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Super Duplex Steel S32750 / S32760 Tube Fittings Manufacturer & Supplier in India

Super Duplex Tube Fittings

Super Duplex Steel S32750 and S32760 tube fittings are precision-engineered compression fittings manufactured from high-performance super duplex stainless steel alloys (UNS S32750 / UNS S32760, also known as Alloy 2507 / Alloy 2507Cu). These fittings deliver exceptional corrosion resistance, high strength, and long-term durability in demanding environments including offshore oil and gas platforms, chemical processing plants, seawater handling systems, and desalination facilities.

Due to their high chromium, molybdenum, and nitrogen content, Super Duplex instrumentation tube fittings offer strong resistance to chloride stress corrosion cracking, pitting, and crevice corrosion. They also maintain excellent mechanical strength and structural stability in high-pressure and high-temperature applications, ensuring leak-free and reliable performance in critical industrial piping systems.

Kalpataru Piping Solutions is a trusted manufacturer, supplier, and exporter of Super Duplex Steel UNS S32750 and UNS S32760 instrumentation tube fittings used for secure connections in tubing, piping, and hydraulic systems. These Super Duplex compression fittings are widely used in industries such as oil and gas, petrochemicals, marine engineering, power generation, and chemical processing.

Our UNS S32750 union elbow fittings are designed for high-pressure systems and provide excellent fatigue strength and vibration resistance. Super Duplex S32760 bulkhead elbow fittings are suitable for panel or equipment wall mounting, allowing easy system partitioning during inspection and maintenance.

With ISO 9001:2015 certification and over 15 years of manufacturing experience, we supply super duplex tube fittings to oil & gas operators, chemical plants, and marine engineering firms across 40+ countries including UAE, Saudi Arabia, USA, and Singapore.

In addition, Super Duplex Steel S32750 union tee and cross fittings provide reliable branching connections in instrumentation lines. Precision-machined threads and ferrule geometry ensure tight sealing, corrosion resistance, and long service life in demanding industrial environments.

What are Super Duplex Steel S32750 / S32760 Tube Fittings?

Super Duplex Steel S32750 (Alloy 2507, WNR 1.4410) and S32760 (Zeron 100, WNR 1.4501) tube fittings are high-performance compression fittings manufactured from super duplex stainless steel alloys with a balanced 50/50 austenitic-ferritic microstructure. Both grades offer exceptional corrosion resistance and mechanical strength in aggressive chloride environments.

S32750 contains approximately 25% chromium, 7% nickel, and 4% molybdenum with nitrogen additions, providing a PREN (Pitting Resistance Equivalent Number) of approximately 42-43. S32760 features a similar chromium and nickel content but includes tungsten (0.5-1.0%) and copper (0.5-1.0%) additions that enhance resistance to localized corrosion in the most aggressive seawater and sour gas environments.

Both grades are specified interchangeably in many applications, with S32760 chosen when maximum pitting resistance or copper/tungsten-enhanced performance is required for seawater handling or sour service conditions.

S32750 vs S32760 Super Duplex — Key Differences

Property

S32750 (Alloy 2507 / WNR 1.4410)

S32760 (Zeron 100 / WNR 1.4501)

UNS Number

S32750

S32760

Werkstoff Nr.

1.4410

1.4501

Trade Name

Alloy 2507

Zeron 100

Chromium (%)

24–26%

24–26%

Molybdenum (%)

3.0–5.0%

3.0–4.0%

Key Additions vs S32750

W (0.5–1.0%) + Cu (0.5–1.0%) — enhances pitting resistance

PREN (Pitting Resistance)

~42–43

~40–41 (W and Cu compensate)

Primary Application

Offshore, chemical, desalination — general high-corrosion service

Seawater handling, sour service — when Cu and W additions are needed

Tensile Strength

795 MPa min

750 MPa min

Super Duplex Steel S32750 tube fittings Types

Explore different fitting types available in super duplex tube fittings material designed to withstand demanding operating conditions.

Specification of Super Duplex Steel S32750 Tube Fittings

Super Duplex Steel S32750 Tube Fittings, UNS S32750 Instrumentation Tube Fittings, and Super Duplex Compression Tube Fittings are manufactured according to international standards to ensure high strength, corrosion resistance, and reliable performance in demanding industrial environments.

SpecificationsASTM A182, A276, A479 / ASME SA182, SA276, SA479
Size1/16″ to 1/2″ & 1.5MM to 38.1MM
ThreadNPT, PT, BST, NPS, PS, BSP
Pressure6000PSI for Stainless Steel / 300/1000/3000PSI for Brass
TypesTube to Union, Tube to Male, Tube to Female, Instrument Pipe Fittings, Accessories

UNS S32750 / S32760 Super Duplex Tube Fittings Manufacturing Standards

Super Duplex Steel S32750 Tube Fittings, UNS S32760 Tube Fittings, and Super Duplex 2507 Compression Tube Fittings are manufactured according to internationally recognized standards to ensure dimensional accuracy, mechanical strength, and corrosion resistance in industrial piping and instrumentation systems.

American StandardManufacturing Form
ASTM A276Super Duplex stainless steel bars used for machining tube adapters and straight fittings
ASTM A479Stainless steel bars for pressure vessel and high-temperature applications
ASTM A276M / ASTM A479MMetric versions of ASTM A276 and A479 specifications
ASME SA 276 / SA 479ASME equivalent standards for stainless steel bars used in piping systems
ASTM A182Forged or rolled alloy and stainless steel fittings such as compression cross fittings
ASME SA 182ASME specification for forged stainless steel fittings including compression tee
ASTM A182MMetric specification for forged stainless steel fittings
ASME SA 789Seamless and welded ferritic/austenitic stainless steel tubing used in instrumentation systems
ASTM A240 / ASME SA 240Plate, sheet, and strip used for pressure vessels and general stainless steel applications

Super Duplex S32750 / S32760 Compression Tube Fittings Sizes

Alloy 2507 Tube Fittings, Super Duplex S32750 Compression Fittings, and UNS S32760 Instrumentation Tube Fittings are available in multiple sizes to support high-pressure hydraulic and instrumentation systems.

Tube Fittings TypesForms of Super Duplex 2507 Tube FittingsSize ODSize Inch
Tube To UnionUnion Tee, Bulkhead Union, Union Elbow, Reducing Elbow, Union Cross6mm to 38mm1/4″ to 1 1/2″
Tube to Male FittingsMale Connector, Male Bulkhead Connector, Male Elbow, Male Run Tee, Male Branch Tee6mm to 38mm1/4″ to 1 1/2″
Tube to Female FittingsFemale Connector, Female Bulkhead Connector, Female Run Tee, Female Branch Tee6mm to 38mm1/4″ to 1 1/2″
Tube to Pipe FittingsFemale Elbow, Street Elbow, Allen Key, Bushing, Female Cap, Female Cross, Female Elbow, Female Tee, Hex Coupling, Hex Nipple, Male Elbow, Male Female Adapter, Male Female Branch Tee, Male Tee, Reducing Hex Coupling, Reducing Hex Nipple, Street Elbow, Street Tee, Union Joint Ball6mm to 38mm1/4″ to 1 1/2″
Tube Fittings AccessoriesBlanking End, Blanking Plug, Tube Nut, Front Ferrule, Back Ferrule6mm to 38mm1/4″ to 1 1/2″

Sizes of SDSS Tube Union

Super Duplex Stainless Steel Tube Union Fittings, UNS S32750 Tube Unions, and Super Duplex 2507 Union Fittings are produced in various BSPT and BSPP thread sizes to ensure leak-tight pipe connections.

DashBSPT & BSPPSizeSize & Pitch
inch – TPI-105/8 – 14
-201 1/4 – 11-41/4 – 19
-483 – 11-241 1/2 – 11
-81/2 – 14-63/8 – 19
-402 1/2 – 11-322 (11)
-123/4 – 14-161 – 11
-21/8 – 28  

Super Duplex Blanking Plug Metric Sizes

Super Duplex S32750 Blanking Plugs, UNS S32760 Pipe Plugs, and Super Duplex 2507 Threaded Plugs are manufactured in metric sizes to provide secure sealing in tubing and piping systems.

Metric sizes (Inches)Size (mm)
125 mm
3/420 mm
3/812 mm
5/1610 mm
3/166 mm

S32750 Female Elbow Thread I.D

Super Duplex S32750 Female Elbow Fittings, UNS S32750 Threaded Elbows, and Super Duplex Instrumentation Elbow Fittings are designed with precise thread inner diameters to ensure standardized and leak-proof connections.

BSPP Female Thread I.Dinchmm
0.7519,12.26
57,42.8672,6
0.615,23.36
85,40.9724,6
1.2130,71.55
39,40.8220,8
1.7945,50.34
8,60.4711,9
S32760 Male Elbow Thread O.D

Super Duplex S32760 Male Elbow Fittings, UNS S32760 Threaded Elbows, and Super Duplex 2507 Pipe Elbows feature accurately machined thread outer diameters for secure mechanical joints.

BSPT Male Thread O.Dinchmm
0.379,50.5
12,80.6416,3
0.820,40.89
22,51.0225,9
1.2832,61.62
41,11.8547,0
2.3158,62.92
74,13.4186,6

UNS S32750 / S32760 Super Duplex Tube Fitting Connection Types

Super Duplex Steel S32750 Tube Fittings, UNS S32760 Hydraulic Tube Fittings, and Super Duplex 2507 Instrumentation Fittings are available with multiple connection types for complex piping systems.

  • JIC
  • Butt weld
  • Socket weld
  • Threaded
  • Welding

Grades & Variants of SDSS Tube Fittings

Super Duplex Stainless Steel Tube Fittings, UNS S32750 Tube Fittings, and UNS S32760 Tube Fittings are supplied in different grades and alloy variants to meet diverse industrial requirements.

  • 6MO Alloy Tube Fittings
  • Super Duplex 2507 Grade Tube Fittings
  • UNS S32750 Tube Fittings
  • UNS S32760 Tube Fittings
  • 254 SMO Alloy Tube Fittings

Material Configurations of 25Cr SDSS Instrumentation Fittings

Super Duplex Instrumentation Tube Fittings, UNS S32750 Instrumentation Fittings, and Super Duplex 2507 Ferrule Fittings are engineered for precise instrumentation and process control applications.

  • Female Connectors
  • Adjustable Elbows and Tees
  • Tube-to-Male Connections
  • Tube-to-Tube Couplings
  • Tube Closures
  • Ferrule Assemblies, Weld Connectors, and Nuts

Chemical Composition of Super Duplex Tube Fittings

WNR 1.4410 (UNS S32750) Chemical Composition

ElementNameComposition
CrChromium24.0% – 26.0%
NiNickel6.0% – 8.0%
MoMolybdenum3.0% – 5.0%
NNitrogen0.24% – 0.32%
CCarbon0.030% max
MnManganese1.20% max
PPhosphorus0.035% max
SSulfur0.010% max
CuCopper0.50% max

WNR 1.4501 (UNS S32760) Chemical Composition

WNR 1.4501 Super Duplex Ferrule Fittings, UNS S32760 Tube Fittings, and Super Duplex 2507 Compression Fittings contain a balanced chemical composition that enhances corrosion resistance, mechanical strength, and resistance to chloride stress corrosion cracking.

ElementNameComposition
CrChromium24.0% – 26.0%
NiNickel6.0% – 8.0% min.
MoMolybdenum3.0% – 5.0%
CuCopper0.50% max
SSulfur0.010% max
MnManganese1.20% max
PPhosphorus0.035% max
CCarbon0.030% max

Equivalent Material Grades of Super Duplex Tube Fittings

Super Duplex 2507 Tube Fittings, UNS S32750 Tube Fittings, and WNR 1.4410 Stainless Steel Tube Fittings correspond to equivalent international material grades.
STANDARD UNS WERKSTOFF NR. Trade Name
Super Duplex 2507 S32750 1.4410 Alloy 2507
Super Duplex Zeron 100 S32760 1.4501 Zeron 100

Mechanical Properties of Super Duplex Steel S32750 Tube Fittings

Super Duplex Steel S32750 Compression Tube Fittings, UNS S32750 Instrumentation Tube Fittings, and Super Duplex 2507 Pipe Fittings offer high tensile strength and excellent mechanical performance.

Properties

Values
Elongation15%
Yield Strength550 MPa
Tensile Strength795 MPa
Hardness (HB)310

Physical Properties of S32760 Stainless Adapter Fittings

Super Duplex S32760 Adapter Fittings, UNS S32760 Stainless Steel Adapters, and Super Duplex 2507 Instrumentation Adapters exhibit reliable physical properties suitable for corrosive and high-pressure environments.

PropertiesValues
Densityg/cm³: 7.8 / lb/in³: 0.28
Modulus of elasticityGPa: 200, 194, 186, 180 / psi x 10-6: 29
Poisson’s ratio0.3
Linear expansion (RT → T)°Cx 10-6/°C: 13, 13.5, 14
Thermal conductivityW/m°C: 15, 16, 17, 18 / Btu/h ft°F: 8.7
Thermal capacityJ/kg°C: 500, 530, 560, 590
Electric resistivityµΩm: 0.8, 0.85, 0.9, 1

Density of Alloy 2507 Hydraulic Fittings

Alloy 2507 Hydraulic Tube Fittings, Super Duplex S32750 Hydraulic Fittings, and UNS S32760 Hydraulic Connectors provide an excellent strength-to-weight ratio for demanding industrial systems.

DensityValues
lb/in³0.281
g/cm³7.8
Temperature Range of WNR 1.4410 Flare Fittings

WNR 1.4410 Super Duplex Flare Fittings, UNS S32750 Flare Tube Fittings, and Super Duplex 2507 Flare Connectors operate effectively across a wide temperature range.

PropertiesValuesValues
Temperature Range°F°C
 -58° to 572°-50° to 300°C

Pressure Limit of S32750 / S32760 Stainless Bushings

Super Duplex S32750 Bushings, UNS S32760 Threaded Bushings, and Super Duplex 2507 Pipe Bushings are designed to handle high pressure in demanding industrial piping applications.

SizePressure
Over 9/16″10,000 psig / 690 bar
up to 9/16″20,000 psig / 1380 bar
up to 1/2″15,000 psig / 1040 bar
Over 1/2″3600 psig / 250 bar

Super Duplex Female Run Tee Pressure Rating

Super Duplex Female Run Tee Fittings, UNS S32750 Run Tee Connectors, and Super Duplex 2507 Instrumentation Tee Fittings offer reliable pressure performance in instrumentation systems.

Non-positionableSAE / MS Thread SizeDesignatorpsig (bar)
5076 (349)
5/16-242ST3/8-243ST
7/16-204ST1/2-205ST
9/16-186ST4568 (314)
3/4-168ST3625 (249)
7/8-1410ST

Advantages of Super Duplex 2507 / S32750 Tube Fittings

Super Duplex Steel 2507 Tube Fittings, UNS S32750 Tube Fittings, and UNS S32760 Compression Fittings provide exceptional corrosion resistance, strength, and durability compared to standard stainless steel fittings.

  • Exceptional durability against fatigue and erosion
  • Impressive structural strength
  • Outstanding resistance to cracking
  • Low thermal expansion coefficient, providing dimensional stability across a wide temperature range
  • Strong protection against crevice corrosion

Installation Guide for Super Duplex Steel S32750 / S32760 Tube Fittings

Proper installation of Super Duplex Steel tube fittings is essential to ensure leak-free performance and long service life in high-pressure instrumentation and hydraulic systems. Follow the steps below for correct installation.
Step-by-Step Installation Procedure

  1. Cut the tube square using a proper tube cutter. Avoid using a hacksaw as it may create uneven edges that affect sealing performance.
  2. Deburr the tube ends thoroughly on both the inside and outside edges to remove sharp burrs that could damage the ferrule or fitting components.
  3. Insert the tube fully into the fitting body until it reaches the internal tube stop. Full insertion is critical to ensure proper ferrule grip and sealing.
  4. Slide the nut and ferrule(s) onto the tube in the correct orientation before tightening.
  5. Finger-tighten the nut until resistance is felt.
  6. Mark the nut position with a marker to track the correct tightening rotation.
  7. Tighten the nut using a wrench according to the ferrule design:
    • Single ferrule fittings: Tighten approximately 1¼ turns past finger-tight.
    • Double ferrule fittings: Tighten approximately 1½ turns past finger-tight.
  8. For reassembly, tighten the nut only ¼ turn past finger-tight to restore the seal.

Torque Recommendation

For critical applications, use a calibrated torque wrench to achieve consistent tightening. Torque values may vary depending on tube size, pressure rating, and fitting design, therefore it is recommended to follow the manufacturer’s torque specifications or pressure rating tables for accurate tightening values.

Proper installation helps maintain leak-free sealing, vibration resistance, and long-term reliability in high-pressure instrumentation and process control systems.

Installation of Super Duplex Hex Nipple Fittings

Super Duplex Hex Nipple Fittings, UNS S32750 Threaded Nipples, and Super Duplex 2507 Pipe Nipples should be installed using correct ferrule and threaded connection methods to ensure leak-free operation.

InstallationType
Single FerruleSleeve Type
Metric threadBulkhead Union Elbow
MetricJIC
ThreadedNPT
BSPSuper Duplex Male Street Tee
Double Ferrule3000-10000 PSI pressure
Port Size: 1/16″ to 1 1/2″Super Duplex Stainless Steel Tube Nuts
UNFDouble Ferrule
NPT3000-6000 Psig pressure
BSPTBranch Reducing Tee
Male To FemaleRound head
ThreadedStreet Elbow
Round headThreaded
Super Duplex Female Thread ElbowDouble Ferrule
3000-6000 Psig pressureUNF
NPTBSPT
SDSS Bulkhead UnionSingle Ferrule
Sleeve TypeMetric thread
CrossRound head
ThreadedSuper Duplex Female Run Tee

HS Code of WNR 1.4410 / WNR 1.4501 Tube Fittings

WNR 1.4410 Super Duplex Tube Fittings, WNR 1.4501 Instrumentation Fittings, and Super Duplex 2507 Pipe Fittings are classified under standardized HS codes for international trade and export documentation.

PropertyValue
HS Code72192190

Applications of Super Duplex Steel S32750 / S32760 Tube Fittings

Super Duplex Steel S32750 and S32760 tube fittings are widely used in industries where piping systems are exposed to aggressive chemicals, seawater, and high-pressure operating conditions. Their excellent resistance to chloride-induced corrosion, high mechanical strength, and long service life make them suitable for critical instrumentation and hydraulic systems.

Some common real-world applications include:

  • Subsea control line connections in deepwater oil fields, where fittings must withstand high pressure, seawater exposure, and extreme operating conditions.
  • Hydraulic line fittings on offshore drilling rigs, ensuring leak-free fluid transfer in high-pressure hydraulic systems.
  • Sampling system connections in desalination plants, where corrosion-resistant fittings are required for seawater processing and monitoring systems.
  • Instrument air line connections in chemical processing units, providing secure and reliable connections for automated control systems.
  • Seawater cooling system connections on FPSOs (Floating Production Storage and Offloading units), where high resistance to pitting and crevice corrosion is essential.

Because of these capabilities, Super Duplex instrumentation tube fittings are frequently used in offshore platforms, petrochemical facilities, marine engineering systems, and high-pressure industrial process lines where reliability and corrosion resistance are critical.

Other Available Stock of Super Duplex Steel Instrumentation Tube Fittings
  • Super Duplex Steel Swagelok instrumentation Fittings
  • ASTM A182 Super Duplex Steel S32760 Reducing Union Tee
  • Super Duplex 2507 45 Degree Positionable Male Elbow
  • ASTM A276 Super Duplex Steel S32750 Ferrule Nut
  • Super Duplex Steel S32760 Positionable Male Run Tee
  • Super Duplex Steel S32750 /S32760 Hex Plug
  • ASTM A182 Super Duplex S32750 Tube End Closure
  • ASME SA182 S32750 Super Duplex Steel Fitting End Closure
  • 2507 Super Duplex Steel Parker Compression Fittings
  • Super Duplex Steel A182 S32750 Bulkhead Reducing Union
  • Super Duplex Steel S32750 Hydraulic Fittings in India
  • Super Duplex Steel Single Ferrule Compression Fittin
  • Super Duplex Steel S32760 Ferrule Fitting Supplier
  • UNS S32750 Bulkhead Lock Nut
  • Super Duplex S32750 Positionable Male Elbow
  • Super Duplex Steel S32760 Hex Nipple
  • Super Duplex Steel S32750 / S32760 Hex Bushing
  • SA479 Super Duplex Steel S32750 Male Adapter
  • Super Duplex Steel DIN 1.4410 Female Adapter
  • Super Duplex Steel S32750 /S32760 Allen Key Plug
  • UNS S32750 /S32760 Instrumentation Pipe Fittings
  • Super Duplex Steel S32750/ S32760 Tube Cap Fittings
  • Super Duplex Steel Tylok Instrumentation Fittings
  • S32750 /S32760 Super Duplex Steel Union Joint Ball
  • Super Duplex S32760 Two Ferrule Compression Fitting
  • Super Duplex Steel S32750 Ferrule Tube Fittings
  • Super Duplex 2507 High Pressure Hydraulic Tube Fittings
  • DIN 1.4410 Front Ferrule
Related Products

Need Super Duplex S32750 or S32760 Tube Fittings for your project?

Kalpataru Piping Solutions supplies certified instrumentation fittings to 40+ countries with ISO 9001:2015 quality assurance.

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FAQ’s About Super Duplex Steel S32750 tube fittings

A: UNS S32750 (Alloy 2507, WNR 1.4410) is a super duplex stainless steel with 25% chromium, 7% nickel, and 4% molybdenum. It offers higher strength and corrosion resistance than standard duplex grades (S31803/S32205) and is specified for offshore, chemical, and desalination service where chloride-induced corrosion is the design-limiting factor.

A: Both are super duplex stainless steel with similar chromium and nickel content. S32760 (Zeron 100, 1.4501) adds tungsten and copper to the S32750 chemistry, providing equivalent or slightly better pitting resistance in seawater service. Both grades are interchangeable in most applications — S32760 is preferred when the service involves sour gas or aggressive seawater.

A: Material standards: ASTM A276 and ASTM A479 for bar and wire; ASTM A182 for forgings; ASME SA 789 for tubes. Fitting standards: ASTM A182, ASME SA182. Thread standards: NPT, BSP, BSPT. Size standards: ASME B16.11 for socket weld and threaded fittings.

A: Primary applications include subsea control systems, offshore hydraulic lines, desalination sampling systems, seawater cooling on FPSOs, and instrument connections in chemical processing plants where resistance to chloride stress corrosion cracking and pitting is mandatory.