Duplex Stainless Steel Pipe Suppliers

Seamless and Welded Ferrite/Austenitic Stainless Steel Tube for General Use ASTM A790(ASME SA790)

Seamless and Welded Ferrite/Austenitic Stainless Steel Nominal Tube ASTM A928

The standard for Filler Metal Electric-fusion-welded Ferrite/Austenitic (Duplex) Stainless Steel Tube

Product Description of Duplex Seamless Stainless Steel Pipe

Huaxiao Stainless Steel Pipe Suppliers


The Duplex Seamless Stainless Steel Pipe is a premium quality tubular product known for its exceptional strength, corrosion resistance, and versatility. It is made from a duplex stainless steel alloy, which combines the desirable properties of both austenitic and ferritic stainless steels, resulting in a highly durable and reliable pipe.

When sourcing Duplex Seamless Stainless Steel Pipe, it is crucial to partner with reputable stainless steel pipe suppliers. Huaxiao stainless steel pipe suppliers ensure the highest quality standards, comply with industry specifications, and offer customized solutions to meet specific project requirements. Their expertise and support ensure the seamless integration of the pipe into your applications, providing long-lasting performance and reliability.

Choose Duplex Seamless Stainless Steel Pipe for its exceptional corrosion resistance, high strength, and versatility, and elevate your piping systems to new levels of durability and performance.

Specification of Duplex Seamless Stainless Steel Pipe

Huaxiao Stainless Steel Pipe Suppliers

Production Standard: ASTM A789(ASME SA789)

Seamless and Welded Ferrite/Austenitic Stainless Steel Tube for General Use ASTM A790(ASME SA790)

Seamless and Welded Ferrite/Austenitic Stainless Steel Nominal Tube ASTM A928

The standard for Filler Metal Electric-fusion-welded Ferrite/Austenitic (Duplex) Stainless Steel Tube

Production Range

Normal Pipe Size

Outside DiameterNormal Wall Thickness (mm)

NPS

in

BN

mm

SCH5s

SCH10s

SCH40s

SCH80s

1/8

0.405

6

10.3

1.24

1.73

2.41

1/4

0.540

8

13.7

1.65

2.24

3.02

3/8

0.675

10

17.1

1.65

2.31

3.2

1/2

0.840

15

21.3

1.65

2.11

2.77

3.73

3/4

1.050

20

26.7

1.65

2.11

2.87

3.91

1

1.315

25

33.4

1.65

2.77

3.38

4.55

1 1/4

1.660

32

42.2

1.65

2.77

3.56

4.85

1 1/2

1.900

40

48.3

1.65

2.77

3.68

5.08

2

2.375

50

60.3

1.65

2.77

3.91

5.54

2 1/2

2.875

65

73.0

2.11

3.05

5.16

7.01

3

3.500

80

88.9

2.11

3.05

5.49

7.62

3 1/2

4.000

90

101.6

2.11

3.05

5.74

8.08

4

4.500

100

114.3

2.11

3.05

6.02

8.56

5

5.563

125

141.3

2.77

3.4

6.55

9.53

6

6.625

150

168.3

2.77

3.4

7.11

10.97

8

8.625

200

219.1

2.77

3.76

8.18

12.7

10

10.750

250

273.1

3.4

4.19

9.27

12.7

12

12.750

300

323.9

3.96

4.57

9.53

12.7

14

14.000

350

355.6

3.96

4.78

9.53

16

16.000

400

406.4

4.19

4.78

9.53

18

18.000

450

457.2

4.19

4.78

9.53

20

20.000

500

508.0

4.78

5.54

9.53

22

22.000

550

558.8

4.78

5.54

24

24.000

600

609.6

5.54

6.35

9.53

26

26.000

650

660.4

28

28.000

700

711.2

30

30.000

750

762.0

6.35

7.92

32

32.000

800

812.8

7.92

34

34.000

850

863.6

7.92

36

36.000

900

914.4

7.92

38

38.000

950

965.2

40

40.000

1000

1016.0

9.53

If you need more sizes, please consult with us

Main grade chemical component in different standard

2507

C %

Si %

Mn %

P %

S %

Ni %

Cr %

Mo %

N %

Cu %

ASTM

0.03

0.08

2.00

0.04

0.02

6.0-8.0

24 0-26 0

3.0-5.0

0.24-0.32

0.5

DIN/EN

0,03

1,00

2,00

0,035

0,015

6,0-8,0

24,0-26,0

3,0-4,5

0,24-0,35

JIS

GB

0.03

0.08

1.20

0.04

0.02

6.0-8.0

24.0-26.0

3.0-5.0

0.24-0.32

0.5

2205

C %

Si %

Mn %

P %

S %

Ni %

Cr %

Mo %

N %

Cu %

ASTM

0.03

1.00

2.00

0.030

0.020

4.5-6.5

22.0-23.0

3.0-3.5

0.14-0.20

DIN/EN

JIS

GB

0.03

1.00

2.00

0.03

0.02

4.5-6.5

22.0-23.0

3.0-3.5

0.14-0.20

S31803

C %

Si %

Mn %

P %

S %

Ni %

Cr %

Mo %

N %

Cu %

ASTM

0.03

1.00

2.00

0.030

0.020

4.5-6.5

21.0-23.0

2.5-3.5

0.08-0.20

DIN/EN

0,03

1,00

2,00

0,035

0,015

4,5-6,5

21,0-23,0

2,5-3,5

0,10-0,22

JIS

0.03

1.00

2.00

0.040

0.030

4.5-6.5

21.0-24.0

2.5-3.5

0.08-0.20

GB

0.03

1.00

2.00

0.030

0.020

4.5-6.5

21.0-23.0

2.5-3.5

0.08-0.20

Main grade mechanical property in different standard

2507

Y.S./Mpa ≥

T.S./Mpa ≥

E.L./% ≥

HB ≤

HRC ≤

HBW ≤

HV ≤

ASTM

550

795

15

32

310

JIS

GB

550

795

15

32

310

2205

Y.S./Mpa ≥

T.S./Mpa ≥

E.L./% ≥

HB ≤

HRC ≤

HBW ≤

HV ≤

ASTM

450

655

25

31

293

JIS

GB

450

620

25

31

293

S31803

Y.S./Mpa ≥

T.S./Mpa ≥

E.L./% ≥

HB ≤

HRC ≤

HBW ≤

HV ≤

ASTM

420

620

25

31

293

JIS

450

620

18

32

302

320

GB

450

620

25

31

293

Features of Duplex Seamless Stainless Steel Pipe

Huaxiao Stainless Steel Pipe Suppliers

Duplex Seamless Stainless Steel Pipe exhibits exceptional resistance to corrosion, making it highly suitable for challenging environments. It resists corrosion from various chemicals, including chlorides, sulfides, and acids, as well as stress corrosion cracking and pitting. This ensures long-term durability and reliability in corrosive applications, such as offshore platforms, chemical processing plants, and marine environments.

Duplex Seamless Stainless Steel Pipe offers excellent mechanical strength, combining the benefits of both austenitic and ferritic stainless steels. It has higher yield and tensile strength compared to conventional stainless steel grades, allowing it to withstand heavy loads and high-pressure environments. This high strength makes it suitable for structural applications, such as construction, oil and gas pipelines, and pressure vessels, where superior strength is required for optimal performance and safety.

Duplex Seamless Stainless Steel Pipe is known for its exceptional durability and reliability. It exhibits excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, making it highly suitable for harsh and corrosive environments. Its unique microstructure provides enhanced resistance to various forms of corrosion, ensuring a long service life and reduced maintenance requirements. The superior durability of duplex stainless steel pipe makes it a preferred choice for critical applications in industries such as offshore oil and gas, chemical processing, and marine environments, where reliability and longevity are paramount. Additionally, its robustness and reliability contribute to cost savings by minimizing the need for frequent repairs or replacements.

Duplex Seamless Stainless Steel Pipe offers excellent value for money due to its combination of superior properties and competitive pricing. While duplex stainless steel pipes may have a higher initial cost compared to some other materials, their long-term cost-effectiveness becomes evident through their extended service life and low maintenance requirements. The high corrosion resistance and durability of duplex stainless steel minimize the need for frequent repairs or replacements, resulting in reduced downtime and lower overall operating costs. Additionally, the high strength of duplex stainless steel allows for thinner pipe walls, leading to material savings without compromising on performance. This makes duplex stainless steel pipe a cost-effective choice for various applications, especially in industries such as chemical processing, oil and gas, and desalination, where reliability and longevity are essential, and operational efficiency is a priority. By choosing duplex seamless stainless steel pipe, customers can achieve optimal performance, durability, and cost savings over the long term.

Duplex Seamless Stainless Steel Pipe offers the advantage of seamless integration into various systems and applications. The seamless manufacturing process ensures smooth and continuous pipe surfaces, eliminating the need for additional welding or joining methods. This seamless integration enhances the overall performance and reliability of the system by reducing the risk of leakage and improving fluid flow. The seamless nature of the pipe also provides enhanced structural integrity, ensuring optimal strength and durability in demanding environments. Whether it is for high-pressure fluid transportation, offshore installations, or critical industrial processes, the seamless integration of duplex seamless stainless steel pipe ensures efficient and reliable operation. The seamless design also offers aesthetic appeal, providing a clean and professional look in architectural and decorative applications. With its ability to seamlessly integrate into diverse systems, duplex seamless stainless steel pipe provides a versatile and adaptable solution for a wide range of industries and applications.

Features of Duplex Seamless Stainless Steel Pipe

Huaxiao Stainless Steel Pipe Suppliers
offshore platforms

Oil and gas industry

Duplex seamless stainless steel pipe is widely used in the oil and gas industry for applications such as offshore platforms, subsea pipelines, and processing facilities. It's superior corrosion resistance and high strength make it suitable for handling aggressive fluids and withstanding harsh environments.

chemical processing plants

Chemical and petrochemical industry

The excellent resistance to corrosion and stress corrosion cracking makes duplex seamless stainless steel pipe an ideal choice for chemical processing plants, refineries, and petrochemical facilities. It is used for transporting corrosive chemicals, acids, and high-temperature fluids.

boilers

Power generation

Duplex seamless stainless steel pipe is utilized in power plants for applications including heat exchangers, boilers, and steam piping systems. Its resistance to corrosion and high-temperature environments makes it suitable for the demanding conditions of power generation.

seawater intake

Desalination plants

Duplex seamless stainless steel pipe is utilized in power plants for applications including heat exchangers, boilers, and steam piping systems. Its resistance to corrosion and high-temperature environments makes it suitable for the demanding conditions of power generation.

food processing

Pharmaceutical and food processing

The hygienic properties of duplex seamless stainless steel pipe make it suitable for applications in pharmaceutical and food processing industries. It is used for conveying sterile fluids, process piping, and storage tanks where cleanliness and purity are critical.

architectural structures

Architectural and decorative applications

Duplex seamless stainless steel pipe is utilized in architectural structures, interior design elements, and decorative applications. Its aesthetic appeal, durability, and resistance to corrosion make it an excellent choice for creating visually appealing and long-lasting designs.

mineral processing operations

Mining and mineral processing

The corrosion resistance and durability of duplex seamless stainless steel pipe make it suitable for mining and mineral processing operations, where it is used for transporting corrosive fluids and handling abrasive materials.

FAQ

Huaxiao Stainless Steel Pipe Suppliers

The main difference between duplex seamless stainless steel pipe and other types of stainless steel pipe lies in the composition and microstructure. Duplex stainless steel is a two-phase material consisting of both austenite and ferrite phases, offering a combination of excellent corrosion resistance and high strength. Compared to other stainless steel grades, duplex stainless steel pipe has superior resistance to stress corrosion cracking, pitting, and crevice corrosion. It also exhibits higher mechanical strength, making it suitable for demanding applications where strength and corrosion resistance are crucial. Additionally, duplex seamless stainless steel pipe offers enhanced weldability and formability, allowing for easier fabrication and installation. Overall, the unique duplex structure and properties of the seamless stainless steel pipe make it a preferred choice in industries such as oil and gas, chemical processing, marine, and offshore applications where durability and corrosion resistance are paramount.

Duplex seamless stainless steel pipe is typically manufactured through a process called hot extrusion or rotary piercing. Here is a brief overview of the manufacturing process:

  • Raw Material Selection: High-quality duplex stainless steel billets or ingots are carefully selected based on their chemical composition and mechanical properties.
  • Heating: The selected billets are heated to the appropriate temperature in a controlled environment, typically using induction or electric resistance heating.
  • Piercing/Extrusion: The heated billet is pierced or extruded using a mandrel or piercing tool to create a hollow tube. This process can be performed using various techniques such as rotary piercing or hot extrusion.
  • Sizing and Finishing: The initial tube is then passed through a series of sizing rolls or a sizing machine to achieve the desired dimensions and surface finish. Additional processes like straightening, heat treatment, and pickling may be performed to improve the quality of the pipe.
  • Cold Working (Optional): In some cases, the pipe may undergo cold working processes such as cold drawing or cold pilgering to further enhance its dimensional accuracy and mechanical properties.
  • Final Inspection and Testing: The finished duplex seamless stainless steel pipe undergoes rigorous inspection and testing to ensure it meets the required standards and specifications. This may include non-destructive testing (e.g., ultrasonic testing) and dimensional inspections.
  • Packaging and Delivery: The pipes are carefully packaged to protect them during transportation and delivered to customers or distributors.

Overall, the manufacturing process for duplex seamless stainless steel pipe involves several steps to ensure the highest quality and performance of the final product. It combines precision, heat treatment, and stringent quality control measures to meet the specific requirements of various industries and applications.

Yes, duplex seamless stainless steel pipe can be welded, but it requires careful consideration and proper welding techniques. The duplex stainless steel material has a dual-phase microstructure, consisting of both austenite and ferrite phases, which provides its unique properties.

When welding duplex stainless steel pipe, it is important to maintain a balanced heat input and control the intermetallic phase formation to avoid detrimental effects on the corrosion resistance and mechanical properties of the material. Preheating and post-weld heat treatment may be necessary in certain cases to reduce the risk of cracking and improve the overall weld quality.

To ensure successful welding, it is recommended to use filler metals specifically designed for duplex stainless steels. These filler metals typically have a balanced composition to match the duplex microstructure and provide adequate corrosion resistance.

Additionally, proper welding procedures, such as controlling the heat input, maintaining suitable interpass temperatures, and using appropriate shielding gases, should be followed to minimize the risk of weld defects and achieve sound welds.

It is advisable to consult with experienced welding professionals or refer to welding guidelines and specifications provided by the stainless steel pipe suppliers or industry standards when working with duplex seamless stainless steel pipe to ensure proper welding practices are followed for optimal results.

Duplex seamless stainless steel pipe can be certified to various quality standards to ensure its compliance with industry requirements. Some of the commonly recognized certifications for duplex stainless steel pipe include:

  • ASTM A790/A790M: This specification covers seamless and welded duplex stainless steel pipe for general corrosive service and high-temperature applications. Compliance with this standard ensures the material meets specific chemical composition, mechanical properties, and testing requirements.
  • EN 10216-5: This European standard specifies the technical delivery conditions for seamless stainless steel tubes, including those made from duplex stainless steel. It covers dimensions, tolerances, and mechanical properties of the pipes.
  • NORSOK MDS D45: This certification is specific to the offshore oil and gas industry and sets requirements for duplex stainless steel pipes used in harsh environments. It ensures the material meets stringent criteria for corrosion resistance, mechanical properties, and welding suitability.
  • PED 2014/68/EU: The Pressure Equipment Directive is a mandatory certification for pressure equipment, including pipes, within the European Union. Compliance with this directive ensures that the duplex stainless steel pipe meets safety, design, and manufacturing standards.
  • ISO 9001: This certification demonstrates that the manufacturer has implemented a quality management system and follows consistent processes to ensure the reliability and quality of their products, including duplex seamless stainless steel pipes.

It is important to note that the availability of specific certifications may vary depending on the manufacturer and the intended application of the duplex seamless stainless steel pipe. Buyers should verify the certifications offered by the supplier and ensure they meet their project requirements and industry standards.

Duplex stainless steel offers higher strength compared to many other stainless steel grades. It combines the desirable characteristics of both austenitic and ferritic stainless steels, resulting in a material with superior mechanical properties.

In terms of yield strength, duplex stainless steel generally exhibits higher values than austenitic stainless steels such as 304 and 316. The yield strength of duplex stainless steel can range from 450 to 620 MPa (65,000 to 90,000 psi), depending on the specific grade.

Similarly, duplex stainless steel typically has higher tensile strength compared to austenitic stainless steels. The tensile strength of duplex stainless steel can range from 620 to 880 MPa (90,000 to 130,000 psi), again depending on the grade.

The higher strength of duplex stainless steel makes it suitable for applications where greater structural integrity and resistance to mechanical stress are required. It allows for the use of thinner walls in piping systems, reducing weight and cost while maintaining durability and performance.

However, it is important to note that the strength of duplex stainless steel can vary depending on the specific alloy composition and heat treatment. Different duplex grades may have different strength levels, so it is essential to consult the technical specifications and data sheets provided by the manufacturer to determine the exact strength characteristics of a particular duplex stainless steel grade.

While duplex seamless stainless steel pipe offers excellent performance in a wide range of applications, there are certain limitations and restrictions to consider.

One limitation is the potential for embrittlement at elevated temperatures. Duplex stainless steel can experience reduced toughness and ductility when exposed to temperatures above a certain threshold, typically around 300 to 400°C (572 to 752°F). This can affect its mechanical properties and may require careful consideration in high-temperature applications.

In addition, duplex stainless steel is susceptible to stress corrosion cracking (SCC) in certain environments. Chloride-containing environments, such as seawater or chloride-rich solutions, can pose a risk for SCC. Therefore, it is important to assess the compatibility of duplex stainless steel with specific environments and take appropriate measures, such as selecting the correct grade or implementing corrosion prevention strategies.

Furthermore, duplex stainless steel may not be suitable for applications requiring extremely low temperatures, as it can experience reduced toughness in cryogenic conditions. It is important to verify the suitability of duplex stainless steel for such applications and consider alternative materials if necessary.

Overall, while duplex seamless stainless steel pipe offers excellent corrosion resistance, high strength, and durability, it is essential to assess the specific operating conditions, environmental factors, and application requirements to ensure its suitability and mitigate any potential limitations or restrictions. Consulting with stainless steel experts and following industry standards and guidelines is recommended to make informed decisions regarding the use of duplex stainless steel pipe in different applications.

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