Manufacturer, Exporter and Supplier of Super Duplex Steel Pipes and Tubes in India
Amardeep Steel Centre is a leading manufacturer, supplier and exporter of super duplex steel pipes and tubes, operating from Mumbai, India, since 1984. Our super duplex pipe line is available in grades UNS S32750, UNS S32760 or UNS S32950 which is made according to ASTM A790, ASME SA790, ASTM A789 and ASME SA789 requirements. Whether you need super duplex tubing for offshore platforms, super duplex pipe for desalination systems, or custom-cut lengths for chemical processing plants, Amardeep Steel Centre has the inventory and technical expertise to fulfill your order at competitive
pricing. We currently export to over 80 countries and have all the major third party inspection certifications such as SGS, Bureau Veritas, Lloyds and TUV.
Super Duplex Steel Pipe Specification and Grade Overview
The table below outlines the complete super duplex pipe specification range supplied by Amardeep Steel Centre. Buyers can request mill test certificates, heat numbers, and third-party inspection reports for all orders.
| Parameter | Details |
| Standard | ASTM A790 / ASME SA790 (Pipe) | ASTM A789 / ASME SA789 (Tube) |
| Grade / UNS | UNS S32750 (2507) | UNS S32760 (Zeron 100) | UNS S32950 |
| Werkstoff No. | 1.4410 (S32750) | 1.4501 (S32760) |
| Type | Seamless | Welded | ERW | EFW | Fabricated |
| Outer Diameter | 6.35 mm to 914.4 mm (as per ANSI/ASME B36.19) |
| Wall Thickness | 0.5 mm to 50 mm (Schedule 5S to Schedule 160) |
| Length | Single Random (5 to 7 m) | Double Random (11 to 13 m) | Cut to Length |
| End Finish | Plain End | Bevelled End | Threaded End |
| Form | Round | Square | Rectangular | Coiled | U-Shape | Pancake Coil | Hydraulic Tube |
| Surface Finish | Annealed and Pickled | Electropolished | Bright Annealed |
| Testing | Hydrostatic | PMI | Ultrasonic | Radiographic | IGC | Pitting Resistance | Flattening | Flaring |
| Mill Certificates | EN 10204 3.1 | EN 10204 3.2 (on request) |
Chemical Composition of Super Duplex Stainless Steel Grades
The superior corrosion resistance and mechanical strength of super duplex stainless steel pipe results from precise alloying. The table below lists the chemical composition for the two most widely used grades.
UNS S32750 (SAF 2507) Chemical Composition
| Element | Min (%) | Max (%) |
| Chromium (Cr) | 24.0 | 26.0 |
| Nickel (Ni) | 6.0 | 8.0 |
| Molybdenum (Mo) | 3.0 | 5.0 |
| Nitrogen (N) | 0.24 | 0.32 |
| Carbon (C) | – | 0.030 |
| Manganese (Mn) | – | 1.20 |
| Silicon (Si) | – | 0.80 |
| Phosphorus (P) | – | 0.035 |
| Sulfur (S) | – | 0.020 |
UNS S32760 (Zeron 100) Chemical Composition
| Element | Min (%) | Max (%) |
| Chromium (Cr) | 24.0 | 26.0 |
| Nickel (Ni) | 6.0 | 8.0 |
| Molybdenum (Mo) | 3.0 | 4.0 |
| Tungsten (W) | 0.5 | 1.0 |
| Copper (Cu) | 0.5 | 1.0 |
| Nitrogen (N) | 0.20 | 0.30 |
| Carbon (C) | – | 0.030 |
| Manganese (Mn) | – | 1.00 |
Mechanical Properties of Super Duplex Steel Pipe
Super duplex stainless steel pipe offers nearly twice the yield strength of standard austenitic stainless steel grades such as 316L, allowing engineers to use thinner wall sections and reduce overall system weight without compromising structural performance.
| Property | UNS S32750 (2507) | UNS S32760 (Zeron 100) |
| Tensile Strength (min) | 795 MPa (115 ksi) | 750 MPa (109 ksi) |
| Yield Strength 0.2% Proof (min) | 550 MPa (80 ksi) | 550 MPa (80 ksi) |
| Elongation (min) | 15% | 25% |
| Hardness (max) | 32 HRC | 32 HRC |
| PREN (Pitting Resistance Equivalent) | Greater than 42 | Greater than 40 |
| Max Operating Temperature | 316°C (600°F) | 300°C (572°F) |
Super Duplex Pipe vs Duplex Pipe: Key Differences
Buyers frequently ask about the distinction between duplex and super duplex steel pipe when selecting materials for corrosive or high-pressure service. The comparison below clarifies the primary differentiators.
| Comparison Factor | Duplex (S31803 / S32205) | Super Duplex (S32750 / S32760) |
| Chromium Content | 21 to 23% | 24 to 26% |
| Molybdenum Content | 2.5 to 3.5% | 3.0 to 5.0% |
| PREN Value | 30 to 38 | 40 and above |
| Corrosion Resistance | Good in moderate chloride | Excellent in high chloride and seawater |
| Tensile Strength | Approx. 620 MPa | Approx. 795 MPa |
| Preferred Applications | Chemical plant, general piping | Offshore, desalination, subsea |
| Relative Cost | Moderate | Higher due to alloy content |
Types of Super Duplex Steel Pipes and Tubes Supplied
Super Duplex Seamless Pipes
Super duplex seamless pipes are manufactured from a solid billet using hot extrusion or piercing processes, resulting in a uniform wall thickness with no weld seam. These pipes are preferred for high-pressure and high-temperature applications where structural integrity is critical. Conforming to ASTM A790, our seamless super duplex pipes are stocked in standard schedule sizes from Schedule 5S to Schedule 160 in OD ranges from 6.35 mm to 323.8 mm.
Super Duplex Welded and ERW Pipes
Super duplex welded pipes are formed by rolling flat strip into a tubular shape and welding the longitudinal seam using TIG or plasma arc welding. Electric resistance welded (ERW) pipes are produced using high-frequency induction welding. Both welded and ERW super duplex pipe types undergo post-weld heat treatment and full radiographic inspection to ensure the weld zone meets the same mechanical and corrosion resistance standards as the parent material.
Super Duplex EFW and Fabricated Pipes
Electric fusion welded (EFW) pipes are produced by submerged arc or plasma welding processes and are suitable for large-diameter applications. Fabricated super duplex pipes are made to non-standard dimensions or configurations specified by the end user. Amardeep Steel Centre supplies both EFW and fabricated super duplex pipes for pressure vessel, heat exchanger, and structural applications.
Super Duplex Hydraulic Tubing and Coiled Tubes
Super duplex hydraulic tubes are precision-drawn to tight OD and wall thickness tolerances for use in high-pressure instrumentation, hydraulic control lines, and heat exchanger tubing. Coiled tubes, pancake coils, and U-shaped tubes are also available for heat transfer and condensation applications in offshore and power generation environments.
Super Duplex Steel Pipe Dimensions and Approximate Weight Chart
The table below provides indicative weights for super duplex steel seamless pipes in common schedule designations. Actual weights may vary based on material grade and manufacturing tolerances. Contact our technical team for exact weight calculations and certified mill reports.
| NPS (inches) | OD (mm) | Schedule 10S WT (mm) | Schedule 40S WT (mm) | Schedule 80S WT (mm) | Approx Wt SCH40S (kg/m) |
| 1/2 | 21.3 | 1.65 | 2.77 | 3.73 | 1.27 |
| 3/4 | 26.7 | 1.65 | 2.87 | 3.91 | 1.69 |
| 1 | 33.4 | 1.65 | 3.38 | 4.55 | 2.50 |
| 1.5 | 48.3 | 1.65 | 3.68 | 5.08 | 4.05 |
| 2 | 60.3 | 1.65 | 3.91 | 5.54 | 5.44 |
| 3 | 88.9 | 2.11 | 5.49 | 7.62 | 11.29 |
| 4 | 114.3 | 2.11 | 6.02 | 8.56 | 16.07 |
| 6 | 168.3 | 2.77 | 7.11 | 10.97 | 27.79 |
| 8 | 219.1 | 2.77 | 8.18 | 12.70 | 43.80 |
| 10 | 273.0 | 3.40 | 9.27 | 12.70 | 61.60 |
| 12 | 323.8 | 3.96 | 9.53 | 12.70 | 76.60 |
Industries and Applications for Super Duplex Steel Pipe
Super duplex stainless steel pipe is specified wherever corrosive environments, high mechanical loads, and extended service life requirements converge. Amardeep Steel Centre regularly supplies super duplex pipe and tubing to the following sectors.
Oil and Gas Industry: Offshore production platforms, subsea flowlines, topside piping, seawater injection systems, and process pipework in oil refineries require materials that resist chloride-induced stress corrosion cracking. Super duplex pipe in UNS S32750 and S32760 grades is the benchmark material for these critical applications.
Desalination Plants: Multi-stage flash (MSF) and reverse osmosis (RO) desalination systems subject piping to continuous contact with high-salinity seawater. Super duplex steel tubing withstands this environment without pitting or erosion degradation over decades of operation.
Chemical and Petrochemical Processing: Reactors, heat exchangers, pressure vessels, and transfer lines handling sulfuric acid, hydrochloric acid, chlorinated organics, and high-temperature brine solutions rely on super duplex pipe specification compliance with ASTM A790 and stringent mechanical property requirements.
Power Generation: Flue gas desulfurization (FGD) systems, condensers, and cooling water circuits in thermal and nuclear power plants use super duplex stainless steel pipe for its ability to handle both high temperatures and corrosive media simultaneously.
Marine and Shipbuilding: Seawater cooling systems, ballast water treatment pipework, and deck piping aboard commercial vessels and naval ships are specified in super duplex tubing to prevent biofouling-accelerated corrosion in saltwater service.
Fertilizer and Pharmaceutical Plants: Urea synthesis loops, ammonia lines, and corrosive chemical feed systems in fertilizer manufacturing, as well as high-purity process lines in pharmaceutical production, use super duplex pipe for its combination of chemical resistance and high-pressure handling capacity.
Pulp and Paper Industry: Digesters, bleaching circuits, and effluent handling systems in pulp mills expose piping to hot sulfurous and chloride-bearing liquors. Super duplex steel pipes withstand these environments far better than standard austenitic grades.
Super Duplex Steel Pipe and Tube Range by Grade
Amardeep Steel Centre stocks and supplies the following sub-categories under the super duplex pipe range. Click on each sub-category for full specifications, chemical compositions, and stock availability.
- Super Duplex Steel UNS S32750 and S32760 Pipes and Tubes
- Super Duplex Steel UNS S32950 Pipes and Tubes
Super Duplex Pipe Manufacturing Process and Quality Testing
Amardeep Steel Centre sources raw material only from certified mills and subjects every lot to a multi-stage quality control process before dispatch. Our manufacturing and inspection approach ensures that every super duplex steel pipe and tube delivered meets or exceeds the declared specification.
Raw Material Inspection
All incoming raw material is subjected to spectrometric analysis (PMI testing) to verify chemical composition against the declared heat certificate. Material is accepted only when it conforms fully to the UNS grade requirements.
Pipe Manufacturing and Heat Treatment
Seamless pipes undergo hot extrusion followed by solution annealing at temperatures above 1040 degrees C to dissolve intermetallic phases and restore a balanced austenite-ferrite microstructure. Welded pipes are TIG or plasma arc welded, then solution annealed, pickled, and passivated. All pipes are water-quenched after annealing to lock in the duplex microstructure.
Testing and Inspection
Each super duplex pipe batch undergoes the following tests before certification and dispatch.
- Hydrostatic pressure testing per ASTM A530
- Ultrasonic testing (UT) per ASTM A789 / A790
- Radiographic examination (RT) for weld integrity
- Positive material identification (PMI) using X-ray fluorescence
- Intergranular corrosion (IGC) test per ASTM A262
- Pitting resistance test (ASTM G48 Method A or E)
- Hardness testing (Rockwell or Brinell)
- Flattening test for welded pipes
- Flaring test for tubes
- Dimensional inspection including OD, wall thickness, straightness, and ovality
Certifications and Third-Party Inspection
Amardeep Steel Centre holds the following certifications and approvals relevant to super duplex steel pipes and tubes. Test reports are provided per EN 10204 3.1 as standard, with 3.2 reports available via third-party inspection agencies.
- ISO 9001:2015 Quality Management System
- PED (Pressure Equipment Directive) compliance for European exports
- NACE MR0175 / ISO 15156 compliance for sour service applications
- Third-party inspection by SGS, Bureau Veritas, TUV, Lloyds, and Intertek
- AD 2000 WO approval for German market projects
Related Products
- Super Duplex Steel Plates, Sheets and Coils
- Super Duplex Steel Bars, Rods and Wires
- Super Duplex Steel Forged Fittings
- Super Duplex Steel Flanges
- Super Duplex Steel Buttweld Fittings
- Super Duplex Steel Fasteners
Frequently Asked Questions About Super Duplex Steel Pipes and Tubes
What grades of super duplex steel pipes does Amardeep Steel supply?
Amardeep Steel Centre supplies super duplex steel pipes and tubes in UNS S32750 (SAF 2507), UNS S32760 (Zeron 100), and UNS S32950 grades. All grades are produced per ASTM A790 for pipe and ASTM A789 for tubes, with available DIN equivalent 1.4410 and 1.4501 designations for European projects.
What is the difference between duplex and super duplex steel pipe?
Super duplex steel pipe contains higher chromium (24 to 26 percent), molybdenum (3 to 5 percent), and nitrogen than standard duplex, resulting in a pitting resistance equivalent number (PREN) above 40. This gives super duplex pipe superior resistance to chloride pitting, crevice corrosion, and stress corrosion cracking, making it the material of choice for seawater systems, offshore applications, and highly corrosive chemical service.
What standards are used for super duplex pipe manufacturing?
Super duplex pipes at Amardeep Steel Centre are manufactured per ASTM A790 and ASME SA790 for seamless and welded pipe, and per ASTM A789 and ASME SA789 for tubing. Dimensional standards follow ANSI/ASME B36.19. Additional standards applicable include NACE MR0175 for sour service and PED for European pressure equipment applications.
What temperature range can super duplex steel pipe handle?
Super duplex steel pipe in UNS S32750 grade is typically limited to a maximum service temperature of 316 degrees C (600 degrees F). Extended exposure above this temperature can cause precipitation of embrittling intermetallic phases, which reduces both toughness and corrosion resistance. For cryogenic or low-temperature service, super duplex maintains good toughness down to approximately minus 50 degrees C.
Does Amardeep Steel offer super duplex pipes in non-standard sizes?
Yes. Amardeep Steel Centre supplies super duplex pipes in custom outer diameters, wall thicknesses, and lengths to meet project-specific requirements. Custom fabricated pipes, large-diameter EFW pipes, and precision hydraulic tubing in special sizes are available on request with lead times communicated at the time of inquiry.
Do you export super duplex steel pipes internationally?
Amardeep Steel Centre has been exporting super duplex steel pipes and tubes to more than 80 countries since 1984. Key export destinations include the UAE, Saudi Arabia, Qatar, Oman, USA, UK, Germany, Netherlands, Singapore, Australia, Canada, South Africa, and Nigeria. All export orders are supported with full documentation including MTCs, packing lists, and country-of-origin certificates.
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