Top Duplex Steel S31803 Tubes Exporters – A Complete Guide

In the ever-evolving landscape of industrial materials, Duplex Steel S31803 Tubes stand out as a high-performance choice for applications requiring strength, corrosion resistance, and durability. These tubes, known for their unique two-phase microstructure of austenite and ferrite, offer superior mechanical properties and corrosion resistance compared to conventional stainless steels. With increasing demand across the globe, the role of Duplex Steel S31803 Tubes exporters has become crucial in bridging manufacturers and industries worldwide.

What Is Duplex Steel S31803?

Duplex Steel S31803 is a nitrogen-enhanced duplex stainless steel that was developed to combat common corrosion problems encountered with 300 series stainless steels. Its key features include:

High strength (almost double that of standard austenitic stainless steels)

Excellent resistance to stress corrosion cracking and pitting

Good weldability and workability

Cost-effectiveness, owing to lower nickel and molybdenum content

These characteristics make S31803 ideal for demanding industries such as oil and gas, petrochemicals, desalination, chemical processing, and marine engineering.

The special two-phase microstructure of Duplex Steel S31803 combines both austenitic and ferritic stainless phases of stainless steel material, producing a high strength, as compared to standard stainless steels such as 304 or 316. The dual-phase structure, as well, enhances good resistance to pitting and crevice corrosion hence is very appropriate in low and harsh media chloride media.

The special two-phase microstructure of Duplex Steel S31803 combines both austenitic and ferritic stainless phases of stainless steel material, producing a high strength, as compared to standard stainless steels such as 304 or 316. The dual-phase structure, as well, enhances good resistance to pitting and crevice corrosion hence is very appropriate in low and harsh media chloride media.

Chemical Composition of Duplex Steel Tubes

Grade Common Name C% Mn% Si% P% S% Cr% Ni% Mo% N%

2205 S31803 0.030 2.00 1.00 0.030 0.020 21.0-23.0 4.5-6.5 2.5-3.5 0.08-0.20

S32205 0.030 2.00 1.00 0.030 0.020 21.0-23.0 4.5-6.5 2.5-3.5 0.08-0.20

Mechanical Properties Of Duplex Steel Seamless & Welded Tubes

Tensile Strength, ksi 90 min

0.2% Yield Strength, ksi 65 min

Elongation, % 25 min

Hardness [HRC] 293 max

Physical Properties of UNS S31803 Duplex Steel Tubes

Density lbm/in3 Electrical Resistivity mW•in Thermal Conductivity (BTU/hr•ft•°F) Heat Capacity BTU/lbm•°F Electrical Resistivity (in x 10-6)

at 68°F 0.278 27.6 8.7 0.112 33.5

at 212°F 26.1 9.2 0.119 35.4

at 392°F 25.4 9.8 0.127 37.4

at 572°F 24.9 10.4 0.134 39.4

Equivalent Grades Of Duplex Stainless Steel Tubes

STANDARD UNS WNR.

Duplex Steel S31803 S31803 1.4462

Why Choose Reliable Duplex Steel S31803 Tubes Exporters?

The global industrial sector depends heavily on high-quality piping and tubing systems, and choosing a trusted exporter ensures:

Compliance with international standards such as ASTM A789 / A790

Timely delivery and proper packaging for overseas shipping

Third-party inspections and quality certifications

Custom sizes and finishes to match specific project needs

Competitive pricing with value-added services like cutting, threading, and polishing

Leading Export Destinations

Top exporters of Duplex Steel S31803 Tubes cater to markets in:

Middle East (UAE, Saudi Arabia, Qatar)

Europe (Germany, UK, France)

Southeast Asia (Singapore, Malaysia, Indonesia)

North America (USA, Canada)

Africa (South Africa, Nigeria)

The growing global demand is driven by infrastructure projects, offshore drilling, and increasing awareness about sustainable, long-lasting materials.

Applications of Duplex Steel S31803 Tubes

Oil & Gas Industry – Subsea and offshore pipelines

Chemical Processing – Heat exchangers and pressure vessels

Desalination Plants – Resistance to chlorinated water

Marine Engineering – Structural tubing for ships and platforms

Pulp & Paper – Chemical handling systems

Specification of Duplex Steel S31803 Seamless / Welded Tubes

Specifications AASTM A790 / ASME SA790, ASTM A789 / ASME SA A789

Grade : UNS S31803, S32205

Size : ½”NB – 24”NB

Thickness Range : 0.3mm – 50 mm, SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS

Outer Diameter: 6.0-630mm

Type :Seamless / ERW / Welded / Fabricated Pipes

Form : Round, Square, Rectangular, Oval, Hydraulic Etc

Length :Single Random, Double Random & Required Length

End : Plain End, Beveled End, Treaded

End Protection : Plastic Caps

Outside Finish :2B, No.4, No.1, No.8 Mirror Finish for Stainless Steel Pipes, Finish as per customer Requirements

Delivery Condition : Annealed and Pickled, Polished, Bright Annealed, Cold Drawn

Inspection, Test Reports :Mill Test Certificates, EN 10204 3.1, Chemical Reports, Mechanical Reports, PMI Test Reports, Visual Inspection Reports, Third Party Inspection Reports, NABL Approved Lab Reports, Destructive Test Report, Non Destructive Test Reports

Packing :Packed in Wooden Boxes, Plastic Bags, Steel Strips Bundled, or as per Customers Requests

Specials :Sizes and Specifications other than above can be manufactured on requestFinal Thoughts

When selecting Duplex Steel S31803 Tubes exporters, prioritize companies with a proven track record, adherence to international quality standards, and the ability to fulfill custom specifications. As industries continue to shift toward higher efficiency and corrosion resistance, S31803 tubes will remain a top choice, and trusted exporters will play a pivotal role in their global availability.