Duplex Steel UNS S31803 Seamless Tube Manufacturer and Supplier in Thailand
Duplex Steel S31803 Seamless Tubes is a hollow cylindrical tube made from UNS S31803 grade duplex stainless steel with no welded joints. Thaida is a trusted manufacturer and supplier of Duplex stainless steel UNS S31803 seamless tubes (DIN 1.4462) in Thailand, known for delivering high-quality products for demanding industrial applications. With advanced manufacturing capabilities, we provide a wide size range, custom wall thicknesses, and compliance with ASTM A789 international standards. Our expertise, stringent quality control, global certifications, and responsive customer service make us a reliable partner for your project needs.
Product Overview: Duplex S31803 Seamless Tubes
Duplex S31803 seamless tubes are a high-performance alloy made with a dual-phase microstructure of austenite and ferrite, offering the perfect balance of strength and corrosion resistance. This structure gives the tubes high durability and excellent mechanical strength, making them ideal for demanding applications. S31803 tubing excels in aggressive environments, with outstanding resistance to oxidation, pitting, and crevice corrosion, especially in marine, offshore, and chemical processing settings. Its chemical composition includes chromium, molybdenum, and nitrogen, enhancing its performance in chloride-rich, acidic, and sour (H₂S) conditions.
Key Features & Advantages Duplex S31803 Seamless Tubing
Below are duplex S31803 seamless tubing features such as corrosion resistance, durability, strength and more that make it a preferred choice for various demanding applications:
Excellent Corrosion Resistance
Duplex S31803 offers outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking in aggressive environments. This makes it ideal for use in chemical processing, marine, and offshore industries.
High Strength and Durability
With nearly twice the strength of standard austenitic stainless steels, S31803 tubing provides superior mechanical performance, allowing for reduced wall thickness and extended service life.
Low Thermal Expansion
Duplex stainless steel exhibits lower thermal expansion compared to austenitic grades, minimizing distortion and dimensional changes in high-temperature applications.
Duplex Microstructure
The dual-phase microstructure of S31803 combines the advantages of ferritic and austenitic steels, offering a balanced performance of strength, toughness, and corrosion resistance.
Good Weldability and Fabrication
Duplex S31803 seamless tubing is easily weldable using standard welding techniques and offers good formability, making it suitable for complex fabrication needs without compromising structural integrity.
Cost-Effectiveness
Due to its high strength and corrosion resistance, thinner walls and lighter designs can be used, leading to reduced material and maintenance costs over the product’s lifespan.
Why Choose Our ASTM A789 UNS S31803 Tubes
Thaida Stainless Steel Manufacturing (Thailand) Co., Ltd. is a trusted manufacturer and supplier of ASTM A789 UNS S31803 duplex stainless seamless tubes, known for consistent quality, precision, and performance. With advanced manufacturing facilities, strict quality control, and timely delivery, we ensure customer satisfaction at every stage. Our commitment to international standards, competitive pricing, and exceptional customer support sets us apart from other suppliers in the industry.
Competitive Pricing
Global Exports Expertise
Large Inventory & Fast Dispatch
Custom Sizes & Finishes
Industry Certifications & Compliance
Advanced Production Technology
After-Sales Support, Service- Technical Support
In-House Testing & Full Traceability
UNS S31803 Duplex Steel Seamless Tubes Specification
The specification of UNS S31803 Duplex steel seamless tubes outlines the key standards, sizes, forms, and finishes applicable to these tubes.
| Grade | Duplex Stainless Steel UNS S31803 |
|---|---|
| Standard | ASTM A789 / ASME SA789 |
| UNS Number | S31803 |
| Werkstoff Number | 1.4462 |
| Form | Seamless Tubes |
| Size Range | 6.35 mm OD to 101.6 mm OD |
| Wall Thickness | 0.5 mm to 12.7 mm |
| Length | Up to 12 meters or custom cut lengths |
| End | Plain, Beveled, Threaded |
| Surface Finish | Annealed and Pickled, Polished |
Equivalent grades of S31803 Seamless Tubes
S31803 seamless tubes equivalent table includes international material codes, DIN numbers, and other global standards.
| UNS Number | Werkstoff Number |
|---|---|
| S31803 / S32205 | 1.4462 |
Chemical Composition of ASME SA 213 Seamless Tubes
The chemical composition of UNS S31803 seamless tubing is detailed, showing the specific elements and their percentages that contribute to its strength and corrosion resistance.
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 4.50 – 6.50 |
| Iron (Fe) | 63.72 min |
| Chromium (Cr) | 22.0 – 23.0 |
| Carbon (C) | 0.030 max |
| Silicon (Si) | 1.00 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.030 max |
| Sulfur (S) | 0.020 max |
| Nitrogen (N) | 0.14 – 0.20 |
Mechanical Properties of S31803 Duplex Stainless Steel Tubes
S31803 duplex stainless steel tubes mechanical properties like tensile strength, yield strength, and elongation are outlined below.
| Grade | Density | Melting Point | Yield Strength (0.2% Offset) | Tensile Strength | Elongation |
|---|---|---|---|---|---|
| Duplex S31803 | 7.8 g/cm³ | 1350 °C (2460 °F) | Psi – 80,000 , MPa – 550 | Psi – 116,000 , MPa – 800 | 15 % |
Duplex Steel S31803 Seamless Tubes Manufacturing Process
Following are the 5 steps involved in the duplex steel S31803 seamless tube manufacturing process to achieve high-quality output.
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 Stainless Steel S31803 Seamless Tubes
Duplex stainless steel S31803 seamless tubes are widely used in industries requiring high strength and excellent corrosion resistance. These tubes are commonly employed in chemical processing, oil and gas, marine, and power generation industries.
Oil and Gas Industry
Marine Applications
Chemical Industry
Petrochemical Industry
Power Plants
Aerospace & Defense
Automotive and Transportation
Desalination Plants
Pulp and Paper Industry
FAQ
Why choose Duplex Steel UNS S31803 over standard stainless steel?
Duplex Steel UNS S31803 offers higher strength and superior corrosion resistance than standard stainless steel. It resists pitting, stress corrosion cracking, and chloride attack. This makes it ideal for harsh chemicals, seawater, and high-pressure applications. It also has a longer service life, reducing maintenance and replacement costs.
What is a duplex stainless steel S31803 tube?
Which industries use Duplex Steel UNS S31803 Seamless Tubes?
UNS S31803 tubes are used in oil and gas, chemical, petrochemical, and seawater desalination industries. Power plants, pulp and paper, and marine equipment also rely on these tubes. Any application that demands strength, durability, and corrosion resistance can benefit from S31803 tubes.
What is the difference between UNS S31803 and 316?
UNS S31803 contains more chromium, molybdenum, and nitrogen than 316 stainless steel. This makes it stronger and more resistant to pitting and stress corrosion cracking. While 316 works for general corrosion, S31803 handles tougher environments like seawater, acids, and high-pressure systems.
Why choose Duplex Steel UNS S31803 Seamless Tubes over 304/316 stainless steel?
S31803 tubes handle chloride, acids, and seawater far better than 304 or 316. They also have higher strength and resist stress cracking. This improves safety, reduces maintenance, and ensures a longer service life in demanding applications.
What material is UNS S31803?
UNS S31803 is a duplex stainless steel with a balanced ferritic and austenitic structure. It contains chromium, nickel, molybdenum, and nitrogen. This combination delivers high strength, corrosion resistance, and excellent performance under heat, pressure, and harsh chemical exposure.
Can Thaida supply custom Duplex Steel UNS S31803 Seamless Tubes?
Yes. We can supply S31803 tubes in custom lengths, diameters, wall thickness, and finishes. Special grades and specifications are available to meet project or industry-specific needs. Custom solutions ensure the tubes perform reliably in all conditions.