Super Duplex UNS S32750 Pipe Fittings Supplier

Q: What is the distinction between S32750 and S32760 pipe fittings Super Duplex?

UNS S32750 and UNS S32760 are similar Super Duplex stainless steels with comparable duplex austenitic-ferritic microstructure and alloy composition. The main difference lies in the finer chemistry: S32760 contains slightly higher molybdenum and other alloying elements, increasing its PREN value and improving its resistance in severe chloride or sour environments. S32750 (Super Duplex 2507) provides excellent corrosion resistance and strength for most offshore, desalination and chemical applications. Designers may choose S32760 when a project requires higher corrosion margins or to match existing S32760 equipment.

Q: What are the more popular uses of Super Duplex UNS S32750 pipe fittings?

Super Duplex UNS S32750 pipe fittings are used where standard stainless steels do not provide the required strength and corrosion resistance. They are widely utilized in offshore and onshore oil and gas systems, injection and produced-water systems, seawater and firewater networks, and subsea manifolds. Beyond oil and gas, they are used in desalination plants, seawater handling systems, chemical and petrochemical industries, power plant cooling systems, and pulp and paper bleaching circuits. Their high resistance to pitting, crevice corrosion, and stress corrosion cracking makes them suitable for long-life installations with limited access for maintenance.

Q: What is the standard size and size of the Super Duplex 2507 butt weld fittings?

Super Duplex 2507 (UNS S32750) butt weld fittings are generally produced to ASTM A815 / ASME SA815 standards for wrought ferritic-austenitic stainless steel fittings. Dimensions follow ASME/ANSI B16.9 for factory-made buttweld fittings, ASME B16.28 for short-radius elbows/returns, and MSS SP-43 for light-wall fittings. Manufacturers typically supply nominal pipe sizes from 1/2" up to 24"–36" NB depending on fitting type. Wall thicknesses correspond to common pipe schedules such as Sch 10S, 40S, 80S, 160, and XXS. Fabricated elbows, tees, reducers, caps, and stub ends are produced to match the required pipe schedule and design specifications.

Q: How does the Super Duplex UNS S32750 fittings perform in the seawater and chloride condition?

Super Duplex UNS S32750 fittings are highly suitable for seawater and chloride-rich environments. With 24–26% chromium, high molybdenum and nitrogen content, and a duplex structure, they offer a very high PREN value, resulting in excellent pitting and crevice corrosion resistance even at elevated temperatures. S32750 also provides far better resistance to chloride-induced stress corrosion cracking than standard austenitic stainless steels. When combined with proper system design, welding, and commissioning practices, S32750 elbows, tees, and reducers ensure long, reliable service in offshore platforms, desalination systems, cooling water circuits, and other high-chloride applications.

Solitaire Overseas is a specialist manufacturer, stockist and exporter of Super Duplex UNS S32750 / 2507 and UNS S32760 pipe fittings which are used in critical piping systems in oil and gas, petrochemical, marine, power plants and desalination plants. Our high-alloy Super Duplex stainless steel with balanced austenitic-ferritic microstructure, which provides very high mechanical strength, good pitting and crevice corrosion resistance, and consistent stress corrosion cracking behavior, is used to make elbows, tees, reducers, caps, stub ends and special fittings, and other products. All Super Duplex UNS S32750 pipe fittings are made and tested in compliance with ASTM A815 / ASME SA815 and dimensions to ASME/ANSI B16.9, ASME B16.28 and MSS SP-43 are all completely compatible with international piping codes and project specifications.

Solitaire Overseas provides EPC contractors, fabricators and end users in India, the Middle East, Europe, Asia, Africa and the Americas with reliable Super Duplex steel pipe fittings, using material grades with a standard of Super Duplex UNS S32750 (2507) and UNS S32760 on request, a size range of between 1/2 in. NB to 36 in. NB, and butt weld, forged, threaded and socket weld options. To full packages, we also provide corresponding Super Duplex UNS S32750 / S32760 pipes and tubes and the entire range of Super Duplex UNS S32750 flanges in the same metallurgy so that a customer can source complete Super Duplex piping systems with one qualified supplier.

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Standard Specifications for Super Duplex Steel Pipe Fittings (UNS S32750 / S32760)
What are Super Duplex UNS S32750 / S32760 Pipe Fittings?
Types of Super Duplex UNS S32750 / S32760 Buttweld Pipe Fittings & Size Range
Super Duplex Steel UNS S32750 / S32760 Chemical Composition
Mechanical Properties of Super Duplex UNS S32750 / S32760 Pipe Fittings
Super Duplex 2507 Equivalent Grades (UNS S32750 / S32760)
Major Characteristics and Advantages of Super Duplex UNS S32750 / 2507 Pipe Fittings
ASTM A815 Super Duplex Steel Pipe Fittings Applications and industries.
Super Duplex Steel UNS S32760 Pipe Fittings Counties we export.

Standard Specifications for Super Duplex Steel Pipe Fittings (UNS S32750 / S32760)

Specification Parameter	Technical Details
Material Grades	Super Duplex stainless steel UNS S32750 (2507) and UNS S32760
Product Standard	ASTM A815 / ASME SA815 – Specification for wrought ferritic–austenitic (duplex) stainless steel piping fittings
Dimensional Standards	ASME/ANSI B16.9 (Butt weld), ASME B16.28 (Short radius elbows), MSS SP-43 (Fabricated fittings)
Manufacturing Routes	• Seamless, welded, and fabricated butt weld fittings • Forged and socket weld fittings for high-pressure service
Size Range	Typically ½" NB to 36" NB (Larger custom sizes available on request)
Wall Thickness / Schedule	Sch 10S, 40S, 80S, 160, XXS, and custom wall thicknesses to match pipe schedules
End Preparation	Bevelled ends to ASME B16.25 (standard for butt weld) or Plain Ends (PE) when specified
Forms Available	Elbows, Tees, Reducers, Stub Ends, Caps, Crosses, and Special Forged Fittings

What are Super Duplex UNS S32750 / S32760 Pipe Fittings?

Super Duplex UNS S32750 / S32760 is a new generation of austenitic-ferritic stainless steel which performs better than conventional austenitic and ferritic in all respects. Its distinctive duplex micro fabrication combines the two worlds the hardness of ferrite and the corrosiveness of austenite. Super Duplex S32750 pipe fittings are high yield and tensile strength, high pitting/crevice corrosion resistance, high chloride induced stress corrosion cracking. Elbows, tees, reducers, caps and stub ends, made in this grade, are used to modify direction, branch, reduce or end high pressure piping systems, with high temperatures and chloride content, where no longer reliable are the 300-series stainless steels.

UNS S32760 is almost identical in Super Duplex grade with a somewhat altered chemistry, including generally more molybdenum and other alloying elements. This modification typically leads to an increased number of pitting resistance equivalent and even higher corrosion resistance in specifically harsh chloride or sour conditions, and slightly different mechanical and corrosion behaviour in a particular design case. In practice, the most commonly used Super Duplex grade in offshore, desalination, chemical processing and power projects is UNS S32750 (2507) and UNS S32760 is commonly used when the highest possible corrosion margin is needed, or when new fittings need to be compatible with existing S32760 pipework and equipment. Solitaire Overseas is a manufacturer and store of Super Duplex UNS S32750 pipe fittings in standard form and is also capable of producing UNS S32760 fittings to project-specific material requirements and customer demands.

Types of Super Duplex UNS S32750 / S32760 Buttweld Pipe Fittings & Size Range

Solitaire Overseas supplies a comprehensive range of Super Duplex buttweld fittings designed for severe service conditions:

Elbows : 45°, 90°, and 180° long radius (LR) and short radius (SR).
Tees : Equal tees for straight branching and reducing tees for varying pipe sizes.
Reducers : Concentric and eccentric reducers for flow transition.
Caps : End caps to terminate or seal high-pressure lines.
Stub Ends : Short and long pattern stub ends for lap joint flange assemblies.
Specialties : Crosses, laterals, 3D/5D/10D bends, and custom fittings to drawing.

Fitting Type	Nominal Size Range (NPS)	Schedule Range	Remarks
45° / 90° / 180° Elbows (LR/SR)	½" – 24"	Sch 10S – Sch XXS	Seamless up to selected sizes; welded/fabricated for larger diameters
Equal Tees	½" – 24"	Sch 10S – Sch XXS	Straight-through branch connections
Reducing Tees	1" × ½" – 24" × 20"	Sch 10S – Sch XXS	Branch size smaller than run size
Concentric Reducers	1" × ½" – 24" × 12"	Sch 10S – Sch XXS	Concentric bore transition
Eccentric Reducers	1" × ½" – 24" × 12"	Sch 10S – Sch XXS	Used in horizontal lines to maintain bottom-of-pipe level
End Caps	½" – 24"	Sch 10S – Sch XXS	Line termination and test closures
Stub Ends (Short / Long)	½" – 24"	Sch 10S – Sch XXS	Used with lap joint flanges

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Super Duplex Steel UNS S32750 / S32760 Chemical Composition

The exceptional corrosion resistance of Super Duplex stainless steels is directly related to their chemical composition. High chromium and molybdenum contents, combined with nitrogen additions, deliver a high Pitting Resistance Equivalent Number (PREN >40) and strong resistance to localized attack

Grade	C	Mn	Si	P	S	Cr	Ni	Mo	N	Fe
S32750	≤ 0.030	≤ 1.20	≤ 0.80	≤ 0.035	≤ 0.020	24.0 – 26.0	6.0 – 8.0	3.0 – 5.0	0.24 – 0.32	Bal
S32760	≤ 0.030	≤ 1.00	≤ 1.00	≤ 0.030	≤ 0.010	24.0 – 26.0	6.0 – 8.0	3.0 – 4.0	0.20 – 0.30	Bal

Mechanical Properties of Super Duplex UNS S32750 / S32760 Pipe Fittings

Super Duplex S32750 / S32760 pipe fittings offer mechanical properties significantly higher than common austenitic grades such as 304L and 316L, enabling design optimization and lightweight systems.

Grade	Density (g/cm³)	Tensile Strength (min)	Yield Strength 0.2% Proof (min)	Elongation (min)	Melting Point
S32750	7.8	800 MPa	550 MPa	15%	≈ 1350°C
S32760	7.8	> 750 – 800 MPa	> 550 MPa	15%	≈ 1350°C

Mechanical Properties by Temper

Condition: For Tube sizes 0.125" OD or larger, with 0.015" wall or heavier

Alloy	Temper	Tensile Strength (KSI)	Yield Strength (KSI)	Min. Elongation (2")	Rockwell Hardness
718	Annealed	155 max	40 - 85	30%	-
718	Half Hard	140 - 190	90 - 150	7%	C 25 - C 38
718	Full Hard	140 min	140 min	3%	C 35 min

Super Duplex 2507 Equivalent Grades (UNS S32750 / S32760)

Super Duplex 2507 is referenced under different designations in various standards. A clear grade equivalence table helps avoid mis-specification and supports global sourcing

Grade	UNS	Werkstoff Nr.	EN / DIN	AFNOR	Common Trade Name
Super Duplex 2507	S32750	1.4410	X2CrNiMoN25-7-4	Z3 CND 25.06 Az	SAF 2507® (or equivalent)
Super Duplex S32760	S32760	1.4501	X2CrNiMoCuWN25-7-4	Z3 CND 25.06 AZW (typ.)	ZERON® 100 (or equivalent)

Major Characteristics and Advantages of Super Duplex UNS S32750 / 2507 Pipe Fittings

The use of Super Duplex pipe fittings of Solitaire Overseas offers some technical and commercial benefits:

Exceptional Corrosion Protection - The high levels of chromium, molybdenum and nitrogen provide the highest levels of resistance to pitting and crevice corrosion in seawater, brines and crevice corrosion in chloride bearing process streams.
Very High Strength - The yield strength is approximately twice that of 304/316 stainless steel, which makes the walls thinner or the allowable design pressure higher, thus making it weight and cost-efficient at the system level.
Stress Corrosion Cracking (SCC) Resistance - The duplex microstructure is highly resistant to chloride SCC than austenitic stainless steels particularly under high temperatures.
Fabrication and good Weldability - When welding Super Duplex fittings, the welding can be done with the right welding techniques and filler selection, and modifications made to the shop and on-site without compromising the performance of the fittings.
Complete Traceability and Certification - EN 10204 3.1 test certificates, third party inspection reports and full documentation packages can be provided to comply with the requirements of the stringent QA/QC.

ASTM A815 Super Duplex Steel Pipe Fittings Applications and industries.

ASTM A815 Super Duplex S32750 / S32760 pipe fittings have been popular in:

Offshore and Onshore Oil & Gas - Flowlines, risers, manifolds, injection system and produced-water system, exposed subsea and topside piping exposed to high chlorides and H 2S.
Petrochemical Processing and Chemical- Distributing the aggressive acid, brine, caustics and mixed chemical streams in which the regular stainless steel may be inadequate.
Seawater Handling & Desalination -RO feed lines of high pressure, seawater intake and outfall lines, recirculation and discharge systems of brine.
Power Generation -Coastal water-cooled condensers, cooling water systems and connections with critical heat exchangers.
Marine & Shipbuilding- Ballast systems, cooling systems and general seawater service lines with long term corrosion protection requirements.

Super Duplex Steel UNS S32760 Pipe Fittings Counties we export.

Solitaire Overseas is a reliable international provider of high-performance piping systems. Super Duplex UNS S32750 / S32760 pipe fittings are exported by us to clients in different parts of the globe to meet critical projects, shutdowns, and MRO demands. The export division will handle all the logistical services such as export-worthy packaging and all documents (MTC 3.1, Certificate of Origin, etc.) to facilitate a smooth delivery.

Region	Key Export Markets	Typical Industries Served
Asia	India, Thailand, Singapore, Malaysia, Indonesia, Vietnam, South Korea, Bangladesh, Sri Lanka	Refineries, Petrochemicals, Power Generation, Desalination, Shipyards
Middle East	UAE, Saudi Arabia, Oman, Qatar, Kuwait, Bahrain, Jordan, Iraq	Oil & Gas (Upstream/Downstream), Offshore Platforms, Desalination Plants
Europe	United Kingdom, Germany, Italy, France, Spain, Belgium, Netherlands, Norway	Chemical Plants, Offshore Wind Farms, Marine Engineering, Power
Africa	South Africa, Ghana, Egypt, Nigeria, Algeria, Angola	Oil & Gas pipelines, Mining, Power Infrastructure
Americas	USA, Canada, Brazil, Mexico, Argentina, Chile, Colombia	Offshore & Onshore Oil & Gas, Petrochemicals, Mining Slurry Systems
Oceania	Australia, New Zealand	LNG Terminals, Offshore Drilling, Mining, Power

Frequently Asked Questions Super Duplex UNS S32750 / S32760 Pipe Fittings

What is the distinction between S32750 and S32760 pipe fittings Super Duplex?

UNS S32750 and UNS S32760 are also similar Super Duplex stainless steels and are similar in microstructure (duplex austenitic-ferritic), and in alloying contents, which are approximately equal. The main difference is in the finer chemistry: S32760 really contains slightly more molybdenum and other alloying substances, increasing its pitting resistance equivalent number (PREN), and perhaps a small advantage in very unnerving chloride or sour environments. S32750 (also known as Super Duplex 2507) is corrosion resistant and strong enough in most offshore, desalination and chemical services. Designers may discover S32760 instead of a project standard where reasonable, and in existing S32760 equipment, or when they need the highest possible level of corrosion margin of service.

What are the more popular uses of Super Duplex UNS S32750 pipe fittings?

Super Duplex UNS S32750 pipe fittings are chosen when the normal stainless steels fail to provide a desirable combination of high and dendritic resistance. They are common in offshore and onshore systems of oil and gas production, injection and produced-water systems and seawater and firewater systems and undersea manifolds. They are used in other areas outside oil and gas such as desalination plants and seawater management systems, chemical and petrochemical plants, cooling water systems of power plants and bleaching circuits of pulp and paper. They are quite impervious to pitting, crevice corrosion and stress cracking in settings which contain chlorides and are consequently particularly attractive in long-life installations where maintenance can not be easily approached to perform the same.

What is the standard size and size of the Super Duplex 2507 butt weld fittings?

Butt weld fittings of Super Duplex 2507 (UNS S32750) are usually manufactured to ASTM A815 / ASME SA815 which covers fittings made of wrought ferritic-austenitic stainless steel. Dimensional requirements are established on ASME/ANSI B16.9 of factory-made buttwelding fittings, ASME B16.28 of short radius elbows and returns and MSS SP-43 of light-wall stainless fittings. The manufacturers typically offer nominal pipe sizes of 1/2 to at least 24 36 NB, depending on the fitting type and the wall thickness will be corresponding to the popular schedules of pipe, such as Sch 10S, 40S, 80S, 160 and XXS. We are making smooth welded and fabricated elbows and tees, reducing caps and stub ends out of Super Duplex S32750 to fit the design schedule of your pipes according to the design documents.

How does the Super Duplex UNS S32750 fittings perform in the seawater and chloride condition?

UNS S32750 super duplex fittings are fashioned using seawater and chloride applications. With a chromium content of 2426 percent, huge additives of molybdenum and nitrogen and a duplex microstructure, they have very high pitting resistance equivalent number (PREN). This is equivalent to high pitting and crevice corrosion resistance in natural sea water and brines even in a high temperature environment. Furthermore, the stress corrosion cracking of S32750 is much resistant to chloride in the presence rather than when using the regular austenitic stainless steel. Combined with the appropriate system design, welding processes and commissioning activities, the elimination of the potential occurrence of the leakage, down time and costly replacement will ensure long and predictable service in such applications of the Super Duplex S32750 elbows, Tees and reducer, offshore platforms, desalination plants, cooling water systems and other high-chloride installations.