid and alkali transfer lines, and solvent handling systems.
Why Duplex Steel?
Offers exceptional resistance to pitting, crevice, and stress corrosion, combined with high strength for reliable chemical plant operations.
Trusted for durability, corrosion resistance, and high mechanical performance in marine, offshore, and seawater environments.
Uses
Offshore pipelines, seawater cooling systems, desalination plant piping, and marine applications.
Why Duplex Steel?
High resistance to chloride stress corrosion cracking ensures long-term reliability in harsh marine and oil & gas environments.
Used in critical applications requiring chemical, thermal, and mechanical stability.
Uses
Heat exchangers, high-pressure pipelines, and industrial process equipment.
Why Duplex Steel?
Combines superior mechanical strength with excellent corrosion resistance for durable and reliable performance under high pressure, temperature, and aggressive chemical conditions.
Usage Guide for Duplex Steel S31803/S32205 Buttweld Pipe Fittings
Smooth directional change in high-strength, corrosion-resistant welded piping systems.
Choose Elbow when
- 45°, 90°, or 180° directional change is required
- Piping operates in chloride-rich, corrosive, or high-pressure environments
- Welded joints must resist pitting, crevice, and stress corrosion cracking
- Used in chemical plants, oil & gas pipelines, or seawater systems
Creates reliable branch connections in chemically and mechanically demanding pipelines.
Choose Tee when
- Equal or reducing branch connections are required
- Piping is exposed to aggressive chemicals, seawater, or high pressure
- Long-term weld and corrosion stability is critical
- Used in chemical processing, offshore, or desalination systems
Maintains pipe alignment while reducing diameter in high-strength pipelines.
Choose Eccentric Reducer when
- Air or vapor pocket prevention is critical
- Used in pump suction lines or horizontal chemical piping
- Thermal expansion and mechanical stress must be managed
- High corrosion resistance and weld integrity are required
Uniform diameter transition for corrosion- and pressure-resistant piping systems.
Choose Concentric Reducer when
- Centered alignment is required
- Vertical or high-pressure pipelines are installed
- Smooth flow transition is necessary
- Used in heat exchangers, reactors, or desalination piping
Facilitates easy dismantling with lap joint flanges in high-strength service lines.
Choose Long Stub End when
- Frequent inspection or maintenance is required
- High corrosion and stress resistance at flange joints is needed
- Cost-effective solutions for large-diameter piping are preferred
- Used in chemical plants, desalination, or offshore pipelines
Compact lap joint connection for space-restricted high-pressure or corrosive pipelines.
Choose Short Stub End when
- Space constraints exist
- Economical lap joint flange connections are required
- Used in chemical process lines, heat exchangers, or seawater systems
- Resistance to pitting, crevice, and stress corrosion is essential
Seals pipe ends securely in high-strength, corrosive service environments.
Choose Pipe Cap when
- Pipe ends must be permanently or temporarily closed
- Used for pressure testing or future line expansion
- Leak-proof sealing under high pressure, temperature, or chemically aggressive conditions
- Exposed to chlorides, acids, or thermal cycling environments
Four-way branching for complex chemical, offshore, or seawater piping networks.
Choose Cross when
- Flow must be divided into multiple directions
- Used in chemical processing, desalination, or offshore pipelines
- Strong, corrosion-resistant welded joints are required
- Resistance to pitting, crevice, and stress corrosion is critical
Large-radius directional change for smooth flow and low pressure drop in high-strength pipelines.
Choose Pipe Bend when
- Gradual change in flow direction is required
- Used in chemical reactors, heat exchangers, desalination, or seawater pipelines
- Low turbulence and reduced pressure drop are important
- Long-term corrosion resistance and weld integrity are required
Our Buttweld Pipe Fittings are manufactured using advanced processes and undergo extensive quality checks to ensure flawless weldability, durability, and long service life. Each fitting is thoroughly inspected using key NDT techniques such as radiographic testing (RT), ultrasonic testing (UT), hydrostatic testing, and visual/dimensional examination. We also perform detailed chemical composition analysis and mechanical property testing to ensure material compliance with strict industry standards.
Throughout the forming and welding stages, every buttweld fitting is monitored closely to eliminate defects such as misalignment, surface irregularities, and wall-thickness variations. This ensures perfect joint integrity and high-performance reliability in pipelines carrying high temperatures, pressures, and corrosive media. All our buttweld fittings fully comply with ASME, ASTM, MSS-SP, and related global specifications, making them a preferred choice for critical piping systems worldwide.
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