Super Duplex Steel S32760 pipe is a seamless pipe made from UNS S32760 alloy. It is a high-strength stainless steel that has a 50% ferrite and 50% austenite structure. This makes it resistant to corrosion in tough places like oil and gas and seawater.
ASTM A790 Super Duplex Steel UNS S32760 Seamless Pipe Manufacturer
We are Zhejiang Xintongda Special Steel (XTD), a trusted China-based manufacturer and global supplier of high-performance Super duplex seamless UNS S32760 pipe. This alloy is a high-performance super duplex stainless steel also known as Zeron 100. This SDSS pipe contains chromium (24.0–26.0%), nickel (6.0–8.0%), molybdenum (3.0–4.0%), nitrogen (0.20–0.30%), with controlled additions of copper (0.5–1.0%) and tungsten (0.5–1.0%). We manufacture this pipe in strict compliance with ASTM A790 standards. Its balanced microstructure includes 50% austenite and 50% ferrite, which delivers a PREN value exceeding 41 for exceptional resistance to pitting and stress corrosion cracking. This makes it a preferred choice for chloride-rich environments due to its superior corrosion resistance and much higher strength than 316 grade. This super duplex S32760 pipe is important for desalinating seawater, processing chemicals and marine engineering. We have an annual supply capacity of 25,000 tons and hold multiple international certifications. We make sure that orders are delivered quickly, within one week for stock orders, so that you can meet the most important project deadlines and strict technical requirements worldwide.
Our pipes meet the following specifications:
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Standard ASTM A790 -
OD Range 6-720 mm -
Thickness 1-65 mm -
Length ≤ 18 m
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Technical Data
Technical Data
How are Super Duplex S32760 Seamless Pipes made?
As a leading seamless pipe manufacturer in China, we start the production of this pipe by heating a high-quality steel billet and then piercing it to make a hollow shell. Advanced processes like cold rolling or cold drawing are performed to get the precise dimensions and a smooth finish. The final steps of the manufacturing process include solution annealing and quenching. This ensures the pipe achieves high strength and corrosion resistance. The detailed manufacturing process of seamless pipe is covered here.
What are the Key Properties of ASTM A790 UNS S32760 Pipe?
Super duplex stainless steel S32760 pipe has 6 key characteristics:
- High Chromium Content: This pipe contains approximately 25% chromium. It forms a stable, protective oxide layer on the surface that protects the metal underneath from damage by oxygen and chemicals.
- Pitting Resistance: This SDSS pipe has a PREN value exceeding 41. This material effectively resists localised holes or "pits" caused by salt and chemicals. This property is important for ensuring the pipe stays leak-proof in harsh marine conditions.
- Resistance to Crevice Corrosion: The pipe is designed to resist corrosion in tight spaces or under gaskets where liquids can stay stagnant. For optimal performance, continuous service should be limited to temperatures between -50°C and 300°C (572°F). However, prolonged exposure to 600–1000°C can lead to sigma phase precipitation. This can reduce toughness and corrosion resistance.
- High Corrosion Resistance: The pipe’s corrosion resistance is primarily due to its high chromium, molybdenum, and nitrogen content, while controlled additions of copper and tungsten provide additional resistance in specific acidic and chloride-rich environments. It performs much better than standard stainless steels when exposed to highly aggressive fluids.
- High Strength: This super duplex 32760 pipe is nearly twice as strong as standard austenitic grades like 316. This high yield strength allows the use of thinner pipe walls. This reduces the overall weight and cost of the system.
- Good Impact Toughness: The balanced duplex structure provides the pipe the ability to absorb energy and resist cracking under pressure. Even at sub-zero temperatures the material stays tough and reliable without becoming fragile.
Equivalent Grade Designation for Super Duplex Steel S32760 Pipes
Super duplex steel S32760 is also known globally as UNS S32760, Werkstoff Nr. 1.4501, Zeron 100, and EN X2CrNiMoCuWN 25-7-4.
| GRADE | UNS | GB | JIS | ISO | DIN/EN | GOST | |
| ISC | NEW | ||||||
| Super Duplex Steel 32760 | S32760 | — | — | — | X2CrNiMoCuWN25-7-4 | 1.4501 | — |
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface Roughness and Size Measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain size, ET, UT, HT)
- Laboratory Test Certificate from the Government-Approved Lab
What are the industrial applications of UNS S32760 seamless super duplex steel pipes?
S32760 super duplex stainless steel seamless (SMLS) pipes combine the desirable aspects of both a 50% austenite and 50% ferrite. This makes them a versatile choice across 6 industries:
Oil & Gas Industry
This pipe is used for subsea pipelines and flowlines that carry sour gas and crude oil. It endures the high pressure and corrosive elements found deep under the ocean floor.
Chemical Processing Equipment
In chemical plants, this SMLS pipe transports hot organic acids and chloride-rich solutions safely. Its durability reduces the need for frequent repairs in systems that handle highly reactive substances.
Marine Engineering
This pipe is used for seawater piping, firewater lines, and cooling systems exposed to constant seawater. The material prevents the rapid rusting that typically destroys lower-grade steels in salty air.
Seawater Desalination Plants
The S32760 super duplex pipe is essential for high-pressure reverse osmosis systems that turn salt water into drinking water. It resists the intense salt concentrations that would normally cause standard pipes to fail quickly.
Power Generation
This pipe is used in flue gas desulfurization systems to scrub pollutants from exhaust. It handles the corrosive "scrubber" liquids that are created during the air cleaning process.
Pulp & Paper
The paper industry uses this pipe in bleach washers and digesters where harsh chemicals are present. It provides a long service life in environments that involve high temperatures and aggressive bleaching agents.
Frequently Asked Questions
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What is Super duplex steel S32760 pipe?
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Can SDSS S32760 pipe be used in sour gas environments?Yes, S32760 pipe can handle sulfide stress cracking and H2S in sour gas as it resists sulfide stress cracking (SSC), qualified per NACE MR0175 / ISO 15156. Its PREN >41 provides additional resistance to chloride-induced pitting in sour service conditions.
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What is the role of nitrogen in S32760?Nitrogen in S32760 enhances pitting resistance, strengthens austenite, improves ductility, and works with chromium and molybdenum to improve overall corrosion resistance.
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What are the main alloying elements in S32760 pipe?The main alloying elements of S32760 pipe are chromium (24-26%), nickel (6-8%), molybdenum (3-4%), and nitrogen (0.20–0.30%) with low carbon (<0.03%) for pitting resistance and strength.
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What mechanical strength does S32760 seamless pipe provide?S32760 seamless pipes provide a minimum yield strength of 550 MPa, tensile strength of 750-900 MPa, 25% elongation, and hardness under 28 HRC for high-pressure use.
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How does S32760 differ from S32750 Pipe?S32760 differs from S32750 pipe because it contains additional copper, tungsten, and slightly different molybdenum and nitrogen balancing. This results in better pitting resistance (PREN >41 for both, with S32760 offering an edge in reducing acids) and improved performance in more aggressive corrosive environments.
- How are Super Duplex S32760 Seamless Pipes made?
- What are the Key Properties of ASTM A790 UNS S32760 Pipe?
- Equivalent Grade Designation for Super Duplex Steel S32760 Pipes
- 100% Certified Testing & Documentation
- What are the industrial applications of UNS S32760 seamless super duplex steel pipes?
- Frequently Asked Questions