Metinox Overseas is the Super duplex stainless steel UNS S32760 pipes manufacturer and supplier to the projects around the USA, the Middle East and Africa in seamless and welded form as ASTM A790. The seawater and high chloride grade is S32760, which has a pitting resistance number greater than 40, and it is specified directly as S32760 or Zeron 100 in a project. This page sits within our duplex steel pipes range, and the closely related grade is on our super duplex S32750 pipes page.
Super duplex combines the strength of a duplex microstructure, about twice the yield of standard austenitic stainless, with the corrosion resistance that seawater, chlorinated cooling and aggressive acid service demand. We supply S32760 pipe from half an inch to 24 inch and above, with ferrite balance and PREN confirmed on the certificate. Send the size, schedule and quantity and the quote comes back with the mill certificates and regional approvals your project requires.
Table of Contents
- S32760 Pipe Specification
- ASME SA790 Super Duplex Steel S32760 Pipes Chemical Composition
- UNS S32760 Super Duplex Stainless Steel Seamless and Welded Pipe Mechanical Properties
- ASTM A790 Super Duplex Steel S32760 Pipes Equivalent Grades
- Size Chart of ASTM A790 Super Duplex F55 UNS S32760 Pipe
- Manufacturing Process of Super Duplex Steel UNS S32760 Pipes
- Industries & Applications of Super Duplex Steel UNS S32760 Pipes
- Why S32760: PREN, Copper & Tungsten
- S32760 vs S32750: Which Grade Do You Need?
- Applications Across the USA, Middle East & Africa
- Quality, Testing & Certification
- Frequently Asked Questions (FAQs)
S32760 Pipe Specification
| Property | Value |
|---|---|
| Grade | UNS S32760, Zeron 100, W. Nr. 1.4501 |
| Type | Super duplex, tungsten and copper bearing |
| PREN | 40 minimum (typically 41 or above) |
| Specifications | ASTM A790 (seamless/welded pipe), A928 (welded), A182 F55 for fittings/flanges |
| Forms | Seamless and welded pipe; see also super duplex tubes |
| Size range | NPS ½ inch to 24 inch and above |
| Certification | EN 10204 3.1 mill test certificate, ferrite & PREN, PMI, NACE MR0175 |
For tube requirements in the same grade see our super duplex steel tubes range; for the highest-integrity lines the stainless steel seamless pipes route applies here too.
Manufacturing Process of Super Duplex Steel UNS S32760 Pipes
Super Duplex Steel UNS S32760 pipes are made through modern technologies in order to make sure that they are of great strength, corrosion resistance, and reliability in severe service conditions. All manufacturing processes are closely observed to ensure that there is the right microstructure and that performance is uniform.
Seamless Pipe ProductionIt starts with high-quality alloy billets, which are heated, and holes are pierced in their middle to form hollow regions. These parts are then subjected to hot forming and finishing processes in order to obtain very tight tolerances, smooth finishes and great mechanical integrity.
Welded Pipe ManufacturingIn welded pipes, Super Duplex steel plates or coils are rolled to tubular surfaces and welded together by means of controlled welding. Optimization of the welding process is done so that the joint offers equal strength and corrosion resistance as the parent material.
Heat Treatment ProcessSolution annealing is done after forming or welding of the pipes. This heat technology increases toughness, eliminates remaining stresses, and increases pitting resistance and stress corrosion cracking resistance.
Inspection and Testing
The pipes are checked in terms of quality, such as dimensional checking, mechanical checking, and non-destructive testing, to check their adherence to the international standards.
Industries & Applications of Super Duplex Steel UNS S32760 Pipes
The pipes made of Super Duplex Steel, UNS S32760, are also widely spread in industries where high strength is needed to be high, along with the necessary corrosion resistance. The applications that are commonly used are as outlined below.
Oil & Gas Industry
They are widely used in offshore and onshore oil and gas projects in terms of flowlines, pipelines, and processing equipment, because they are able to overcome high pressure and corrosive media.
Chemical and Process Industries
UNS S32760 pipes are designed to incorporate aggressive chemical and high temperature fluids in processing plants, reactors, and piping systems.
Marine and Seawater Applications
These pipes are normally applied in marine structures, shipbuilding, and seawater intake systems because of their high ability to resist seawater corrosion.
Water Treatment Plants and Desalination
They are also used extensively in desalination plants, evaporators, and reverse osmosis systems due to their salty and brackish water resistance.
Pressure Equipment and Heat Exchangers
The pipes are used in heat exchangers and pressure vessels where high strength, durability, and resistance against corrosion are needed.
Why S32760: PREN, Copper & Tungsten
Super duplex is bought on its pitting resistance equivalent number, the PREN, calculated from chromium, molybdenum, nitrogen and, in S32760, tungsten. S32760 carries a minimum PREN of 40, with additions of tungsten and copper that lift its resistance in reducing acids and fast seawater beyond standard super duplex. That is why it is trusted in seawater cooling, desalination and sour oil and gas service, where a pitting or crevice failure is expensive and a grade below PREN 40 is marginal. The dual-phase structure also gives high strength, so thinner walls carry the same pressure, which offsets part of the higher price per kilo.
S32760 vs S32750: Which Grade Do You Need?
Both are super duplex above PREN 40 and both handle seawater, so the choice is usually driven by what the specification names. S32760, Zeron 100, adds tungsten and copper for extra margin in reducing acids and fast-flowing seawater and is often the named grade on offshore and desalination projects. S32750, 2507, is the widely stocked super duplex without the tungsten and copper, equally at home in most seawater and chloride service. Where a spec calls out one grade, supply that grade; where it is open, either works for most duty, and our super duplex S32750 pipes page covers the alternative. Tell us the spec and we confirm the grade.
Applications Across the USA, Middle East & Africa
S32760 goes into the harshest chloride and seawater service common to these regions: seawater cooling and firewater on Gulf and offshore platforms, desalination plant across the Middle East and North Africa, chemical and acid process lines, and sour oil and gas gathering. Its strength and corrosion margin suit the high-chloride, high-temperature conditions where standard stainless and even standard duplex fall short. It pairs with our duplex & super duplex flanges and the wider special alloys pipes & tubes range, supplied with the approvals and documentation these regions require.
Quality, Testing & Certification
Super duplex performance depends on a correct ferrite-austenite balance, so every S32760 pipe carries an EN 10204 3.1 mill test certificate with ferrite content and PREN reported, heat-number traceable, because an incorrect phase balance undermines both the strength and the corrosion resistance the grade is bought for. Positive material identification confirms the grade, and NACE MR0175 documentation for sour service and third-party witness through BV, SGS or TUV are arranged at order stage, in line with our quality policy. Pipe is marked and protected for export sea freight per our packing & dispatch standard. Send the size, schedule and quantity and the quote comes back with the certification built in.
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Super Duplex S32760 Pipes: Frequently Asked Questions
UNS S32760, known as Zeron 100, is a super duplex stainless steel pipe grade with a tungsten and copper-bearing chemistry and a minimum PREN of 40. Supplied to ASTM A790 in seamless and welded form, it combines about twice the strength of standard austenitic stainless with the corrosion resistance seawater, chloride and acid service demand. We supply it from half an inch to 24 inch and above.
Both are super duplex above PREN 40 and both handle seawater. S32760, Zeron 100, adds tungsten and copper for extra margin in reducing acids and fast seawater, and is often the named grade on offshore and desalination projects. S32750, 2507, is the widely stocked super duplex without those additions. Where a specification names one grade, supply that grade; for open specs either works for most duty.
S32760 has a minimum pitting resistance equivalent number of 40, typically 41 or above, calculated from its chromium, molybdenum, nitrogen and tungsten. A PREN above 40 is the threshold that qualifies a grade as super duplex and suitable for seawater, which is why S32760 is trusted in desalination, offshore cooling and high-chloride service where lower grades would pit.
ASTM A790 for seamless and welded super duplex pipe, A928 for welded pipe, with matching A182 F55 for fittings and flanges. Every pipe is supplied with ferrite balance and PREN reported on the mill certificate, positive material identification and NACE MR0175 documentation where the service requires it.
Yes. We manufacture and export S32760 super duplex pipe to projects across the USA, the Middle East and Africa, with EN 10204 3.1 mill certificates reporting ferrite and PREN, positive material identification, NACE documentation and export packing for sea freight. The grade suits the seawater, desalination and sour service common to these regions.
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