Duplex S31803 tube is a seamless stainless steel tube made from UNS S31803 grade. It consists of approximately 50% ferrite and 50% austenite phases. This provides it with high strength and strong corrosion resistance.
ASTM A789 Duplex Steel UNS S31803 Seamless Tube Manufacturer
We, Zhejiang Xintongda Special Steel (XTD), are a China-based Duplex UNS S31803 seamless tube manufacturer and a global supplier. This tube is a nitrogen-enhanced duplex alloy with a microstructure of approximately 50% ferrite and 50% austenite. Our tubes comply with the ASTM A789 standard. S31803 duplex stainless steel tube offers high yield strength and improved toughness. This means improved strength over 300 series stainless steel. This ferritic-austenitic stainless steel, also known as Duplex 2205 (Werkstoff Nr 1.4462), provides superior resistance to chloride stress corrosion cracking and pitting. It is suitable for up to 300°C (572°F) service temperature. This makes it ideal for heat exchangers, chemical processing, and chloride-rich environments. Every DSS S31803 seamless tube undergoes strict quality checks. We have multiple international certifications and have a production capacity of 25000 tons. We can provide this tube in around a week for stock orders. Choose our Duplex S31803 seamless tube for high-performance applications that demand durability.
Our tubes meet the following specifications:
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Standard
ASTM A789
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OD Range
6-720 mm
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Thickness
1-65 mm
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Length
≤ 22 m
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Technical Data
Technical Data
Key Steps in Manufacturing Duplex Steel S31803 Tube
The manufacturing process of Duplex steel S31803 tube starts with high-quality solid billets. We use advanced methods like hot extrusion or piercing to form hollow shells. The final tube meets the required dimensions and strength due to cold drawing and heat treatment. Visit this page to find out more about the manufacturing of our seamless tubes.
What are the Characteristics of Duplex Steel S31803 Seamless Tube?
Our 1.4462 seamless tube offers 4 main features.
- Dual-Phase Microstructure: Our tube contains approximately equal parts of ferrite and austenite phases. This unique balance provides it with high mechanical strength and excellent ductility.
- High Tensile Strength: Our Duplex S31803 seamless tube provides approximately twice the yield strength of standard austenitic steels such as 316L. This allows the use of thinner walls to reduce the overall weight of piping systems.
- Suitability for Harsh Environments: Our Duplex tube operates reliably in high-pressure environments up to the recommended maximum service temperature of 300°C (572°F). It withstands sustained mechanical stress without cracking or failure during prolonged industrial service.
- High Corrosion Resistance: Our tube includes chromium (21–23%), molybdenum (2.5–3.5%), and nitrogen (0.08–0.20%) to resist corrosion, achieving a PREN of approximately 35. This prevents localised pitting and crevice corrosion in chloride-rich environments.
ASTM A789 UNS S31803 Duplex Tube Equivalent Material
Duplex S31803 tube is globally known as UNS S31803, Werkstoff Nr. 1.4462 and JIS SUS 329J3L.
| GRADE | UNS | GB | JIS | ISO | DIN/EN | GOST | |
| ISC | NEW | ||||||
| Duplex Stainless Steel 2205 | S31803 | 022Cr22Ni5Mo3N | — | SUS329J3L | X2CrNiMoN22-5-3 | 1.4462 | — |
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain size, ET, UT, HT)
- Laboratory Test Certificate from the Government-Approved Lab
Typical Applications for Duplex UNS S31803 Seamless Tube
UNS S31803 duplex stainless steel tube is used in 7 demanding industries:
Oil & Gas
This UNS S31803 Tube is used for flowlines and manifolds carrying sour gas. It handles high-pressure fluids and resists hydrogen-induced cracking in subsea environments.
Chemical Processing
Chemical plants use the ASME SA 789 UNS S31803 tube to transport organic acids and chlorides. It prevents the metal from thinning or leaking when exposed to aggressive processing chemicals.
Marine
In maritime engineering, this tube is used for seawater piping and offshore structural tubing. It resists the constant corrosive attack of seawater and provides high fatigue strength under waves.
Heat Exchangers
The Duplex tube is used to transfer heat between two fluids in industrial cooling systems. It is preferred because it resists stress corrosion cracking better than the 300 series austenitic stainless steels.
Pressure Vessels
This tube is used to build storage tanks that hold pressurised gases. The high strength of the tube allows the vessels to hold high pressure safely while remaining lightweight.
Desalination Plants
The 1.4462 tube is used in high-pressure piping systems that turn seawater into fresh water. It survives the high salt concentrations that would quickly destroy lower grades of steel.
Pulp & Paper
The tube is used in digesters and bleach plant equipment. It withstands the highly alkaline and acidic liquids used during the wood pulping and paper whitening processes.
Questions related to UNS S31803 Tube
-
What is Duplex S31803 Tube?
- Key Steps in Manufacturing Duplex Steel S31803 Tube
- What are the Characteristics of Duplex Steel S31803 Seamless Tube?
- ASTM A789 UNS S31803 Duplex Tube Equivalent Material
- 100% Certified Testing & Documentation
- Typical Applications for Duplex UNS S31803 Seamless Tube
- Questions related to UNS S31803 Tube