ARK Stainless Inc. is a manufacturer, supplier and exporter of Duplex and Super Duplex Steel Forged Fittings in India. We manufacture socket-weld and threaded forged fittings for piping systems operating in offshore, marine, chemical processing and high-pressure service environments.
Duplex and Super Duplex stainless steels are selected for applications where both mechanical strength and corrosion resistance are important. Their dual-phase microstructure combines the characteristics of austenitic and ferritic stainless steel, providing higher strength than conventional stainless steel grades along with improved resistance to pitting, crevice corrosion and stress corrosion cracking.
We manufacture forged fittings in Duplex grades UNS S31803 and UNS S32205, as well as Super Duplex grades UNS S32750 and UNS S32760. These materials are widely used in seawater systems, desalination plants, offshore platforms, oil and gas installations, chemical processing facilities and other applications exposed to chloride-bearing fluids and corrosive process media.
Our range includes forged elbows, tees, couplings, unions, caps, plugs, bushings, crosses, adapters, pipe nipples and swage nipples manufactured in accordance with ASTM A182, ASME B16.11, MSS SP-79, MSS SP-83, MSS SP-95, MSS SP-97 and BS 3799 standards. Socket weld and threaded forged fittings are available in pressure classes 2000#, 3000#, 6000# and 9000# according to project requirements.
The higher strength of Duplex and Super Duplex stainless steel can help reduce wall thickness requirements in certain piping systems while maintaining pressure-handling capability. These materials are also widely used where resistance to chloride attack and stress corrosion cracking is a key consideration during material selection.
Duplex Steel UNS S31803 Forged Fittings combine good mechanical strength with resistance to pitting and crevice corrosion in chloride-containing environments. These forged fittings are commonly used in offshore piping, chemical processing equipment, seawater systems and industrial process lines where both strength and corrosion resistance are required.
Duplex Steel UNS S32205 Forged Fittings are widely used in oil and gas facilities, desalination plants, marine systems and chemical processing units. The grade offers higher strength than conventional austenitic stainless steels while maintaining good resistance to stress corrosion cracking and chloride attack in demanding service conditions.
Super Duplex Steel UNS S32750 Forged Fittings are used in aggressive service environments involving seawater, chlorides and corrosive process fluids. The higher chromium, molybdenum and nitrogen content improves resistance to pitting and crevice corrosion, making S32750 forged fittings suitable for offshore platforms, subsea systems and desalination projects.
Super Duplex Steel UNS S32760 Forged Fittings are commonly installed in offshore oil and gas facilities, marine piping systems and chemical processing plants operating under severe corrosive conditions. The grade combines high strength with resistance to chloride-induced corrosion and stress corrosion cracking in demanding process environments.
The main difference between Duplex and Super Duplex Steel Forged Fittings is the alloy composition and corrosion resistance level. Super Duplex grades contain higher levels of chromium, molybdenum and nitrogen, resulting in greater resistance to pitting, crevice corrosion and chloride attack. Duplex grades are widely used in general offshore and chemical processing applications, while Super Duplex grades are often selected for more aggressive service conditions involving seawater and highly corrosive process fluids.
Duplex and Super Duplex Steel Forged Fittings are used in offshore platforms, subsea pipelines, desalination plants, chemical processing facilities, oil and gas projects, marine systems, power generation units and seawater handling installations. These materials are frequently selected for piping systems exposed to chloride-bearing fluids, high pressures and corrosive operating environments.
Our range includes forged elbows, tees, couplings, unions, caps, plugs, bushings, crosses, adapters, pipe nipples and swage nipples. Available in threaded and socket weld types, these fittings are used throughout process piping systems to connect, divert, reduce or terminate the flow of fluids under pressure.
Duplex and Super Duplex forged fittings offer higher yield strength than conventional stainless steel grades while maintaining good toughness and corrosion resistance. The dual-phase microstructure contributes to their pressure-handling capability and resistance to stress corrosion cracking in chloride-rich environments.
We manufacture Duplex and Super Duplex forged fittings in accordance with ASTM A182 and ASME SA182 specifications. Dimensional standards include ASME B16.11, MSS SP-79, MSS SP-83, MSS SP-95, MSS SP-97 and BS 3799. Available grades include UNS S31803, UNS S32205, UNS S32750 and UNS S32760.
Duplex and Super Duplex forged fittings are manufactured in pressure classes 2000#, 3000#, 6000# and 9000# in accordance with ASME B16.11 requirements. Threaded fittings are typically supplied in class 2000#, 3000# and 6000#, while socket-weld fittings are available in class 3000#, 6000# and 9000#. The required pressure class is determined by the operating conditions of the system, including pressure, temperature and the severity of the service environment.
Duplex and Super Duplex forged fittings are available in both socket weld and threaded designs for offshore, marine and process piping applications. Socket weld fittings are generally selected for permanently welded systems, while threaded fittings are frequently used in smaller pipe sizes where inspection, dismantling or replacement may be required during service. NPT, BSP and BSPT thread forms are available to suit different piping standards and project requirements.
Duplex Steel Forged Fittings are known for their robust construction, high tensile strength, and low maintenance needs, ensuring long-term durability and reduced downtime. The increased corrosion resistance compared to carbon steel and stainless steel allows for a more reliable and efficient system, with lighter construction and fewer welding requirements, ultimately contributing to a more compact and cost-effective design.
| 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 | - |
| Property | Duplex Steel S31803 / S32205 | Super Duplex Steel S32750 / S32760 |
|---|---|---|
| Tensile Strength | 620 MPa min | 116 ksi (800 MPa) min |
| Yield Strength | 450 MPa min | 80 ksi (550 MPa) min (0.2% offset) |
| Yield Strength (0.1% Offset) | - | 91 ksi (625 MPa) min |
| Elongation | - | 15% min in 2 inches |
| Hardness (Rockwell C) | - | 32 max |
| Impact Energy | - | 74 ft.-lbs. min |
| Density | 7,805 kg/m³ | - |
| Elastic Modulus | 200 GPa | - |
Duplex Steel S31803 / S32205 Forged Fittings are used in piping systems where both strength and corrosion resistance are important. Manufactured from Duplex 2205 stainless steel, these fittings offer good resistance to pitting, crevice corrosion, and stress corrosion cracking, making them suitable for use in chemical processing, offshore, marine, oil & gas, and other demanding industrial environments. The duplex microstructure provides higher strength than conventional stainless steel grades while maintaining good corrosion resistance in challenging operating conditions.
As a manufacturer and supplier of Duplex Steel Forged Fittings, we offer a comprehensive range of socket weld and threaded fittings for oil & gas, petrochemical, chemical processing, offshore, marine, desalination, power generation, and industrial piping applications. We manufacture these fittings in accordance with ASTM A182 and ASME standards and supply them in various sizes, pressure classes, and configurations to meet project requirements.
Duplex Stainless Steel S31803 and S32205 are among the most widely used duplex stainless steel grades. They offer a balanced microstructure consisting of approximately equal amounts of austenite and ferrite, resulting in higher mechanical strength and improved corrosion resistance compared to conventional stainless steel grades.
S32205 is the commonly specified grade within the Duplex 2205 family. Its higher chromium, molybdenum, and nitrogen content provides better corrosion resistance, particularly in chloride-containing and aggressive process environments.
We manufacture and supply a complete range of Duplex Steel S31803 / S32205 Forged Fittings, including:
We manufacture Duplex Steel S31803 / S32205 Forged Fittings in both socket-weld and threaded configurations for a wide range of industrial piping applications.
Duplex Steel Forged Fittings are used across a wide range of industrial sectors, including:
They are widely used in onshore and offshore piping systems exposed to corrosive fluids and challenging operating conditions.
Our Duplex Steel Forged Fittings are manufactured in accordance with internationally recognised standards:
S31803 and S32205 are both Duplex 2205 stainless steel grades and are used in similar industrial applications. S32205 contains slightly higher levels of chromium, molybdenum, and nitrogen, which help improve corrosion resistance in demanding environments. As a result, S32205 is commonly specified for applications involving seawater, chlorides, and aggressive process media.
Both grades offer high strength and good corrosion resistance, making them suitable for use in oil & gas, chemical processing, marine, offshore, and other industrial piping systems.
Duplex Steel S31803 / S32205 Forged Fittings are widely used in piping systems where high strength and corrosion resistance are required. Their ability to perform in chloride-containing and high-pressure environments makes them suitable for applications in oil & gas, chemical processing, offshore, marine, and power generation industries.
| STANDARD | WNR. |
|---|---|
| Duplex S31803 / S32205 | 1.4462 |
ARK Stainless Inc. is a manufacturer, supplier and exporter of Super Duplex S32750 and S32760 Forged Fittings in India. We manufacture socket-weld and threaded forged fittings for offshore, marine, desalination, chemical processing and high-pressure piping systems operating in corrosive service environments.
Super Duplex S32750 and S32760 stainless steels are widely used where high strength and corrosion resistance are required in the same piping system. These grades offer good resistance to pitting, crevice corrosion and stress corrosion cracking in chloride-containing environments, making them suitable for seawater handling systems, offshore platforms and process plants exposed to aggressive process media.
Our range includes forged elbows, tees, couplings, unions, caps, plugs, bushings, crosses, adapters and swage nipples manufactured in accordance with ASTM A182 and ASME B16.11 standards.
ASTM A182 F53 Super Duplex S32750 Forged Fittings are widely used in offshore platforms, subsea piping systems, desalination plants and chemical processing facilities exposed to chloride-bearing fluids. The combination of high chromium, molybdenum and nitrogen content provides strong resistance to pitting, crevice corrosion and stress corrosion cracking in aggressive service environments.
ASTM A182 F55 Super Duplex S32760 Forged Fittings are commonly used in seawater systems, marine installations, oil and gas facilities and process equipment operating under corrosive conditions. The alloy offers high mechanical strength along with resistance to chloride attack, making it suitable for demanding applications where conventional stainless steel grades may not provide sufficient performance.
The main difference between Super Duplex S32750 and S32760 forged fittings lies in their chemical composition. S32760 contains controlled additions of tungsten and copper, which can provide enhanced corrosion resistance in certain process environments. Both grades offer high strength and excellent resistance to pitting, crevice corrosion and stress corrosion cracking, making them suitable for offshore, marine and chemical processing applications.
Super Duplex S32750 and S32760 forged fittings are used in offshore platforms, subsea pipelines, desalination plants, marine systems, chemical processing facilities, oil and gas installations, seawater cooling systems and power generation projects. These fittings are often selected for piping systems handling seawater, brine solutions, chloride-bearing fluids and other corrosive process media.
Our range includes forged elbows, tees, couplings, unions, caps, plugs, bushings, crosses, adapters, pipe nipples and swage nipples. Available in threaded and socket weld designs, these fittings are used throughout process piping systems to connect, divert, reduce or terminate the flow of fluids under pressure.
Super Duplex S32750 and S32760 forged fittings offer high yield strength, good toughness and strong resistance to chloride-induced corrosion. The combination of mechanical strength and corrosion resistance makes these grades suitable for high-pressure piping systems operating in aggressive environments where conventional stainless steel grades may not be suitable.
We manufacture Super Duplex forged fittings in accordance with ASTM A182 and ASME SA182 specifications. Dimensional standards include ASME B16.11, MSS SP-79, MSS SP-83, MSS SP-95, MSS SP-97 and BS 3799. Available grades include UNS S32750 and UNS S32760.
We manufacture Super Duplex S32750 and S32760 forged fittings in Class 2000#, 3000#, 6000# and 9000# pressure ratings for offshore, marine and chemical processing applications. Threaded forged fittings are generally available in Class 2000#, 3000# and 6000#, while socket weld forged fittings are supplied in Class 3000#, 6000# and 9000#. Pressure class selection depends on the design pressure and operating conditions of the piping system.
Super Duplex S32750 and S32760 forged fittings are available in socket weld and threaded configurations for seawater systems, offshore installations and chemical process piping. Socket weld fittings are commonly used where a permanent welded connection is preferred, while threaded fittings are often chosen for smaller bore lines, instrument connections and piping systems that may require future access. NPT, BSP and BSPT thread forms are available to suit different piping standards and project requirements.
Super Duplex S32750 and S32760 forged fittings are used across offshore oil and gas facilities, desalination plants, chemical processing units, marine systems, seawater cooling installations, power generation projects and fertiliser plants. These industries often require piping materials capable of handling corrosive process fluids and chloride-rich operating environments.
Super Duplex S32750 and S32760 forged fittings are often selected for piping systems where standard stainless steel grades such as SS 304 and SS 316L may not provide the required combination of strength and corrosion resistance. The higher mechanical strength of Super Duplex stainless steel can support high-pressure service while maintaining good resistance to corrosion.
Super Duplex grades also offer better resistance to pitting and crevice corrosion in chloride-containing environments. As a result, these materials are frequently used in seawater systems, offshore platforms, desalination plants and chemical processing facilities handling corrosive process fluids.
Another advantage of Super Duplex stainless steel is its resistance to chloride-induced stress corrosion cracking, a factor that can influence material selection in marine environments and other applications exposed to chlorides. For this reason, Super Duplex forged fittings are widely used in offshore, marine and chemical processing industries.
| STANDARD | WNR. |
|---|---|
| Super Super Duplex S32750 / S32760 | 1.4410 |
| Element | UNS S32750 (%) | UNS S32760 (%) |
| Carbon (C) | 0.03 | 0.03 |
| Manganese (Mn) | 1.20 | 1.00 |
| Silicon (Si) | 0.8 | 1.0 |
| Chromium (Cr) | 24.0 - 26.0 | 24.0 - 26.0 |
| Nickel (Ni) | 6.0 - 8.0 | 6.0 - 8.0 |
| Molybdenum (Mo) | 3.0 - 5.0 | 3.0 - 4.0 |
| Nitrogen (N) | 0.24 - 0.32 | 0.20 - 0.30 |
| Copper (Cu) | - | 0.50 - 1.00 |
| Tungsten (W) | - | 0.50 - 1.00 |
| Sulphur (S) | 0.02 | 0.01 |
| Phosphorus (P) | 0.035 | 0.03 |
| Property | S32750 | S32760 |
| Tensile Strength | 800 MPa Min | 750 MPa Min |
| Yield Strength (0.2% Offset) | 550 MPa Min | 550 MPa Min |
| Elongation | 15% Min | 25% Min |
| Hardness | Max 310 HB | Max 300 HB |
| Impact Toughness | Good | Good |
| Density | 7.8 g/cm³ | 7.8 g/cm³ |
| Description | Specification |
| Material Specification | ASTM A182 / ASME SA182 |
| Dimension Standard | ASME B16.11, MSS SP-79, MSS SP-83, MSS SP-95, MSS SP-97, BS 3799 |
| Grades | UNS S32750, UNS S32760 |
| Size Range | 1/8" NB to 4" NB |
| Type | Socket Weld & Threaded |
| Thread Form | NPT, BSP, BSPT |
| Pressure Classes | 2000#, 3000#, 6000#, 9000# |
