Manufacturer of Duplex and Super Duplex Steel Pipes and Tubes

XINTONGDA SPECIAL STEEL

Duplex(Super Duplex) Stainless Steel Pipe And Tube

Zhejiang Xintongda Special Steel Manufacturing Co.,Ltd is a leading manufacturer of Duplex, Super Duplex and Hyper Duplex stainless steel seamless tube and pipe more 30years. We provide one of the world’s most extensive stocks of seamless tube and pipe ready for delivery to your next project. (Zhejiang Xintongda already become one of the biggest stockiest of Duplex steel and Super Duplex Steel tubes and pipes)
In addition, our technical department and metallurgists are prepared to help you with advice and guidance.
The products include: seamless duplex steel tube, seamless tube (31803,32205.. .) and super duplex steel tube,( 32750,32760…) and Hyper duplex steel (33207..), seamless duplex steel pipe(31803,32205 ...) and super duplex steel pipe,( 32750,32760…) and Hyper duplex steel pipe (33207...), which are used the following industries:

Chemical and Petrochemical Equipment
Commonly used in heat exchanger piping, storage tanks, pump bodies, and other components. Its combination of high strength and corrosion resistance makes it particularly suitable for environments containing chlorides.
1,Marine Engineering
Widely used in shipbuilding, offshore platforms, and desalination equipment, it withstands seawater corrosion and extreme climatic conditions.
2,Construction and Bridge Engineering
Some high-rise buildings and bridges utilize duplex steel, leveraging its high strength and corrosion resistance to reduce material thickness and lower costs.
3,Pulp and Chemical Containers
Commonly used in equipment such as pulp digesters and large storage tanks, it withstands high temperatures and strong acid/alkali corrosion.
4,Pipelines and Mechanical Components
Suitable for industrial piping systems, mechanical transmission components, and prestressed steel, offering both strength and toughness.
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S32205 Seamless Duplex Steel Pipe

S32205 Seamless Duplex Steel Pipe, also known as Duplex 2205, is a nitrogen-enhanced duplex stainless steel that offers a superior combination of high strength and excellent corrosion resistance. Seamless pipes and tubes made from this material are widely used in various demanding industrial applications where standard austenitic stainless steels are inadequate. Its balanced chemical composition and microstructure provide a desirable set of properties that make it a cost-effective solution for many corrosive environments,known for their excellent mechanical strength and durability in demanding environments.
①　STANDARD: ASTM A789/ ASTM A790/ ASTM A928/ ...

②　OD RANGE : 6-720 MM

③　THICKNESS RANGE: 1-65 MM

Seamless S32205 Duplex Steel Tube

Seamless S32205 Duplex Steel Tube, also known as Duplex 2205, is a nitrogen-enhanced duplex stainless steel that offers a superior combination of high strength and excellent corrosion resistance. Seamless pipes and tubes made from this material are widely used in various demanding industrial applications where standard austenitic stainless steels are inadequate. Its balanced chemical composition and microstructure provide a desirable set of properties that make it a cost-effective solution for many corrosive environments,known for their excellent mechanical strength and durability in demanding environments.
①　STANDARD: ASTM A789/ ASTM A790/ ASTM A928/ ...

②　OD RANGE : 6-720 MM

③　THICKNESS RANGE: 1-65 MM

UNS S32750 Seamless Super Duplex Steel Pipe

UNS S32750 seamless super duplex steel pipe is a high-performance tubing solution engineered for demanding environments where exceptional strength and corrosion resistance are critical. This grade of steel, often referred to by the trade name 2507, boasts a balanced microstructure of austenite and ferrite, providing a superior combination of properties compared to standard duplex or austenitic stainless steels.
UNS S32750 seamless super duplex steel pipe is a high-performance tubing solution engineered for demanding environments where exceptional strength and corrosion resistance are critical. This grade of steel, often referred to by the trade name 2507, boasts a balanced microstructure of austenite and ferrite, providing a superior combination of properties compared to standard duplex or austenitic stainless steels.

①　STANDARD: ASTM A789/ ASTM A790/ ASTM A928/ ...

②　OD RANGE : 6-720 MM

③　THICKNESS RANGE: 1-65 MM

UNS S32750 Seamless Super Duplex Steel Tube

UNS S32750 Seamless Super Duplex Steel Tube is a high-performance tubing solution engineered for demanding environments where exceptional strength and corrosion resistance are critical. This grade of steel, often referred to by the trade name 2507, boasts a balanced microstructure of austenite and ferrite, providing a superior combination of properties compared to standard duplex or austenitic stainless steels.
UNS S32750 seamless super duplex steel pipe is a high-performance tubing solution engineered for demanding environments where exceptional strength and corrosion resistance are critical. This grade of steel, often referred to by the trade name 2507, boasts a balanced microstructure of austenite and ferrite, providing a superior combination of properties compared to standard duplex or austenitic stainless steels.

①　STANDARD: ASTM A789/ ASTM A790/ ASTM A928/ ...

②　OD RANGE : 6-720 MM

③　THICKNESS RANGE: 1-65 MM

UNS S32760 Seamless Super Duplex Steel Pipe

UNS S32760 Seamless Super Duplex Steel Pipe , UNS S32760 is a high-performance super duplex stainless steel highly regarded for its exceptional strength and outstanding corrosion resistance, particularly in aggressive, chloride-containing environments. Seamless pipes made from this material are engineered for critical applications where reliability and longevity are paramount.
UNS S32760's primary advantage is its excellent resistance to various forms of corrosion.
• Pitting and Crevice Corrosion: This grade boasts a high Pitting Resistance Equivalent Number (PREN), calculated as PREN = %Cr + 3.3(%Mo + 0.5%W) + 16%N. With a PREN value typically exceeding 41, it offers outstanding resistance to localized corrosion in seawater and other chloride-rich media.
• Stress Corrosion Cracking (SCC): The duplex structure provides excellent resistance to chloride-induced SCC, a common vulnerability for standard austenitic stainless steels.
• Sour Service: It is resistant to sulfide stress cracking in sour gas environments, making it suitable for oil and gas applications.

①　STANDARD: ASTM A789/ ASTM A790/ ASTM A928/ ...

②　OD RANGE : 6-720 MM

③　THICKNESS RANGE: 1-65 MM

UNS S32760 Seamless Super Duplex Steel Tube

UNS S32760 Seamless Super Duplex Steel Tube, UNS S32760 is a high-performance super duplex stainless steel highly regarded for its exceptional strength and outstanding corrosion resistance, particularly in aggressive, chloride-containing environments. Seamless pipes made from this material are engineered for critical applications where reliability and longevity are paramount.
UNS S32760's primary advantage is its excellent resistance to various forms of corrosion.
• Pitting and Crevice Corrosion: This grade boasts a high Pitting Resistance Equivalent Number (PREN), calculated as PREN = %Cr + 3.3(%Mo + 0.5%W) + 16%N. With a PREN value typically exceeding 41, it offers outstanding resistance to localized corrosion in seawater and other chloride-rich media.
• Stress Corrosion Cracking (SCC): The duplex structure provides excellent resistance to chloride-induced SCC, a common vulnerability for standard austenitic stainless steels.
• Sour Service: It is resistant to sulfide stress cracking in sour gas environments, making it suitable for oil and gas applications.

①　STANDARD: ASTM A789/ ASTM A790/ ASTM A928/ ...

②　OD RANGE : 6-720 MM

③　THICKNESS RANGE: 1-65 MM

UNS32550 Seamless Super Duplex Steel Pipe

UNS32550 Seamless Super Duplex Steel Pipe , from UNS S32550 are produced via hot extrusion or cold drawing.UNS S32550 is a high-performance super duplex stainless steel known for its exceptional mechanical strength and excellent resistance to corrosion, particularly in aggressive industrial environments. Often referred to by brand names like Ferralium® 255, this alloy's seamless pipes are designed for demanding applications where standard stainless steels would fail.

①　STANDARD: ASTM A789/ ASTM A790/ ASTM A928/ ...

②　OD RANGE : 6-720 MM

③　THICKNESS RANGE: 1-65 MM

UNS S33207/3207/1.4658 Seamless Hyper Duplex Steel Pipe

UNS S33207 Seamless Hyper Duplex Steel Pipe designed for exceptional strength, corrosion resistance, and toughness, especially in highly aggressive environments. As a seamless pipe, it offers superior structural integrity and uniform properties across the cross-section.
Manufacturing Process: Seamless (hot finished / cold drawn)

Standards: ASTM A790 / ASME SA790, NORSOK MDS, ISO, EN equivalents

Size Range: ½” to 24” OD (or custom sizes on request)

Schedules: SCH 10 – SCH XXS

UNS S33207/3207/1.4658 Seamless Hyper Duplex Steel Tube

UNS S33207 Seamless Hyper Duplex Steel Tube designed for exceptional strength, corrosion resistance, and toughness, especially in highly aggressive environments. As a seamless pipe, it offers superior structural integrity and uniform properties across the cross-section.
Manufacturing Process: Seamless (hot finished / cold drawn)

Standards: ASTM A789 / ASME SA789, NORSOK MDS, ISO, EN equivalents

Size Range: ½” to 10” OD (or custom sizes on request)

UNS S32304/Duplex Alloy 2304/1.4362 Seamless Duplex Steel Pipe

UNS S32304 Seamless Duplex Steel Pipe，UNS S32304 also called Duplex 2304 or 1.4362 is a lean duplex stainless steel with a balanced austenite + ferrite microstructure. It provides higher strength than 304/316 austenitic stainless steels while maintaining good resistance to general corrosion, pitting, and stress corrosion cracking—at a more cost-effective alloying content.
As a seamless pipe, it delivers excellent uniformity, pressure resistance, and mechanical integrity.

Standards: ASTM A789 / ASTM A790, ASME SA789 / SA790, EN 10216-5

Manufacturing Process: Seamless (hot finished / cold drawn)

Size Range: ½” to 24” OD (custom sizes on request)

Schedules: SCH 10 – SCH XXS

UNS S31803/1.4462 Seamless Duplex Steel Pipe

UNS S31803 seamless duplex steel pipe, also known as Duplex 2205, is a high-strength, corrosion-resistant pipe with a dual-phase microstructure of austenitic and ferritic stainless steel. It offers excellent resistance to stress corrosion cracking, pitting, and crevice corrosion, particularly in chloride-rich environments like seawater.
Standards: ASTM A790 / ASME SA790, ASTM A789 / ASME SA789