Duplex Steel Tubes | Duplex Steel Pipe Supplier & manufacturer

What is Duplex Stainless Steel?

Comprising almost equal amounts of solid and metallic stainless steel structures, duplex stainless steel is a very specific alloy. Duplex steel's special mix of mechanical strength, corrosion resistance, and fatigue resistance qualities above those of conventional stainless steels—comes from this dual-phase microstructure.

Duplex stainless steel is especially fit for usage in maritime situations and chemical exposure settings because of its resistance to chloride-induced corrosion. Along with improved resistance to localized corrosion, it gives about twice the strength of traditional austenitic grades.

Super Duplex Stainless Steel provides higher levels of chromium, molybdenum, and nitrogen for applications requiring even more performance, greatly improving its corrosion resistance especially in highly aggressive environments including offshore oil rigs, subsea pipelines, and high-salinity water treatment facilities.

Duplex Steel Pipes:

Duplex Steel Pipes offer high strength, durability, and exceptional corrosion resistance. Made from austenitic-ferritic stainless steel, they resist pitting and stress corrosion, making them ideal for oil & gas, marine, and chemical industries.

Duplex Steel Tubes:

Duplex Steel Pipes deliver superior strength, toughness, and corrosion resistance. Crafted from austenitic-ferritic stainless steel, they withstand high pressure, pitting, and stress corrosion perfect for use in oil & gas, marine, and chemical sectors.

Types Of Duplex Steel Tubes & Pipes

Duplex steel contains a high content of chromium and nitrogen that permits the alloy to maintain good weldability and to be immune to both corrosion and high-stress corrosion cracking. Duplex Stainless Steel Seamless Pipes are highly resistant to corrosion, have high resistance to intergranular corrosion. Even in chloride and sulfide environments, Duplex stainless steel Tubes exhibit very high resistance to stress corrosion cracking. The high chromium content of Duplex stainless steel that protects against corrosion causes embrittlement at temperatures over concerning 300 degrees C. At low temperatures duplex, stainless steels have higher malleability than the ferritic and martensitic grades. Duplex grades can promptly be used down to a minimum of -50 degree C.

Duplex stainless steel Pipes and Tubes are primarily used in Chemical processing, transport and storage, Oil and gas exploration and offshore rigs, Oil and gas refining, Marine environments, Pollution control equipment, Pulp & paper manufacturing, Chemical process plant, etc.

We offer these Duplex Steel Welded Pipes and Tubes along with numerous documents and test certificates so as to make sure the standard of our products and raw materials used the documents include a commercial invoice which includes HS code, packing list, fumigation Certificates, raw material test Reports, Material Traceability Records, Quality Assurance plan, etc.

Duplex Steel Tubes & Pipe Grades & Forms

To satisfy worldwide technical standards and sophisticated industrial needs, at Solitaire Overseas we proudly present a large range of Duplex and Super Duplex Steel Tubes & Pipes in several grades, sizes, and combinations.

Our array of products comprises:

A790 Duplex Stainless Steel Pipes ASTM
SA 789 Super Duplex Steel Tubes ASME
Perfectly welded and seamless duplex pipes
Duplex steel tubes, ERW (electric resistance welded)
Rectangular, square, and round duplex pipes

We provide hot-rolled and cold-drawn versions of these pipes to provide best flexibility depending on project requirements. Whether your operating need calls for custom-engineered dimensions—including non-standard diameters, wall thicknesses, or specified lengths—or conventional sizes—our staff provides tailored solutions to fit your particular need. Every good is produced precisely to ensure dependability, performance, and long-term service.

Specification of Duplex Steel Pipe & Tube

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

Duplex Steel Tubes & Pipes Chemical Composition

Our Duplex and Super Duplex Steel Tubes & Pipes guarantee top-notional performance in demanding, corrosive, and high-stress settings by being made from a well-balanced and well managed chemical composition. Typical chemical compositions consist of:

Chromium: 21–23 %
Nickel: 4.5–6.5%
2.5–3.5% molybdenum
nitrogen: 0.10 to 0.22 percent
Iron: Stability

Our pipes are quite fit for usage in seawater systems, chemical facilities, and offshore constructions since this special mix increases resistance against chloride-induced stress corrosion, acidic chemicals, and oxidizing agents. In settings where conventional stainless steels can fail, the best corrosion resistance and long-lasting performance depend on the optimum alloy design.

Mechanical Properties of Duplex Steel Tubes & Pipes

Designed to offer exceptional mechanical and physical qualities, duplex stainless steel pipes guarantee dependability and longevity in the most demanding industrial environments. Important features include:

Minimum Yield Strength: >450 MPa
Tensile strength more than 620 MPa
Long elongation: more than 25%
Hardness: 290 HB or below
Density: around 7.8 g/cm³

Duplex pipes are perfect for cyclic stress, high-temperature, high-pressure conditions because of these features. Particularly helpful in important installations requiring long-term stability and performance is their dimensional integrity, resistance to deformation, and great degree of fatigue strength.

Applications of Duplex & Super Duplex Pipes

Duplex and Super Duplex Steel Tubes & Pipes are extensively used in many different sectors because of their great mechanical strength, corrosion resistance, and lifetime.
Important uses are:

oil and gas transmission and flowlines.
offshore platforms and subsea tools
Pressure Vacuum Systems and Heat Exchangers
Chemical Processing Facilities and Petrochemical Plants
Pulp & Paper Manufacturing Systems
Plants of Desalination and Water Treatment
nuclear installations and power generation

In projects subjected to sulfide stress cracking, thermal cycling, and chloride-rich environments—where material integrity directly affects safety and efficiency—these pipes are extremely important. Their application improves general system dependability and helps to lower maintenance downtime.

Where to Buy Duplex Steel Tubes & Pipes?

Leading provider and worldwide exporter of Duplex and Super Duplex Steel Tubes & Pipes, Solitaire Overseas provides world-class goods and individualized service for over 70+ countries. Engineering companies, EPC contractors, and industrial customers all trust us for our:

solid export-grade packaging guaranteeing secure global shipping
Total material traceability with heat number tracking included
Third-party certifications from acknowledged inspection bodies
Customizing tools to fit challenging design criteria
simplified manufacturing plans with regular on-time delivery

Whether your needs call for precise pipes for marine engineering or bulk procurement for an oil pipeline, Solitaire Overseas assures the best degrees of quality, technical compliance, and customer satisfaction.