Yes, our super duplex stainless steel tubes are made to work in seawater. They can handle chloride-rich environments where standard austenitic grades like 316L would fail because they have a PREN of more than 40. Our S32750 grade has a Critical Pitting Temperature of about 85°C which makes it reliable in warm seawater systems.
Super Duplex Steel Tube Manufacturer in China
We produce durable Super duplex steel tubes at Xintongda Special Steel to handle extreme heat and corrosion. Our tubes are made from high-performance stainless steel. Since 1985, we have been a leading super duplex stainless steel tube manufacturer in Songyang, China, and a global supplier. Our tubes offer excellent corrosion resistance and strong mechanical strength. These tubes have a dual-phase structure, with approximately 40–60% ferrite and 40–60% austenite, typically targeting a balanced 50/50 ratio. This makes them stronger than standard stainless steels and improves resistance to chloride stress corrosion, pitting, and crevice corrosion. Our super duplex steel tubes are ideal for industries that need strong materials in tough environments
Our super duplex steel tubes are made according to ASTM A789 standards. Each of them is subjected to strict quality inspection before being shipped out. The adaptability and long lasting nature of these tubes make them a preferred tube for various industries such as marine engineering, oil and gas and chemical processing. We hold an Multiple International Certified and offer good prices to go along with our quality Super Duplex Tubes that are just right for various severe industries.
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OD Range
6 - 720 mm
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Thickness Range
1 - 65 mm
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Length
≤ 22 m
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What is a Super Duplex Stainless Steel Tube?
Super Duplex Stainless Steel Tube is a strong material that is made up of both austenitic and ferritic stainless steels. The unique dual-phase microstructure makes it resistant to pitting, crevice, and chloride stress corrosion cracking. This makes it perfect for use in harsh places like seawater systems and other places where corrosion is a big problem. Super duplex tubes are known for being strong and providing long-term service. They also perform reliably under high pressure at service temperatures up to approximately 250–300°C. The tubes are made with tight tolerances so that the wall thickness is always the same, the surface finishes are always smooth, and they always operate smoothly in all situations. Many industries use super duplex stainless steel tubes. They are essential when you need something that will last and function properly all the time. We have a variety of grades, such as UNS S32750, UNS S32760 (Zeron 100), and UNS S32550. This makes sure that our clients get the best materials for what they need.
Key Advantages of Super Duplex Stainless Steel Tube
Below are the 4 main key advantages of our super duplex stainless steel tube:
- Cost-Effectiveness: Super Duplex Stainless Steel Tubes offer excellent durability and performance at a competitive price, making them a cost-effective solution for industries needing high-performance materials without the high costs associated with other speciality metals.
- Good Toughness and Durability: The unique phase structure combining austenitic and ferritic phases gives good toughness and durability. This combination withstands high mechanical loads and resists stress corrosion cracking, which extends service life and reduces maintenance costs.
- Long Service Life: The strength and corrosion resistance of Super duplex stainless steel tubes ensure they last for many years, even in harsh environments, reducing the need for frequent replacements.
- Versatility: Super duplex tubes are available in various sizes and forms, offering excellent flexibility and adaptability across industries. Their wide range of applications makes them suitable for a multitude of critical and industrial uses.
Specification of Super Duplex Tube
The specifications of super duplex steel tubes are necessary for deciding if they are right for different uses. These tubes are precisely manufactured for reliable performance in harsh conditions, with multiple sizes, grades, and tolerances to suit project needs.
Standard
ASTM A789
Outside Diameters
6 - 720 mm
Length
≤ 22 m
Thickness Range
1 - 65 mm
Grades
S32750, S32760, S32550
Form
Round, Square, Rectangular, Hydraulic etc
End
Plain End, Beveled End, Threaded
Testing
PMI, Radiography, Mechanical, Chemical
Types and Shapes of Super Duplex Steel Tube
Our tubes are available in various forms and shapes; our precision manufacturing ensures high standards. You can choose from our products, which are designed to be of excellent quality and performance, whether it is a seamless hot or cold finished tube.
Super Duplex Steel Seamless Tube
Super Duplex Hot-Finished Tube
Super Duplex Cold-Finished Tube
Super Duplex Round Tube
Super Duplex Tube Grades
Super Duplex Stainless Steel Tubes are available in a variety of grades, each specifically designed to deliver optimum performance in various applications. Choosing the right grade requires evaluating the service environment, mechanical loading, and corrosion resistance requirements. The materials we have in stock of duplex types are S32550, S32760 and S32750. These three grades are reliable due to their distinct characteristics, and have been used in different areas.
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UNS S32550 Tube
The UNS S32550 tube (Ferralium 255) is a super duplex stainless steel grade known for its high toughness and resistance to stress cracking. Its enhanced durability makes it a reliable application where strength and reliability are critical. The UNS S32550 tube is a duplex stainless steel tube that can also endure harsh conditions thus are the main performer in the corresponding industries that require high resistance to stress, corrosion and wear. Hence, it is an ideal solution for the toughest conditions.
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UNS S32760 Tube
The UNS S32760 tube (Zeron® 100, Werkstoff Nr. 1.4501) is a super duplex grade containing additions of both tungsten (0.5–1.0%) and copper (0.5–1.0%) beyond the standard S32750 composition. These additions provide enhanced corrosion resistance in specific environments, particularly seawater desalination and aggressive chemical processing.
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UNS S32750 Tube
The UNS S32750 tube, also known as SAF 2507 (Werkstoff Nr. 1.4410), achieves a PREN of approximately 42 with its 24–26% Cr, 6–8% Ni, 3–5% Mo, and 0.24–0.32% N composition. We supply this grade for demanding chloride environments in oil and gas, chemical processing, and seawater systems. Its CPT of approximately 85°C (ASTM G48) makes it our most specified super duplex grade for heat exchanger service.
Super Duplex Stainless Tube Industries
Many industries use super duplex steel tubes because of their strong, long lasting and corrosion resistance. They perform reliably in high-pressure, high-temperature, and corrosive environments, making them better than conventional tubes in marine and chemical applications.
Marine Engineering
Our tubes are used for seawater systems and offshore applications because of their corrosion resistance in harsh saltwater environments
Oil and Gas
Super Duplex Steel Tubes are ideal for oil and gas applications like offshore rigs and pipelines, where high pressure and corrosion resistance are essential.
Chemical Processing
Chemical processing plants often use these tubes because they can corrode quickly when they come into contact with harsh chemicals. Super duplex tubes offer better protection which cuts down on downtime and maintenance costs.
Pulp and Chemical Containers
We supply our super duplex tubes for pulp and paper processing equipment including digesters, bleach washers, and black liquor systems, as well as for chemical storage vessels handling chloride-containing media.
Petrochemical Equipment
The petrochemical industry uses Super Duplex Steel Tubes because they can handle high pressure and temperature in corrosive environments.
Buy Super Duplex Tube from XINTONGDA
- Raw Materials Certificate
- 100% Positive Material Identification (PMI)
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular Corrosion, Pitting Corrosion, Grain size, Eddy Current (ET), Ultrasonic Testing (UT), Hydrostatic Testing (HT), etc.)
- Laboratory Test Certificate from Govt. Approved Lab
If you want to know more product details, please contact us!
Frequently Asked Questions
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Can Super Duplex SS Tube be used in seawater environments?
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How is a Super Duplex Tube different from a Duplex Tube?Super duplex tubes are better than duplex tubes. As super duplex tubes have more chromium, molybdenum, and nitrogen, making them stronger, durable and resistant to chloride stress corrosion, making them better for harsh conditions.
- What is a Super Duplex Stainless Steel Tube?
- Key Advantages of Super Duplex Stainless Steel Tube
- Specification of Super Duplex Tube
- Types and Shapes of Super Duplex Steel Tube
- Super Duplex Tube Grades
- Super Duplex Stainless Tube Industries
- Buy Super Duplex Tube from XINTONGDA
- Frequently Asked Questions