Duplex Steel Seamless Tubes Manufacturer and Supplier in Thailand

Duplex steel seamless tubes are hollow cylindrical components made from duplex stainless steel, which has a mixed microstructure of austenite and ferrite. Thaida Stainless Steel Manufacturing (Thailand) Co., Ltd., based in Chon Buri, is a trusted manufacturer and supplier of duplex seamless tubes to meet industrial demands. We specialize in offering tubes that are strong and highly corrosion-resistant, ensuring excellent performance in demanding environments. These tubes are manufactured without a welded seam, offering uniform strength and structure throughout. Compliant with key industrial standards such as ASTM A789, we offer these tubes in a wide range of sizes, grades tailored to fit various applications.

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About Duplex Seamless Tubes

Duplex seamless tubes are high-performance tubular products designed for environments that demand exceptional strength, durability, and corrosion resistance. Made from a balanced mix of austenitic and ferritic stainless steel, these tubes offer excellent mechanical properties and superior resistance to stress corrosion cracking, pitting, and crevice corrosion. Its composition includes chromium, nickel, molybdenum, and the balanced iron elements that enhance performance in harsh and high-pressure conditions. Duplex steel tubes are commonly used in the oil and gas, chemical, marine, and power generation sectors, where reliability and strength are crucial.

Feature and Benefits of Duplex Seamless Tubes

Duplex Seamless Tubes features include a powerful combination of mechanical strength, corrosion resistance, and structural integrity which make them ideal for aggressive environments and high-pressure applications.

These tubes provide exceptional tensile strength and fatigue resistance, ensuring long service life even in demanding conditions.

Duplex tubes can be easily welded and formed without compromising their mechanical properties, enabling flexible fabrication and installation.

The high chromium and molybdenum content delivers outstanding resistance to pitting, crevice, and general corrosion in chloride-rich and acidic environments.

Their dual-phase structure makes them highly resistant to stress corrosion cracking, especially in chloride and high-temperature environments.

The combination of austenitic and ferritic phases offers a balance of strength, toughness, and corrosion resistance.

A uniform, seamless surface finish enhances flow performance, reduces maintenance, and improves the overall aesthetic and hygiene of the system.

Why Choose Our Duplex Steel Seamless Tubes?

Thaida is the manufacturer and supplier of high-quality duplex steel seamless tubes, known for their superior strength, resistance, and long-lasting performance. Designed to meet demanding industrial standards, our tubes offer excellent mechanical properties and reliability under high pressure. Available in various sizes, thicknesses, and cut-to-length options, our duplex tubes are the ideal choice for critical applications across multiple industries.

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Duplex Steel Seamless Tubing Specifications

Below are the duplex steel seamless tubes specifications, outlining the key standards, sizes, finishes, and certificates details to help you choose the right tubing for your application needs.

Tubes Specifications	ASTM A789 / ASME SA789
Dimensional specification	ANSI/ASME B36.19M, ANSI/ASME B36.10M
ASTM A789 Duples Steel Tubes Size	1 / 2" NB - 16" NB
Outside Diameter	6.00 mm OD up to 914.4 mm OD, Sizes up to 24” NB available Ex-stock, OD Size Steel Tubes available Ex-stock
Duplex Steel Seamless Tubes Manufacturing Shapes	Hydraulic, Round, Rectangle, Square, Hex, Honed
Duplex Steel Seamless Tubes Manufacturing Techniques	Seamless
Duplex Steel Seamless Tubes Schedule Thickness Range	SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS
Duplex Steel Seamless Tubes End Types	Plain End, Beveled End, Treaded One End, TBE (Treaded Both Ends)
Delivery Condition of Duplex Steel Seamless Tubes	Annealed and Pickled, Polished, Bright Annealed, Cold Drawn
Surface Finish	No.1, No.4, No.8 Mirror Finish, 2B
Value Added Services	Cutting, Beveling, Polishing, Threading, Destructive, Non-Destructive, Ultrasonic Testing
Inspection and Test Reports	EN 10204 3.1, Mill Test Certificates, Chemical Reports, PMI Test Reports, Mechanical Reports, Third Party Inspection, NABL Approved Lab, Visual Inspection, Destructive Test and Non-Destructive Test Reports
Marking	Specification Grade Nominal Tubes Sizes Tubes Schedule or Wall Thickness Manufacturing Method (Seamless) Heat Number Manufacturer’s Name or Custom Logo - on request Marked Tubes Sample: ANSI B36.19 ASTM A 213 12" NB SCH 40S SEAMLESS HEAT NO. XXXX
Outside Finish	2B, No.4, No.1, No.8 Mirror Finish for Stainless Steel Tubes, Finish as per customer Requirements
Delivery Condition	Annealed and Pickled, Polished, Bright Annealed, Cold Drawn
Packing of Duplex Steel Seamless Tubes	Packed in Wooden Boxes, Plastic Bags, Steel Strips Bundled, or as per Customers Requests
Specials	Sizes and Specifications other than above can be on request

Types of Duplex Steel Seamless Tubes

We offer various types of duplex steel seamless tubes such as square, thick wall, rectangular etc to suit a variety of design requirements.

Duplex Steel Seamless Sizes Chart

The Duplex Steel Seamless Sizes Chart provides detailed information on the available diameters, wall thicknesses of these tubes. This chart is designed to help you select the ideal tube size based on your specific application requirements.

Diameter		Wall Thickness
Diameter		0.71mm	0.89mm	1mm	1.24mm	1.5mm	1.65mm	2mm	2.11mm	2.41mm	2.77mm	3.05mm	3.4mm
mm	in	kg/mtr	kg/mtr	kg/mtr	kg/mtr	kg/mtr	kg/mtr	kg/mtr	kg/mtr	kg/mtr	kg/mtr	kg/mtr	kg/mtr
6.35	0.250	0.1	0.12	0.13	0.16	0.18	0.19
7.94	0.313	0.13	0.16	0.17	0.21	0.24	0.26
9.52	0.375	0.16	0.19	0.21	0.26	0.3	0.33	0.38	0.39
12.7	0.500	0.21	0.26	0.29	0.36	0.42	0.46	0.54	0.56
15.87	0.625	0.27	0.33	0.37	0.45	0.54	0.59	0.69	0.73
19.05	0.750	0.33	0.4	0.45	0.55	0.66	0.72	0.85	0.89	1	1.13	1.22
22.22	0.875				0.65	0.78	0.85	1.01	1.06	1.2	1.35	1.46
25.4	1.00				0.75	0.9	0.98	1.17	1.23	1.39	1.57	1.71	1.87
31.75	1.250				0.95	1.14	1.24	1.49	1.57	1.77	2.01	2.19	2.41
38.1	1.500				1.14	1.37	1.51	1.81	2.15	2.15	2.45	2.68	2.95
44.45	1.750						1.77	2.13	2.54	2.54	2.89	3.16	3.49
50.8	2.00						2.03	2.44	2.92	2.92	3.33	3.65	4.04

Duplex Seamless Tubes Manufacturing Process

There are 5 key steps involved in the duplex steel Seamless tube manufacturing process which are as follows. Every step is carefully done to ensure the tubes are durable and have a smooth finish.

1. Raw Material Selection
High-quality duplex steel billets and strips are carefully selected for superior strength and corrosion resistance.

2. Tubes Formation
The selected raw material is formed into tubes using seamless extrusion methods, depending on the application.

3. Heat Treatment
Tubes undergo required controlled heat treatment to enhance mechanical properties and relieve internal stresses.

4. Cold Working and Finishing
After heat treatment, tubes are cold-worked for better surface finish, dimensional accuracy and improved strength.

5. Quality Control and Testing
Every tube is thoroughly inspected and tested to ensure it meets international quality standards for performance and reliability.

Applications of Duplex Steel Seamless Tubes

Duplex Steel Seamless Tubes are primarily used in the oil and gas industry for offshore platforms, subsea equipment, and pipelines. Their excellent corrosion resistance and strength make them suitable for chemical processing, desalination plants, and marine environments as well.

Oil and Gas Industry

Marine Applications

Chemical Industry

Petrochemical Industry

Power Plants

Aerospace & Defense

Automotive and Transportation

Desalination Plants

Pulp and Paper Industry

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FAQ

What makes Duplex Steel different from regular stainless steel?

Duplex steel has a unique mix of austenitic and ferritic structures. This gives higher strength than regular stainless steel. It also offers better resistance to corrosion, pitting, and stress cracking. Duplex steel works well in harsh chemical and marine environments where ordinary stainless steel will fail.

What are seamless steel tubes used for?

Seamless steel tubes carry liquids and gases safely under high pressure. They are used in oil, gas, chemical, and water pipelines. The smooth interior surface reduces friction and prevents leaks. These tubes are ideal for high-stress and high-temperature systems.

Can Duplex Steel Seamless Tubes withstand high pressure?

Yes. Duplex steel seamless tubes have high yield and tensile strength. They can handle pressure in pipelines, pumps, and chemical reactors safely. Even in corrosive or hot environments, these tubes maintain shape and performance.

What is duplex steel tube?

A duplex steel tube combines ferritic and austenitic stainless steel. This mix gives strong corrosion resistance, high strength, and long service life. Duplex tubes are ideal for chemical, marine, and industrial applications. They perform well under heat, pressure, and corrosive media.

Which industries specifically require Duplex Steel Tubes?

Duplex steel tubes are widely used in oil and gas, chemical, and petrochemical industries. They are also found in seawater desalination, pulp and paper, power plants, and marine equipment. Any industry needing strength and corrosion resistance benefits from duplex tubes.

What are the grades of duplex steel seamless tubes?

Common grades include Duplex 2205, Duplex 2304, and Super Duplex 2507. Each grade varies in corrosion resistance, strength, and temperature limits. Selecting the right grade ensures long life and reliable performance in specific environments.

Can Thaida provide customized Duplex Steel Seamless Tubes?

Yes. We offer tubes in custom lengths, diameters, and wall thicknesses. Special grades and finishes are also available. This helps industries meet exact project requirements efficiently.

What are the benefits of duplex steel tubes?

Duplex steel tubes offer high strength, excellent corrosion resistance, and long service life. They resist pitting, stress cracking, and heat damage. Maintenance is minimal, and the tubes perform reliably in harsh and demanding environments.