Super Duplex Steel S32750 seamless tubes are widely used in industries that demand exceptional corrosion resistance, high mechanical strength, and long-term durability under extreme environments. With a balanced microstructure of austenite and ferrite, this grade offers twice the strength of conventional stainless steels and superior resistance to pitting, crevice corrosion, and stress corrosion cracking. Because of these advanced properties, S32750 seamless tubes find applications in some of the most critical and demanding sectors.
Below are the major types of applications where these tubes are used:
1. Offshore and Marine Applications
Super Duplex S32750 seamless tubes are extensively used in offshore platforms, subsea equipment, heat exchangers, and piping systems. These environments expose materials to constant seawater contact, high salinity, and chloride-rich atmospheres. The alloy’s strong resistance to seawater-induced corrosion, biofouling, and erosion makes it ideal for marine conditions.
Common uses: risers, umbilicals, seawater cooling systems, fire-fighting systems.
2. Oil & Gas Industry (High-Pressure Systems)
Oil and gas extraction involves handling corrosive fluids such as Hâ‚‚S, COâ‚‚, and chlorides under high pressure. S32750 seamless tubes are used in wellhead equipment, flowlines, subsea pipelines, and injection systems because they can withstand extreme pressure while resisting corrosion cracking.
Common uses: offshore drilling, gas processing units, subsea manifolds, refinery piping.
3. Chemical and Petrochemical Processing
Chemical industries handle strong acids, alkalis, solvents, and aggressive chemicals. S32750 tubes are used in digesters, reactors, storage tanks, and chemical transfer lines, where both corrosion resistance and mechanical strength are crucial.
Common uses: processing of organic acids, desalination chemicals, and high-temperature corrosive fluids.
4. Desalination Plants
Desalination involves continuous exposure to seawater and brine, making corrosion resistance essential. S32750 seamless tubes are widely used in evaporators, high-pressure feed systems, brine heaters, and heat exchangers. Their ability to withstand chloride stress and pitting makes them suitable for long-term operation in desalination technology.
5. Pulp & Paper Industry
The pulp and paper industry uses chemicals such as sodium hydroxide, sodium sulfide, and bleaching agents that can rapidly degrade normal steels. S32750 tubes are used in digesters, bleach wash equipment, and black liquor processing units, where both corrosion resistance and resistance to cracking are required.
Common uses: bleaching towers, chemical recovery boilers, fiber processing lines.
6. Power Generation and Heat Exchangers
Super Duplex Steel S32750’s high thermal stability and strength make it an excellent choice for boilers, condensers, recuperators, and heat exchangers. In power plants—especially supercritical and ultra-supercritical units—materials must resist high temperatures and pressure fatigue, which S32750 handles effectively.
Common uses: heat transfer piping, thermal power cooling systems, boiler tubes.
7. Water Treatment and Wastewater Systems
Water treatment plants use disinfectants, chlorides, and chemicals that can corrode normal stainless steels. S32750 seamless tubes are used in membrane housings, filtration systems, pump components, and high-pressure RO piping due to their ability to withstand corrosive water conditions.
Common uses: sewage systems, RO plants, chlorinated water distribution.
8. Mining and Mineral Processing
Mining operations often involve abrasive slurries, acidic ores, and high-stress conditions. S32750 tubes are used in slurry transportation, extraction systems, and pressure pipelines, where erosion and corrosion resistance are essential.
Common uses: ore processing pipelines, chemical leaching systems.
9. Food and Beverage Industry (High-Sanitation Areas)
In some high-sanitation environments where cleaning chemicals and temperature variations are frequent, S32750 seamless tubes are used in heat exchangers, processing lines, and fluid transfer systems. Their smooth surface, cleanliness, and corrosion resistance help maintain hygiene standards.
Common uses: dairy processing heaters, brewing systems, CIP (clean-in-place) equipment.
Conclusion
Super Duplex Steel S32750 seamless tubes are designed for high-performance applications where conventional stainless steels fail. Their remarkable resistance to chloride attack, excellent mechanical strength, and stability under extreme conditions make them a preferred choice across offshore, petrochemical, power generation, and water treatment industries. Whether exposed to seawater, corrosive chemicals, or high-pressure environments, S32750 tubes offer long-term reliability, reduced maintenance, and improved operational safety.
