ASME B16.9 Duplex & Super Duplex Buttweld Fittings in UNS S31803, S32205 & S32750 Grades
ASME SA815 Duplex Steel S31803 Buttweld Fittings, Duplex S32205 90° Elbows, UNS S31803 Concentric Reducers, Duplex Steel 2205 Long Radius Elbows, UNS S32205 Welded Pipe Fittings, Duplex S31803 Buttweld Crosses, Duplex Steel S32205 Eccentric Reducers, ASTM A815 Duplex 2205 Equal & Reducing Tees, Duplex S31803 Stub Ends, S32205 Buttweld Pipe Bends, Duplex Steel 2205 Pipe Caps, Duplex S31803/S32205 Buttweld Pipe Fittings Manufacturer, Supplier & Exporter in India.
ARK Stainless Inc is a trusted manufacturer, supplier and exporter of Duplex and Super Duplex Buttweld Fittings for high-pressure and corrosion-resistant piping systems used in offshore, marine, desalination, chemical processing, and oil & gas applications.
Our manufacturing range includes Duplex UNS S31803, S32205 and Super Duplex UNS S32750, S32760 Buttweld Elbows, Tees, Reducers, Caps, Stub Ends, and custom pipe fittings in seamless, welded, and fabricated construction.
Duplex Stainless Steel S31803 / S32205 has a mixed austenitic-ferritic structure and is known for its combination of mechanical strength and corrosion resistance. These grades offer good resistance to pitting, crevice corrosion and stress corrosion cracking, making Duplex 2205 Buttweld Fittings suitable for piping systems exposed to chlorides, seawater and other corrosive process conditions.
Duplex S32205 is commonly specified as the more tightly controlled version of the 2205 composition, while S31803 is also widely found in existing piping specifications and project requirements. S31803/S32205 Pipe Fittings are regularly used in offshore platforms, seawater piping, desalination plants, chemical processing equipment, pulp and paper plants and oil & gas installations.
These fittings are manufactured according to ASTM A815 / ASME SA815, ASME B16.9, ASME B16.28, and MSS SP-43 standards for industrial process piping systems requiring higher mechanical strength and improved resistance against pitting, crevice corrosion, and chloride exposure.
Duplex and Super Duplex Stainless Steel Buttweld Fittings are widely supplied for offshore platforms, seawater piping systems, refineries, chemical plants, heat exchangers, and process industries operating in corrosive environments.
ARK Stainless Inc. supplies ASTM A815 / ASME SA815 Duplex S31803/S32205 Buttweld Fittings in standard and custom sizes according to piping specifications, drawings and project requirements. Material Test Certificates, PMI, inspection reports and material traceability can also be supplied when specified.
Available in multiple schedules, wall thicknesses, and custom project requirements with inspection and material test certificate support.
ASTM A815 Duplex Steel S31803 Buttweld Pipe Elbows, Duplex S32205 Stub Ends, SAF 2205 Long Radius Elbows, Duplex Steel S31803 Eccentric Reducers, DIN 1.4462 Buttweld Fittings, Duplex S32205 Buttweld Tees, Duplex 2205 Pipe Bends, ANSI B16.9 Duplex Steel Reducers, Duplex S31803/S32205 Buttweld Fittings Manufacturer, Supplier & Exporter in Mumbai, India.
Testing, Inspection & Packing of Duplex S31803 / S32205 Pipe Fittings
Duplex S31803 and S32205 Pipe Fittings undergo inspection and testing before dispatch according to the applicable material specification and customer requirements. Testing can include Positive Material Identification (PMI), hardness testing, ultrasonic testing, hydrostatic testing, chemical and mechanical analysis, and visual and dimensional inspection, wherever applicable.
Once the required inspections are complete, Duplex S31803/S32205 buttweld fittings are prepared for dispatch with proper protection for weld bevels and finished surfaces. Smaller fittings can be packed in boxes or wooden cases, while larger sizes and bulk quantities are secured on pallets or in suitable export packing. Product markings and identification are kept visible for material traceability.
Available Types of Duplex S31803 / S32205 Buttweld Pipe Fittings
- ASTM A815 Duplex S31803 Short Radius Elbows
- Duplex S32205 45° Buttweld Elbows
- SAF 2205 90° Long Radius Elbows
- ASME B16.9 Duplex 2205 3D & 5D Pipe Bends
- Duplex S31803 Concentric Reducers
- Duplex S32205 Eccentric Reducers
- ASTM A815 Duplex 2205 Equal Tees
- Duplex S31803 Reducing Tees
- Duplex Steel S32205 Buttweld Crosses
- ASME SA815 Duplex Steel Buttweld End Caps
- UNS S31803 Duplex Steel Stub Ends
- DIN 1.4462 Duplex Steel Buttweld Fittings
- ASTM A815 Duplex S32205 Buttweld Pipe Fittings
- Duplex 2205 Heavy Wall Buttweld Fittings
- Duplex S31803 / S32205 Buttweld Pipe Bends
- Duplex 2205 Custom Buttweld Fittings
Chemical Composition of Duplex & Super Duplex Steel Seamless and Welded Pipe Fittings
| Grade |
Common Name |
C% |
Mn% |
Si% |
P% |
S% |
Cr% |
Ni% |
Mo% |
N% |
Others |
| 2205 |
S31803 |
0.030 |
2.00 |
1.00 |
0.030 |
0.020 |
21.0–23.0 |
4.5–6.5 |
2.5–3.5 |
0.08–0.20 |
- |
| S32205 |
0.030 |
2.00 |
1.00 |
0.030 |
0.020 |
22.0–23.0 |
4.5–6.5 |
3.0–3.5 |
0.14–0.20 |
- |
| Super Duplex |
S32750 / S32760 |
0.020 |
- |
- |
- |
0.001 |
25 |
7 |
4.0 |
0.27 |
- |
Mechanical Properties of SS Seamless and Welded Buttweld Fittings
| Property |
Duplex Steel (S31803/S32205) |
Super Duplex Steel (S32750/S32760) |
| Tensile Strength |
90 ksi min |
116 ksi min |
| Yield Strength (0.2% Offset) |
65 ksi min |
80 ksi min |
| Yield Strength (0.1% Offset) |
- |
91 ksi min |
| Elongation (%) |
25% min |
15% min |
| Hardness |
HRC 293 max |
Rockwell C 32 max |
| Impact Energy |
- |
74 ft.-lbs. min |
Duplex Steel S31803 / S32205 Buttweld Fittings
ASTM A815 Duplex Steel Buttweld Fittings, Duplex 2205 Pipe Fittings, Werkstoff 1.4462 Duplex Buttweld Fittings, ANSI B16.9 Duplex S31803 Pipe Fittings, Duplex S32205 Welded Pipe Fittings, ASME SA815 Duplex 2205 Buttweld Fittings, MSS SP-43 Duplex Steel Fittings, UNS S31803 Buttweld Elbows & Tees, S32205 Duplex Reducers & Stub Ends, Duplex S31803/S32205 Buttweld Pipe Fittings Manufacturer, Supplier & Exporter in Mumbai, India.
Duplex Steel S31803 and S32205 Buttweld Fittings are widely supplied for offshore piping, seawater systems, chemical processing plants, heat exchangers, oil & gas installations, desalination units, and industrial process piping applications requiring higher strength and corrosion resistance.
ARK Stainless Inc manufactures,supplies and exports Duplex Steel Buttweld Elbows, Tees, Reducers, Caps, and Stub Ends in seamless and welded construction according to ASTM A815 and ASME B16.9 standards.
These fittings are commonly used in chloride-rich environments where resistance against pitting, crevice corrosion, and stress corrosion cracking is required.
All Duplex Steel Buttweld Fittings are supplied with material test certificates and inspection support as per project requirements. Testing includes PMI testing, hardness testing, chemical analysis, mechanical testing, flattening tests, IGC testing, and radiographic inspection.
Wrought Ferritic-Austenitic Duplex Steel Pipe Fittings, ASTM A815 Duplex 2205 Buttweld Fittings, Duplex UNS S31803 Buttweld Pipe Fittings, Duplex S32205 Equal & Reducing Tees, ASME SA815 Duplex 2205 Stub Ends, Duplex UNS S32205 Pipe Elbows, Duplex S31803 Concentric Reducers, Duplex S32205 Pipe Caps, DIN 1.4462 Duplex Steel Buttweld Fittings, Duplex 2205 Buttweld Fittings Manufacturer, Supplier & Exporter in India.
Advantages of Duplex S31803 / S32205 Buttweld Fittings
Duplex S31803 and S32205 Buttweld Fittings combine higher mechanical strength with good corrosion resistance, making them suitable for demanding process piping systems. Their resistance to chloride-induced stress corrosion cracking, pitting and crevice corrosion is particularly useful in seawater, marine, chemical processing and offshore applications.
The higher strength of Duplex 2205 can also be useful for piping systems operating under demanding pressure and mechanical conditions. The material offers good fatigue resistance and retains useful toughness at lower temperatures, depending on the applicable design and material requirements.
For projects exposed to chlorides and other corrosive process media, Duplex 2205 pipe fittings can provide a practical alternative where conventional austenitic stainless steel may not offer the required combination of strength and corrosion resistance.
Duplex Steel S32205 Buttweld Pipe Fittings, ASTM A815 Duplex 2205 Pipe Fittings, UNS S32205 Buttweld Fittings, Duplex 2205 Long Radius Elbows, ANSI B16.9 Duplex Steel Reducers, S32205 Duplex Buttweld Tees, Duplex 2205 Pipe Caps, UNS S32205 Stub Ends, Duplex Steel 2205 Buttweld Fittings Manufacturer, Supplier & Exporter in India.
Duplex 2205 Buttweld Fittings Range
ARK Stainless Inc. supplies ASTM A815 Duplex S31803/S32205 Buttweld Fittings in a range of configurations for new piping projects, maintenance requirements and replacement jobs. The range includes Duplex 2205 elbows, equal and reducing tees, concentric and eccentric reducers, crosses, end caps, stub ends and pipe bends in different sizes and schedules.
Fittings can be supplied against UNS S31803, UNS S32205 and DIN/EN 1.4462 material requirements, depending on the project specification.
Applications of Duplex S31803 / S32205 Buttweld Fittings
Duplex S31803/S32205 Buttweld Pipe Fittings are used in industrial piping systems where strength and resistance to corrosive service conditions are required. Common applications include:
- Duplex S32205 Buttweld Fittings for Offshore & Marine Piping
- ASTM A815 Duplex 2205 Pipe Fittings for Oil & Gas Projects
- Duplex S31803 Buttweld Fittings for Chemical Processing Plants
- UNS S32205 Pipe Fittings for Seawater Piping Systems
- Duplex 2205 Buttweld Pipe Fittings for Desalination Plants
- ASTM A815 S31803 Pipe Fittings for Pulp & Paper Plants
- Duplex S32205 Buttweld Fittings for Petrochemical Process Lines
- ASME SA815 Duplex Pipe Fittings for Power Plant Piping
- Duplex S31803 / S32205 Fittings for Heat Exchanger Piping
- Duplex Steel 2205 Pipe Fittings for Water Treatment Plants
- UNS S31803 Buttweld Fittings for Industrial Process Piping
- Duplex S32205 Pipe Fittings for Chemical Transfer Lines
Wrought Ferritic / Austenitic Duplex Buttweld Fittings – Available Types
Duplex S31803/S32205 Buttweld Pipe Fittings are used in industrial piping systems where strength and resistance to corrosive service conditions are required. Common applications include:
- Duplex S31803 Buttweld Fittings
- Duplex S32205 / 2205 Buttweld Fittings
- ASTM A815 Duplex S31803 Pipe Elbows
- Duplex S32205 90° Long Radius Elbows
- Duplex S31803 45° Buttweld Elbows
- SAF 2205 Short Radius Elbows
- UNS S31803 Concentric Reducers
- Duplex S31803 Equal Tees
- Duplex S31803 Buttweld Crosses
- Duplex S31803 Stub Ends
- ASME SA815 Duplex Pipe Caps
- DIN 1.4462 Buttweld Pipe Fittings
- Duplex S31803 3D Pipe Bends
- ASTM A815 S31803 Buttweld Fittings
- Duplex S31803 Heavy Wall Fittings
- UNS S31803 Welded Pipe Fittings
- Duplex S32205 Eccentric Reducers
- ASTM A815 Duplex 2205 Reducing Tees
- UNS S32205 Buttweld Crosses
- Duplex Steel 2205 Lap Joint Stub Ends
- Duplex S32205 Buttweld End Caps
- ANSI B16.9 Duplex 2205 Buttweld Fittings
- Duplex S32205 5D Pipe Bends
- ASME SA815 S32205 Buttweld Pipe Fittings
- Duplex 2205 Custom Buttweld Fittings
- UNS S32205 Welded Pipe Fittings
S31803/S32205 Duplex Steel ASTM A815 Buttweld Fittings Equivalent Grades
| STANDARD |
UNS |
WNR. |
| Duplex Steel 2205 |
S31803 / S32205 |
1.4462 |
Specification of Duplex Steel Buttweld Fittings
- Specifications: ASTM A815 / ASME SA815
- Dimensions: ASME/ANSI B16.9, ASME B16.28, MSS-SP-43, BS4504, BS1560, BS10, ASME 16.11, MSS SP-79, 83, 95, 97, BS 3799
- Size: Seamless Butt Weld Fittings: 1/2" - 10" | Welded Butt Weld Fittings: 1/2" - 48"
- Schedule: SCH10, SCH20, SCH30, STD, SCH40, SCH60, XS, SCH80, SCH100, SCH120, SCH140, SCH160, 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.
Super Duplex S32750 / S32760 Buttweld Fittings
ASTM A815 Super Duplex S32750 Buttweld Pipe Fittings, Super Duplex 2507 Pipe Fittings, Werkstoff 1.4410 Buttweld Fittings, ANSI B16.9 Super Duplex 2507 Elbows & Tees, UNS S32750 Concentric & Eccentric Reducers, ASME SA815 Super Duplex Buttweld Fittings, MSS SP-43 Super Duplex Stub Ends, Super Duplex S32750 Pipe Caps & Crosses, Super Duplex 2507 Buttweld Fittings Manufacturer, Supplier & Exporter in Mumbai, India.
Super Duplex S32750 and S32760 Buttweld Fittings are widely used in offshore piping systems, seawater applications, chemical processing plants, desalination units, oil & gas installations, and high-pressure industrial process piping systems requiring higher mechanical strength and corrosion resistance.
ARK Stainless Inc manufactures, supplies and exports Super Duplex Buttweld Elbows, Tees, Reducers, Caps, and Stub Ends in seamless and welded construction according to ASTM A815 and ASME B16.9 standards.
These fittings are commonly selected for chloride-rich and corrosive environments where improved resistance against pitting, crevice corrosion, and stress corrosion cracking is required.
All Super Duplex Steel Buttweld Fittings are supplied with material test certificates, PMI testing, hardness testing, chemical analysis, flattening tests, and third-party inspection support as per project requirements.
Super Duplex S32760 Buttweld Pipe Fittings, ASTM A815 Super Duplex S32750 Pipe Fittings, 2507 Super Duplex 45° & 90° Elbows, UNS S32760 Buttweld Tees & Crosses, Super Duplex S32750 Eccentric Reducers, ANSI B16.9 Super Duplex Concentric Reducers, UNS S32750 Stub Ends, Super Duplex 2507 Pipe Bends & End Caps, Super Duplex S32750/S32760 Buttweld Fittings Manufacturer, Supplier & Exporter in India.
What are Super Duplex S32750 Buttweld Fittings?
Super Duplex S32750 Buttweld Fittings are used to connect, branch, reduce or change the direction of pipelines operating in demanding and corrosive environments. Manufactured from Super Duplex UNS S32750, these fittings combine high mechanical strength with good corrosion resistance and are commonly specified for oil & gas, offshore, marine, chemical and petrochemical piping systems.
The range includes Super Duplex S32750 elbows, tees, reducers, crosses, end caps, stub ends and pipe bends for different piping configurations and project requirements.
What is the Difference Between Super Duplex S32750 and S32760 Buttweld Fittings?
Super Duplex S32750 and S32760 Buttweld Fittings are both used for demanding corrosion-resistant piping applications, but their chemical compositions differ. S32760 includes tungsten in addition to chromium, nickel, molybdenum and nitrogen, which distinguishes it from S32750 and can provide advantages in certain aggressive service environments.
What are the Advantages of Super Duplex S32750 Buttweld Fittings?
Super Duplex S32750 Buttweld Pipe Fittings offer a combination of high mechanical strength and resistance to aggressive corrosion. Their properties make them particularly useful for piping exposed to seawater, chlorides and demanding process media.
- High resistance to pitting and crevice corrosion
- Good resistance to chloride stress corrosion cracking
- High mechanical and yield strength
- Suitable for demanding offshore and marine environments
- Good performance in corrosive process piping
- Suitable for oil & gas and chemical processing applications
- Good weldability when correct welding procedures are followed
- Long service life under appropriate operating conditions
S32750/S32760 Super Duplex Steel ASTM A815 Buttweld Fittings Equivalent Grades
| STANDARD |
UNS |
WNR. |
| Super Duplex Steel 2507 |
S32760 / S32750 |
1.4410 |
Specification of Super Duplex Steel Buttweld 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: 1/2" - 10" | Welded Butt Weld Fittings: 1/2" - 48"
- Schedule: SCH10, SCH20, SCH30, STD, SCH40, SCH60, XS, SCH80, SCH100, SCH120, SCH140, SCH160, 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.
ASTM A815 Super Duplex Steel Buttweld Pipe Fittings
- Super Duplex Elbows & Bends
- ASTM A815 Super Duplex 90° Long Radius
- Super Duplex S32750 Short Radius Elbow
- ASTM A815 Super Duplex 45° Elbow
- Super Duplex 2507 90° Buttweld Elbow
- Super Duplex S32750 3D Pipe Bend
- Super Duplex S32760 5D Pipe Bend
- Super Duplex S32750 Reducing Elbow
- ASME SA815 Super Duplex LR Elbow
- Werkstoff 1.4410 Buttweld Pipe Elbow
- Super Duplex 2507 Custom Pipe Bends
- Super Duplex Tees, Reducers & Other Fittings
- ASTM A815 Super Duplex Equal Tee
- Super Duplex S32760 Reducing Tee
- UNS S32750 Concentric Reducer
- UNS S32760 Eccentric Reducer
- ASTM A815 Super Duplex Buttweld Cross
- Super Duplex 2507 Reducing Cross
- ASTM A815 Super Duplex End Cap
- Super Duplex S32750 / S32760 Stub Ends
- ANSI B16.9 Super Duplex Buttweld Fittings
- ASTM A815 S32750 / S32760 Buttweld Fittings
Available Types of Super Duplex S32750 / S32760 Buttweld Pipe Fittings
- Super Duplex S32750 Buttweld Fittings
- UNS S32750 90° Buttweld Pipe Elbow
- ASTM A815 S32750 Long Radius Elbow
- Super Duplex S32750 Concentric Reducer
- Super Duplex S32750 Reducing Tee
- Werkstoff 1.4410 Super Duplex Pipe Tee
- UNS S32750 Buttweld Stub Ends
- ASTM A815 S32750 Reducing Cross
- ANSI B16.9 Super Duplex Buttweld Fittings
- Super Duplex S32750 3D Pipe Bends
- ASTM A815 S32750 Welded Pipe Fittings
- Super Duplex S32750 Heavy Wall Fittings
- UNS S32750 Buttweld Pipe Caps
- Super Duplex S32760 / 2507 Buttweld Fittings
- Super Duplex S32760 45° Buttweld Elbow
- Super Duplex 2507 Short Radius Elbow
- UNS S32760 Eccentric Reducer
- ASTM A815 S32760 Equal Tee
- Super Duplex 2507 Buttweld Cross
- Super Duplex S32760 Pipe End Caps
- Super Duplex 2507 Reducing Elbow
- ASME SA815 S32760 Buttweld Fittings
- Super Duplex S32760 5D Pipe Bends
- ASME SA815 Super Duplex 2507 Pipe Fittings
- Super Duplex 2507 Custom Buttweld Fittings
- UNS S32760 Buttweld Stub Ends
Applications of Super Duplex S32750 / S32760 Buttweld Fittings
ASTM A815 Super Duplex S32750 / S32760 Buttweld Pipe Fittings are supplied for demanding piping systems where high strength and corrosion resistance are required. Common applications include:
- Super Duplex S32750 Buttweld Fittings for Offshore Oil & Gas Platforms
- Super Duplex S32760 Pipe Fittings for Seawater Piping Systems
- ASTM A815 Super Duplex 2507 Fittings for Chemical Processing Plants
- Super Duplex S32750 Buttweld Pipe Fittings for Desalination Plants
- UNS S32760 Buttweld Fittings for Marine Piping Systems
- Super Duplex 2507 Pipe Fittings for Petrochemical Process Lines
- ASTM A815 S32750 Pipe Fittings for Heat Exchanger Piping
- Super Duplex S32760 Buttweld Fittings for Water Treatment Plants
- ASME SA815 Super Duplex Pipe Fittings for Oil & Gas Process Piping
- Super Duplex 2507 Buttweld Fittings for Pulp & Paper Plants
- UNS S32750 Pipe Fittings for Chemical Transfer Lines
- Super Duplex S32750 / S32760 Fittings for High-Pressure Process Piping
