Super Duplex Stainless Steel | Duplex Steel pipes

What is a Super Duplex Steel Pipe?

A Super Duplex steel pipe is a high-performance stainless steel pipe that combines superior strength with excellent resistance to corrosion, particularly in aggressive environments. It has a mixed microstructure of austenite and ferrite and contains higher levels of chromium, molybdenum, and nitrogen compared to standard duplex steel. This enhances its durability and makes it ideal for demanding applications in industries such as offshore oil and gas, petrochemicals, and marine engineering, where resistance to pitting, crevice corrosion, and stress corrosion cracking is critical.

Super Duplex Steel Pipes

Super Duplex steel pipes are robust and corrosion-resistant pipes known for their high strength and excellent performance in harsh environments. With a balanced microstructure of austenite and ferrite, these pipes offer superior resistance to chloride-induced stress corrosion, making them ideal for offshore, marine, and chemical processing industries. Their durability and long service life make them a preferred choice for critical applications under extreme pressure and temperature conditions.

Super Duplex Steel Tubes

Super Duplex steel tubes are high-performance tubing solutions designed for use in highly corrosive and high-pressure environments. Featuring a mixed microstructure of austenite and ferrite, these tubes provide exceptional strength, excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. They are commonly used in oil and gas, chemical processing, desalination, and marine applications where reliability and durability are crucial.

Duplex Steel Pipes and Tubes – Trusted Manufacturer & Global Exporter

Solitaire overseas is an eminent manufacturer, exporter, and distributor of Super Duplex Steel Pipes and Tubes manufactured using high quality raw materials and modern technology in accordance with the globally approved quality standards. Super Duplex Steel Pipes & Tubes exhibit features like Excellent resistance to stress corrosion cracking (SCC) in chloride-bearing environments, Excellent resistance to pitting and crevice corrosion, High resistance to general corrosion, Very high mechanical strength, Physical properties that offer design advantages, High resistance to erosion corrosion and corrosion fatigue, Good weldability, etc. Our Super Duplex Steel Seamless Pipes are used in a wide variety of applications like Oil and gas industry equipment, Offshore platforms, heat exchangers, process and service water systems, fire-fighting systems, injection and ballast water systems, Chemical process industries, Desalination plants, high pressure RO plants and seawater piping, etc.

Specification of Duplex Steel Pipes and Tubes

Specification

Specifications

ASTM A789, A790 / ASME SA789, SA790

Dimensions

ASTM, ASME and API

Seamless Pipe Size

1/2" NB - 8" NB

Welded Pipe Size

6" NB - 24" NB

Outer Diameter :

6.0-630mm

Thickness :

0.3mm – 50 mm

Length

Single Random, Double Random & Required Length

Schedule

SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH120, SCH140, SCH160, XXS

Type

Seamless, Welded, ERW, EFW

Form

Round Pipes, Square Pipes, Rectangular Pipe

End

Plain End, Beveled End, Treaded

Super Duplex Steel Chemical Composition

Super Duplex Steel consists of approximately:

Chromium	24–26%
Nickel	6–8%
Molybdenum	3–5%
Nitrogen	0.2–0.3%
Iron	Balance

This chemical composition offers increased pitting resistance and enhanced strength, making it more durable than standard stainless steels.

UNS S32950 Super Duplex Tubes

UNS S32950 Super Duplex Tubes meets industry needs for seamless, weldable ferritic/austenitic stainless steel tubes. They have great resistance to even the most corrosive environments, including those soaked with chlorides, for use in heat exchangers, condensers, pressure vessels, and other high performance applications. UNS S32750 Super Duplex tubes can be relied upon to resist high pressures and temperatures as well as those punishing conditions that structures in the oil and gas, marine, and power generating industries are likely to encounter. Their tensile strength is far higher than that of the ordinary austenitic and ferritic stainless steels.

Mechanical & Physical Properties

Excellent mechanical and physical characteristics of Super Duplex Steel make it ideal for demanding industrial use. Its yield strength is about 550 MPa; its tensile strength reaches upward of 800 MPa. Those figures are outstanding in the context of steel, not only decent. Its ductility and load-bearing capacity rank nearly highest among all types of steel. Super Duplex is still a top choice for uses that demand an uncommon combination of very high strengths and great corrosion resistance even with a minimum elongation of 25% which isn't all that much. This material runs wonderfully between 50°C and 300°C.

Applications of Duplex Steel Pipes

Industries needing very high strength and exceptional corrosion resistance find great use for duplex steel pipes. Particularly in offshore platforms, risers, and subsea pipes systems that must withstand severe environmental conditions, they are ideal for usage in the oil and gas industry. In the chemical processing sector, they fit reactors, heat exchangers, and pipework systems handling a broad spectrum of harsh compounds. They are sufficiently resistant to seawater corrosion that desalination plants use them. Duplex steel finds application in boiler tubes and heat recovery systems in power generating plants. Furthermore, the maritime sector makes use of it in ballast water systems and shipbuilding where long term performance is very vital.

Why Choose Solitaire Overseas for Super Duplex Pipes & Tubes?

Solitaire Overseas is a trusted name in the industry, offering ASME SA 789 certified Super Duplex Pipes and Tubes that meet the highest standards of performance and reliability. With a wide range of sizes, custom manufacturing options, and strict ISO-certified quality control processes, we ensure products that deliver exceptional strength and corrosion resistance. Our efficient global shipping network and proven export record guarantee fast delivery and safe packaging, making us the preferred supplier for clients worldwide.

How to Select the Right Super Duplex Product?

Selecting the correct Super Duplex product requires evaluating your application environment that of marine, chemical, or oil and gas processing. Compliance with pertinent standards (e.g., UNS S32950), the operating pressure and temperature, and exposure to corrosive media (such as acids or chlorides) are critical elements to take under account. Also important for this selection process is the choice of appropriate pipe size, wall thickness, and length much of which is dictated by the particular application. Correct application of these several options increases the long term efficiency, safety, and maintenance free performance much more likely.

FAQ

What is the difference between Duplex and Super Duplex Steel?

Super Duplex Steel contains higher amounts of chromium, nickel, and molybdenum compared to standard Duplex, providing greater strength and corrosion resistance.

What are ASME SA 789 Tubes used for?

These tubes are used in pressure vessels, condensers, and heat exchangers in industries like petrochemicals and power generation.

Are Super Duplex Pipes suitable for seawater applications?

Yes, due to their excellent pitting and crevice corrosion resistance, they are ideal for marine and offshore environments.

Can I order customized Duplex Stainless Steel Pipe dimensions?

Yes, Solitaire Overseas offers custom thickness, diameter, and length options based on your project needs.

What certifications do these pipes and tubes carry?

Products are compliant with ASME SA 789 and backed by ISO, IBR, NACE, and third-party inspection certifications.