Duplex Steel Seamless Pipes Manufacturer and Supplier in Thailand
Duplex steel seamless pipe is hollow cylindrical pipe manufactured without a weld, providing a uniform structure throughout. Thaida Stainless Steel Manufacturing (Thailand) Co., Ltd., based in Chon Buri, is a trusted manufacturer of high-quality duplex steel seamless pipes. We follow quality standards in our manufacturing process to deliver superior products. Our duplex steel seamless pipes, including grades like Duplex Steel UNS S31803 and UNS S32205, offer exceptional corrosion resistance and high strength which make them ideal for use in aggressive environments. These pipes are available in various sizes and specifications. Our DSS seamless pipe material ensures excellent performance in critical applications, including high-pressure systems and structural frameworks.
Product Overview: Duplex Stainless Steel Seamless Pipes
Duplex Stainless Steel Seamless Pipes are engineered for exceptional performance in tough working conditions. The term “duplex” refers to the combination of austenitic and ferritic stainless steel, which gives these pipes a unique blend of strength and corrosion resistance. Known for their ability to withstand high pressure and rust resistance, it is ideal for applications in chemical processing, oil and gas, marine, and power generation industries. These pipes are available in custom lengths and sizes, with varying wall thicknesses and precise dimensions to meet specific requirements.
Key characteristics and benefits of Duplex Seamless Pipes
The benefits of duplex steel seamless pipes include excellent corrosion resistance, durability, weldability and more for industrial use.
Dual-phase microstructure
High Strength
Excellent Corrosion Resistance
It is highly resistant to various forms of corrosion, including pitting, crevice, and stress corrosion cracking. This makes it an excellent choice for industries exposed to aggressive environments.
Good Weldability
Despite their strength, it offer good weldability, allowing for easy joining in both field and shop applications. Proper welding techniques ensure strong, reliable seams that maintain the material’s inherent corrosion resistance.
High Toughness
Duplex Steel’s high toughness allows it to absorb impact and withstand tough working conditions without compromising its integrity. This makes it suitable for applications that demand both high strength and the ability to endure physical stress.
Why Choose Our Duplex Steel Seamless Pipes?
We are the trusted manufacturer and supplier of high-quality Duplex Steel Seamless Pipes, offering exceptional performance and reliability for a wide range of industrial applications. Our pipes are crafted to meet international standards, ensuring superior strength, excellent corrosion resistance, and high durability. With options for custom lengths, sizes, and wall thicknesses, we provide tailored solutions to meet specific project requirements, making our Duplex Steel pipes the ideal choice for tough working conditions.
Competitive Pricing
Global Exports Expertise
Large Inventory & Fast Delivery
Custom Sizes & Special Orders
Industry Certifications & Compliance
Premium Materials & Strict Quality Control
After-Sales Support & Service
In-House Testing & Full Traceability
Duplex Steel Seamless Pipes Specification
Below is the specification of Duplex Steel Seamless Pipes, outlining key details such as material grades, dimensions, wall thicknesses, and other essential characteristics to meet diverse industrial requirements.
| Specifications | ASTM A790 / ASME SA790 |
|---|---|
| Dimensions | ASTM, ASME and API |
| Size Range | 1/2" NB – 24" NB (Seamless) |
| Schedule | SCH10, SCH20, SCH40, SCH60, SCH80, SCH120, SCH140, SCH160, XS, XXS |
| Type | Seamless Duplex Steel Pipes |
| Grades | UNS S31803, S32205, S32750, S32760 |
| Form | Round, Square, Rectangular, Hydraulic Etc |
| Length | Single Random, Double Random & Cut Length |
| End | Plain End, Beveled End, Threaded |
Duplex Steel Seamless Pipes sizes
Duplex steel tube size chart provides a detailed list of available sizes, OD, and schedules to meet specific project requirements.
| Size (NB) | Outside Diameter (inches) | Available Schedules |
|---|---|---|
| 1/8" | 0.405" | SCH 40, 80 |
| 1/4" | 0.540" | SCH 40, 80 |
| 3/8" | 0.675" | SCH 40, 80 |
| 1/2" | 0.840" | SCH 10, 40, 80, 160, XXS |
| 3/4" | 1.050" | SCH 10, 40, 80, 160, XXS |
| 1" | 1.315" | SCH 10, 40, 80, 160, XXS |
| 1 1/4" | 1.660" | SCH 10, 40, 80, 160, XXS |
| 1 1/2" | 1.900" | SCH 10, 40, 80, 160, XXS |
| 2" | 2.375" | SCH 10, 40, 80, 160, XXS |
| 2 1/2" | 2.875" | SCH 10, 40, 80, 160, XXS |
| 3" | 3.500" | SCH 10, 40, 80, 160, XXS |
| 4" | 4.500" | SCH 10, 40, 80, 160, XXS |
| 6" | 6.625" | SCH 10, 40, 80, 160, XXS |
| 8" | 8.625" | SCH 10, 40, 80, 160, XXS |
Types of Duplex Steel Seamless Pipes
Duplex steel seamless pipes types such as cold drawn, square, round and more are mentioned below.
At Thaida, we only provide high-quality Duplex Steel Seamless Pipes.
Duplex Steel Seamless Pipes
These are the standard duplex steel pipes that offer excellent strength and corrosion resistance, suitable for high-pressure and aggressive environments. Their dual-phase microstructure combines ferritic and austenitic properties, providing superior mechanical performance.
Duplex Steel Cold Drawn Seamless Pipes
Cold drawn duplex steel seamless pipes are precision-processed for tighter tolerances and enhanced surface finish. The cold drawing process improves the pipe's strength and dimensional accuracy, making it ideal for applications requiring high durability and close-fitting parts.
Duplex Steel Round Seamless Pipes
Round duplex steel seamless pipes are versatile and commonly used in a variety of industrial applications. Their uniform circular shape provides excellent strength and reliability, making it perfect for use in high-pressure and high-temperature environments.
Duplex Steel Square Seamless Pipes
Square duplex steel seamless pipes offer the same excellent corrosion resistance and strength as round pipes, but with a square profile. These pipes are often used in structural applications where a square shape is required for ease of installation or design.
Duplex Steel Rectangle Seamless Pipes
Rectangular duplex steel seamless pipes are designed for specific applications that require a flat, elongated shape. These pipes are used where space constraints or specialized designs demand non-circular profiles while still providing superior mechanical and corrosion resistance properties.
Duplex Steel Seamless Pipes Manufacturing Process
Following are the 5 steps involved in the duplex steel seamless pipe manufacturing process to achieve high-quality output. Each step plays a crucial role in transforming raw materials into finished products that meet industry standards.
1. Raw Material Selection
The process begins with selecting high-quality raw materials, typically in the form of billets or ingots, which are carefully chosen for their alloy composition and suitability for duplex steel pipes.
2. Heating
The raw material is heated in a furnace to a high temperature, making it soft and malleable for the next stages of production, ensuring ease of further processing.
3. Piercing
Once heated, the billet undergoes a piercing process to create a hollow center, forming the pipe’s initial shape. This step is essential for creating the basic hollow structure of the pipe.
4. Rolling / Elongation
The pierced billet is then passed through rollers to elongate the pipe, gradually forming it into the desired diameter and thickness. This step helps refine the pipe’s shape and size.
5. Sizing / Reducing
The pipe is further reduced to the desired dimensions, ensuring it meets specific size requirements and has uniform wall thickness throughout.
6. Heat Treatment
The pipe undergoes heat treatment to enhance its mechanical properties, such as strength, toughness, and resistance to corrosion, ensuring the final product meets industry standards.
7. Pickling & Descaling
After heat treatment, the pipe is cleaned to remove any scale or oxides that form during heating. This step ensures a clean surface and enhances the pipe’s corrosion resistance.
8. Straightening
The pipe is straightened to ensure it is free from any distortions or bends, ensuring uniformity and suitability for use in applications where straightness is critical.
9. Testing & Inspection
Rigorous testing and inspection are conducted, including checks for dimensional accuracy, pressure testing, and material properties, to guarantee the pipe meets all required specifications.
10. Marking & Packaging
Finally, each pipe is marked with relevant details such as the grade, dimensions, and manufacturer’s mark. The pipes are then carefully packaged to prevent damage during transportation and handling.
Applications of Duplex Steel Seamless Pipes
Duplex steel seamless pipes are widely used in offshore oil and gas platforms for transporting corrosive fluids under high pressure. Their strength and corrosion resistance make them ideal for subsea pipelines, risers, and topside processing units in marine environments. Apart from offshore applications, these pipes are also utilized in chemical processing plants, desalination units, and pulp & paper industries for handling aggressive fluids.
Oil and Gas Industry
Marine Applications
Chemical Industry
Petrochemical Industry
Power Plants
Aerospace & Defense
Automotive and Transportation
Desalination Plants
Pulp and Paper Industry
FAQ's
How are Duplex Steel Seamless Pipes different from austenitic or ferritic stainless steel?
How are Duplex Steel Seamless Pipes different from austenitic or ferritic stainless steel?
Duplex steel pipes differ from austenitic and ferritic stainless steels due to their dual-phase microstructure of roughly equal parts austenite and ferrite, which gives them superior strength and corrosion resistance, particularly in chloride-rich environments. These pipes provide higher yield and tensile strength than both austenitic and ferritic grades, with improved resistance to stress corrosion cracking, though slightly lower ductility than austenitic steels. Duplex steels also exhibit moderate magnetic properties, more than austenitic but less than ferritic types, and are widely used in demanding industries such as oil and gas, chemical processing, and marine applications.
What industries commonly use Duplex Steel Seamless Pipes?
What industries commonly use Duplex Steel Seamless Pipes?
Duplex steel seamless pipes are widely used across industries such as oil and gas, chemical processing, power generation, marine, desalination, pulp and paper, and food and pharmaceutical processing. Due to its exceptional strength and corrosion resistance, they are ideal for offshore platforms, refineries, power plants, and seawater systems exposed to high pressure, temperature, or corrosive environments. These pipes are also valued for their durability and hygiene, ensuring reliable performance in both industrial and sanitary applications.
How strong are Duplex Steel Seamless Pipes compared to 304 or 316 stainless steel?
How strong are Duplex Steel Seamless Pipes compared to 304 or 316 stainless steel?
Duplex steel pipes offer about twice the yield strength of 304 and 316 stainless steels, with a 0.2% proof strength of about 450–550 MPa, compared to 205 MPa for 316 and 280 MPa for 304. This superior strength comes from their dual austenitic-ferritic microstructure enriched with molybdenum and nitrogen. Duplex steels also deliver exceptional resistance to pitting and stress corrosion cracking in chloride environments, whereas 316 shows moderate resistance, and 304 remains the most vulnerable to corrosion.
Can Thaida provide customized Duplex Steel Seamless Pipes?
Can Thaida provide customized Duplex Steel Seamless Pipes?
Yes, Thaida can provide customized Duplex Steel Seamless Pipes based on specific project requirements. The company offers customization in terms of size, thickness, length, and surface finish to meet different industrial standards and applications. Thaida ensures precision manufacturing and strict quality control to deliver pipes that perform reliably even in the most demanding environments.
What is the use of duplex steel?
What is the use of duplex steel?
Duplex steel is widely used across industries such as chemical and petrochemical, oil and gas, marine, pulp and paper, construction, water treatment, food processing, and transport. Its combination of high strength and corrosion resistance makes it suitable for manufacturing pressure vessels, heat exchangers, pipelines, structural components, and seawater systems. Duplex steel also finds use in desalination plants, building structures, and food-grade equipment where durability and hygiene are essential.
What is the thickness of duplex pipe?
What is the thickness of duplex pipe?
The thickness of duplex steel pipes varies depending on the manufacturing method, outer diameter, and pipe schedule (such as SCH40 or SCH80). Seamless pipes generally range from 0.3 mm to 50 mm, while welded pipes typically range from 0.5 mm to 20 mm. Additionally, customized thickness options are available to meet specific project or application requirements.
What is the grade of duplex pipe?
What is the grade of duplex pipe?
The common grade of duplex pipe is 2205 (UNS S31803/S32205), which is a standard, and widely used grade.