Kalpataru Piping Solution is a certified manufacturer and exporter of Super Duplex pipe fittings in grades UNS S32750 pipe fittings and UNS S32760 pipe fittings as per ASTM A815 and ASME SA815 standards. These fittings have a duplex austenite ferrite structure which provides about double the yield strength of regular austenitic stainless steels. The high chromium content (24-26%), molybdenum (3-5%) and nitrogen content give them a high resistance to pitting, crevice corrosion and stress corrosion cracking in aggressive chloride and sulphide rich environments.
Super Duplex 2507 pipe fittings and variants of S32760 provide enhanced resistance in challenging environments such as offshore oil and gas rigs, desalination facilities, and chemical processing units. They have a Pitting Resistance Equivalent Number (PREN) of over 40 and are more resistant to pitting than the standard 316L and duplex 2205 grades in high chloride, acidic conditions and under high temperatures. S32760 also has extra copper and tungsten, and this is the most suitable material for the most demanding process environments. For the wider product range, see our Super Duplex Steel Pipe Fittings hub or browse related Duplex Steel Pipe Fittings.
Super Duplex Steel UNS S32750 bend pipe fittings can be processed and welded using standard fabrication practices without difficulty. ASTM A815 Super Duplex fittings intended for service involving discontinuous heating between 427 and 899 degrees Celsius, or for welding under conditions that rule out a post weld anneal, should be specified and reviewed carefully with your fabricator at the design stage. Super Duplex Steel UNS S32750 end cap pipe fittings are non magnetic, and their high temperature creep strength and stress rupture resistance are superior to standard duplex grades. The room temperature yield strength and tensile strength of ASME SA815 pipe fittings in grade S32760 are 550 MPa (80,000 psi) and 800 MPa (116,000 psi) respectively, consistent with the verified mechanical properties table below.
Table of Contents
- Super Duplex Steel UNS S32750 / S32760 Butt Weld Pipe Fittings Specification
- Super Duplex Steel Equivalent Standard Grades
- UNS S32750 & S32760 Pipe Fittings Types
- ASTM A815 Chemical Composition
- ASME SA815 Mechanical Properties
- Dimensional Tolerances
- Weight Chart
- S32750 vs S32760
- Packing & Delivery Details
- Available Stock of ASTM A815 S32760 Pipe Fittings
- Applications of Super Duplex Pipe Fittings
- FAQ’s About Super Duplex Steel Pipe
Super Duplex Steel UNS S32750 S32760 Butt Weld Pipe Fittings Specification
Specification | Details |
Standard | ASTM A815 / ASME SA815 |
Dimensions | ASME/ANSI B16.9, ASME B16.28, MSS-SP-43, BS4504, BS1560, BS10, ASME B16.11, MSS SP-79/83/95/97, BS 3799 |
Size | Seamless butt weld fittings: 1/2 inch to 10 inch. Welded butt weld fittings: 1/2 inch to 48 inch |
Schedule | SCH10, SCH20, SCH30, STD, SCH40, SCH60, XS, SCH80, SCH100, SCH120, SCH140, SCH160, XXS, available with NACE MR0175 |
Thickness | 20 SWG to 10 SWG, and Sch 10, Sch 40, Sch 80 |
Type | Seamless, ERW, welded, fabricated |
Bending Radius | R = 1D, 2D, 3D, 5D, 6D, 8D, 10D, or custom |
HS Code | 7307.21 (stainless steel flanges, elbows, and fittings); confirm full 8 digit HSN with your customs broker |
Super Duplex Steel UNS S32750 S32760 Buttweld Fittings Equivalent Standard Grade
| Common Name | UNS | Werkstoff Nr. | ASTM Forging Grade | ASTM Pipe Spec | ||
| Super Duplex 2507 / F53 | S32750 | 1.4410 | ASTM A182 F53 | ASTM A790 | ||
| Zeron 100 / F55 | S32760 | 1.4501 | ASTM A182 F55 | ASTM A790 | ||
UNS S32750 & S32760 Super Duplex Stainless Steel Pipe Fittings Types
ASTM A815 Super Duplex Stainless Steel Fittings Chemical Composition
Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
S32750 | 0.030 max | 1.20 max | 0.80 max | 0.035 max | 0.020 max | 24.00-26.00 | 3.00-5.00 | 6.00-8.00 | 0.24-0.32 | 58.095 min |
S32760 | 0.05 max | 1.00 max | 1.00 max | 0.030 max | 0.010 max | 24.00-26.00 | 3.00-4.00 | 6.00-8.00 | 0.20-0.30 | 57.61 min |
ASME SA815 Super Duplex Steel Buttweld Pipe Fittings Mechanical Properties
Grade | Density | Melting Point | Tensile Strength | Yield Strength (0.2% offset) | Elongation |
S32750 / S32760 | 7.8 g/cm3 | 1350°C (2460°F) | 800 MPa (116,000 psi) | 550 MPa (80,000 psi) | 15% |
Super Duplex Stainless Steel UNS S32750 / S32760 Pipe Fittings - Dimensional Tolerances
Notes: out of round equals the sum of positive and negative tolerances. OD = outside diameter, ID = inside diameter. Wall thickness and ID must be specified by the purchaser. All values are in inches.
NPS | OD Tolerance | ID Tolerance | Wall Thickness | Centre-to-End | Centre-to-Centre | Back-to-Face | Alignment | Overall Length |
1/2″ – 2 1/2″ | +0.06 / -0.03 | ±0.03 | ≥ 87.5% nominal | ±0.06 | ±0.25 | ±0.25 | ±0.03 | ±0.06 |
3″ – 3 1/2″ | ±0.06 | ±0.06 | ≥ 87.5% nominal | ±0.06 | ±0.25 | ±0.25 | ±0.03 | ±0.06 |
4″ | ±0.06 | ±0.06 | ≥ 87.5% nominal | ±0.06 | ±0.25 | ±0.25 | ±0.03 | ±0.06 |
5″ – 8″ | +0.09 / -0.06 | ±0.06 | ≥ 87.5% nominal | ±0.06 | ±0.25 | ±0.25 | ±0.03 | ±0.06 |
10″ – 18″ | +0.16 / -0.12 | ±0.12 | ≥ 87.5% nominal | ±0.09 | ±0.38 | ±0.25 | ±0.06 | ±0.09 |
20″ – 24″ | +0.25 / -0.19 | ±0.19 | ≥ 87.5% nominal | ±0.09 | ±0.38 | ±0.25 | ±0.06 | ±0.09 |
26″ – 30″ | +0.25 / -0.19 | ±0.19 | ≥ 87.5% nominal | ±0.12 | N/A | N/A | N/A | ±0.19 |
32″ – 48″ | +0.25 / -0.19 | ±0.19 | ≥ 87.5% nominal | ±0.19 | N/A | N/A | N/A | ±0.19 |
This table was retained unchanged; it was already more detailed than the competitor benchmark and required no corrections.
ASTM A182 vs ASTM A815: Which Standard Applies
Buyers sometimes ask which specification governs a given Super Duplex fitting. ASTM A182 covers forged fittings, including socket weld and threaded types, in pressure classes 3000 pound through 9000 pound, for grades F53 (S32750) and F55 (S32760). ASTM A815, the standard this page covers, governs wrought Super Duplex butt weld fittings such as elbows, tees, reducers, and caps. Both standards require solution annealing and quenching of the final product to maintain the correct austenite to ferrite phase balance.
Welding and Hot Forming of Super Duplex Stainless Steel Fittings
Welding Super Duplex fittings requires controlled interpass temperature, generally kept below 150 degrees Celsius, matched or slightly over alloyed filler metals such as ER2594, and post weld solution annealing where required. Correct procedure keeps the ferrite to austenite phase ratio in the 40 to 60 percent range, which is essential for preserving corrosion resistance.
Hot forming must be conducted in the 1000 to 1150 degree Celsius range followed by rapid water or air quench to prevent sigma phase and chi phase precipitation. Forming outside this window, particularly within the 600 to 950 degree Celsius sensitization range, can severely compromise toughness and corrosion properties. Super Duplex components should also avoid extended exposure in the 350 to 500 degree Celsius range, where 475 degree embrittlement becomes a risk over time.
Impact Toughness and Ferrite Content
Property | Requirement |
Ferrite Content | 40 to 60 percent (tested per ASTM E562) |
Charpy V-Notch Impact | 45 J minimum at -46°C (per ASTM A370) |
Corrosion Testing | ASTM G48 Method A (pitting and crevice resistance) |
S32750 vs S32760 Comparison
Property | S32750 | S32760 |
UNS | S32750 | S32760 |
Werkstoff No. | 1.4410 | 1.4501 |
PREN Value | ≥ 40 | ≥ 40 |
Copper Content | No | Yes (improves corrosion resistance) |
Tungsten | No | Yes |
Application | General offshore and chemical | More aggressive environments |
Cost | Lower | Slightly higher |
This table was retained unchanged; it was already accurate and consistent with the corrected equivalent grades table above.
Packing & Delivery Details
- Wooden boxes and crates for export shipments
- Fumigated packaging as per international standards
- Plastic end caps for protection
- Wrapped with bubble sheet or shrink film
- Marking with grade, size, and heat number
- Fast delivery from ready stock
Weight Chart of Super Duplex S32750 S32760 Pipe Fittings (Schedule 40)
Approximate weights for Schedule 40 buttweld fittings. Specify your exact schedule when requesting a quote, since weight varies with wall thickness.
Size | Elbow (kg) | Tee (kg) | Reducer (kg) |
1/2″ | 0.15 | 0.20 | 0.18 |
1″ | 0.35 | 0.50 | 0.45 |
2″ | 1.20 | 1.80 | 1.50 |
4″ | 3.50 | 5.00 | 4.20 |
6″ | 7.80 | 11.00 | 9.50 |
Other Available Stock of ASTM A815 Super Duplex S32750 S32760 Pipe Fittings
- Super Duplex Steel UNS S32760 90 Deg Elbow Dealer
- Super Duplex Steel UNS S32750 45 Deg Elbow Stockist
- ASTM A815 Super Duplex Steel UNS S32760 Equal Tee
- Super Duplex Steel UNS S32750 Unequal / Reducing Tee
- Super Duplex Steel S32760 Eccentric Reducer Supplier
- ANSI/ ASME B16.9 Super Duplex Steel S32750 End Cap
- Super Duplex UNS S32750 Reducing Nipple Trader
- SA815 Super Duplex S32760 Concentric Reducer
- UNS S32750 90 Deg Short Radius Elbow
- S32760 Super Duplex Steel Short Stub End Stockholder
- ASME SA815 Super Duplex UNS S32750 Barrel Nipple
- B16.9 Super Duplex Steel S32760 45 Deg Long Radius Elbow
- Super Duplex Steel UNS S32750 Long Stub End
- Super Duplex Steel S32760 Straight Tee in India
- Super Duplex Steel UNS S32750 Lap Joint Stub End
- ASTM A815 Super Duplex Steel S32750 /S32760 Tee
- UNS S32750 /S32760 Super Duplex Steel Cross Fitting
- ASTM A815 S32750 /S32760 Super Duplex Steel Stub End
- ASTM A815 Super Duplex Steel S32760 Piggable Bend
- Grade S32750 Super Duplex Steel Long Radius Elbow
- SA815 Super Duplex Steel S32760 Short Radius Elbow
- Super Duplex 2507 Swage Nipple / Reducing Nipple
- B16.9 Super Duplex Steel UNS S32760 Unequal Cross
- Super Duplex UNS S32750/S32760 Bend in Mumbai
- Super Duplex UNS S32750 U Bend Wholesaler
- Super Duplex Steel S32750 Pipe End Cap
- Super Duplex Steel S32760 Seamless Pipe Fittings
- S32750/S32760 Super Duplex Steel Buttweld Cap
- Super Duplex S32760 Pipe Nipple Distributors
- Super Duplex Steel 2507 Pipe Fittings Exporter
- Super Duplex Steel DIN 1.4410 Pipe Fittings
- Super Duplex UNS 32750/32760 Long Radius Bend
- DIN 1.4410 180° Return Bends Supplier
- 2507 Super Duplex Stainless Steel 1D / 3D / 5D Elbow
- Super Duplex S32750/S32760 ASME B16.9 Buttweld Bend
- Super Duplex Steel 2507 Seamless / Welded Elbow
Applications of Super Duplex Steel UNS S32750 / S32760 Pipe Fittings
Super Duplex stainless steel UNS S32750 / S32760 pipe fittings are widely used in industries that require exceptional strength, corrosion resistance, and durability in extreme environments. Their superior performance makes them suitable for both industrial and structural applications.
- Oil & Gas Industry: Used in offshore platforms, subsea pipelines, and processing systems exposed to harsh conditions.
- Power Generation & Energy Sector: Ideal for high pressure systems, turbines, and energy production facilities.
- Chemical & Pharmaceutical Processing: Suitable for handling aggressive chemicals and maintaining high purity standards.
- Pulp & Paper Industry: Applied in bleaching plants and chemical processing units.
- Water Treatment & Wastewater Projects: Used in desalination plants and water management systems due to excellent corrosion resistance.
- Heat Exchangers & Fluid Handling Systems: Ensures reliable performance in high temperature and high pressure applications.
- Textile & Synthetic Fiber Industry: Used in machinery and processing equipment exposed to chemicals.
- Food & Dairy Processing Industry: Preferred for hygienic and corrosion resistant piping systems.
Export Markets
Kalpataru Piping Solution exports Super Duplex butt weld fittings to clients across the Middle East, Europe, Southeast Asia, Africa, and the Americas, including key markets such as the United Arab Emirates, Saudi Arabia, the United Kingdom, Singapore, and the United States. For a shipment quote to your region, contact our export team.
Frequently Asked Questions About Super Duplex Steel S32750 / S32760 Pipe Fittings
Super Duplex Steel S32750 and S32760 are high alloy stainless steels with a dual microstructure of austenite and ferrite. They offer excellent strength and superior resistance to corrosion, and are ideal for harsh and high pressure environments.
Both grades offer similar corrosion resistance and strength, but S32760 contains additional copper and tungsten for enhanced corrosion resistance in aggressive chloride and acidic environments. It is often preferred for the most demanding service conditions.
Yes. Due to their high yield strength and durability, Super Duplex fittings perform exceptionally well in high pressure and high temperature systems, and are widely used in critical industrial piping systems.
ASTM A182 covers forged fittings, including socket weld and threaded types, in Super Duplex grades F53 and F55. ASTM A815, the standard covering this page’s products, governs wrought buttweld fittings such as elbows, tees, and reducers. Both standards require solution annealing and quenching of the final product.
Yes, with appropriate precautions. Super Duplex fittings can be welded to 316L or other austenitic stainless steel piping using transition filler metals such as ER2594, though this creates a galvanic couple and the weld procedure should be qualified to ASME IX or ISO 15614 before use.