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Girgaon, Mumbai - 400004
Duplex Steel UNS S31803 Welded Tubes Manufacturer in India
What Are Duplex Steel UNS S31803 Welded Tubes?
Duplex Steel UNS S31803 Welded Tubes are tubular products manufactured from duplex stainless steel with a two-phase microstructure of austenitic and ferritic stainless steel. UNS S31803 is a widely used duplex grade offering a combination of high mechanical strength, excellent corrosion resistance, good toughness and resistance to chloride-induced stress corrosion cracking.
Duplex Steel UNS S31803 Welded Tubes are valued for their high strength-to-weight ratio, resistance to pitting and crevice corrosion, good resistance to stress corrosion cracking and reliable performance in demanding environments. The balanced austenitic-ferritic structure provides properties that make the grade suitable for applications where both strength and corrosion resistance are required.
These welded tubes are used in oil and gas equipment, petrochemical plants, chemical processing systems, marine applications, desalination plants, heat exchangers, power generation and wastewater treatment equipment. Tube dimensions, wall thickness, weld condition, finish and testing requirements are selected according to the application and applicable standards.
Kamal Steels is a reliable Duplex Steel UNS S31803 Welded Tubes Manufacturer and Stockist in India, supplying welded tubes in different sizes, wall thicknesses, lengths and finishes according to customer and project requirements. We also cater to international requirements with suitable export packaging and documentation.
Table of Contents
- Duplex Steel UNS S31803 Welded Tube Specifications
- Duplex Steel UNS S31803 Welded Tube Size Chart
- Duplex Steel UNS S31803 Welded Tube Weight Chart
- Duplex Steel UNS S31803 Welded Tube Standards
- Duplex Steel UNS S31803 Welded Tube Features
- Duplex Steel UNS S31803 Chemical Composition
- Duplex Steel UNS S31803 Mechanical Properties
- Duplex Steel UNS S31803 Equivalent Grades
- UNS S31803 Welded Tubes vs Other Duplex Grades
- Duplex Steel UNS S31803 Welded Tube Applications
- Industries Using UNS S31803 Welded Tubes
- Frequently Asked Questions
Duplex Steel UNS S31803 Welded Tube Specifications
Duplex Steel UNS S31803 Welded Tubes are manufactured and supplied according to applicable ASTM, ASME and other international specifications. The tubes can be supplied in different dimensions, lengths and finishes according to project requirements.
| Specification | Duplex Steel UNS S31803 Welded Tubes |
|---|---|
| Material | Duplex Stainless Steel |
| Grade | UNS S31803 |
| Common Grade | Duplex 2205 |
| Tube Type | Welded |
| ASTM Standard | ASTM A789 / As specified |
| ASME Standard | ASME SA789 / As specified |
| Outside Diameter | As per requirement |
| Wall Thickness | As per requirement |
| Length | Random, Fixed or Customized |
| Finish | Pickled, Polished or As required |
Duplex Steel UNS S31803 Welded Tube Size Chart
Duplex Steel UNS S31803 Welded Tubes are available in different outside diameters and wall thicknesses for process piping, heat exchangers and specialized industrial systems. Customized sizes can also be supplied according to customer drawings and project requirements.
| Tube Size | Outside Diameter (mm) | Wall Thickness | Length |
|---|---|---|---|
| 1/2" | 12.70 | As required | As required |
| 3/4" | 19.05 | As required | As required |
| 1" | 25.40 | As required | As required |
| 1-1/2" | 38.10 | As required | As required |
| 2" | 50.80 | As required | As required |
| 3" | 76.20 | As required | As required |
| 4" | 101.60 | As required | As required |
| 6" | 152.40 | As required | As required |
| 8" | 203.20 | As required | As required |
Duplex Steel UNS S31803 Welded Tube Weight Chart
The theoretical weight of Duplex Steel UNS S31803 Welded Tubes depends on outside diameter, wall thickness and length. Actual weight may vary according to manufacturing tolerances and dimensional specifications.
| Outside Diameter (mm) | Wall Thickness (mm) | Inside Diameter (mm) | Approx. Weight (kg/m) |
|---|---|---|---|
| 12.70 | 1.00 | 10.70 | 0.35 |
| 19.05 | 1.50 | 16.05 | 0.82 |
| 25.40 | 2.00 | 21.40 | 1.51 |
| 31.75 | 2.50 | 26.75 | 2.38 |
| 38.10 | 3.00 | 32.10 | 3.35 |
| 50.80 | 3.00 | 44.80 | 4.64 |
| 63.50 | 3.00 | 57.50 | 5.94 |
| 76.20 | 4.00 | 68.20 | 9.49 |
| 101.60 | 5.00 | 91.60 | 15.43 |
Note: Weight values are approximate theoretical references. Final weight depends on actual dimensions, tolerances, density and manufacturing conditions.
Duplex Steel UNS S31803 Welded Tube Standards
Duplex Steel UNS S31803 Welded Tubes can be supplied according to applicable ASTM, ASME and other international standards depending on product form, dimensions and application requirements.
| Standard / Designation | Details |
|---|---|
| UNS | S31803 |
| Common Grade | Duplex 2205 |
| ASTM | ASTM A789 |
| ASME | ASME SA789 |
| Product Form | Welded Tube |
Duplex Steel UNS S31803 Welded Tube Features
Duplex Steel UNS S31803 combines high mechanical strength with excellent corrosion resistance, making it suitable for demanding environments where both properties are required.
- High mechanical strength
- Excellent resistance to chloride-induced stress corrosion cracking
- Good resistance to pitting and crevice corrosion
- Good toughness and durability
- Good resistance to general corrosion
- High strength-to-weight ratio
- Suitable for marine and chloride-containing environments
- Good weldability when properly processed
- Suitable for demanding industrial applications
- Reliable performance under corrosive operating conditions
Duplex Steel UNS S31803 Chemical Composition
UNS S31803 contains a balanced combination of chromium, nickel and molybdenum with controlled nitrogen and other alloying elements. This composition provides the duplex microstructure and contributes to the grade's strength and corrosion resistance.
| Element | Composition (%) |
|---|---|
| Chromium | 21.0 - 23.0 |
| Nickel | 4.5 - 6.5 |
| Molybdenum | 2.5 - 3.5 |
| Nitrogen | 0.08 - 0.20 |
| Carbon | 0.030 max. |
| Manganese | 2.00 max. |
| Silicon | 1.00 max. |
| Phosphorus | 0.030 max. |
| Sulfur | 0.020 max. |
| Iron | Balance |
Duplex Steel UNS S31803 Mechanical Properties
UNS S31803 provides high tensile and yield strength together with good ductility and toughness. The actual mechanical properties depend on product form, dimensions, heat treatment and applicable specification.
| Property | Minimum / Typical Requirement |
|---|---|
| Tensile Strength | 620 MPa min. |
| Yield Strength | 450 MPa min. |
| Elongation | 25% min. |
| Density | Approx. 7.8 g/cm³ |
Note: Mechanical properties may vary according to tube dimensions, product condition and applicable material specification. Certified material test reports should be used for final verification.
Duplex Steel UNS S31803 Equivalent Grades
| Designation | Equivalent / Related Grade |
|---|---|
| UNS | S31803 |
| Common Name | Duplex 2205 |
| EN Material Number | 1.4462 |
| EN Grade | X2CrNiMoN22-5-3 |
UNS S31803 Welded Tubes vs Other Duplex Grades
Duplex stainless steel grades differ in alloy composition, corrosion resistance and mechanical properties. UNS S31803 is a widely used duplex grade, while higher-alloyed grades may provide increased resistance for more severe environments.
| Property | UNS S31803 | UNS S32205 | Super Duplex UNS S32750 |
|---|---|---|---|
| Material Type | Duplex Stainless Steel | Duplex Stainless Steel | Super Duplex Stainless Steel |
| Corrosion Resistance | Excellent | Excellent | Very High |
| Strength | High | High | Very High |
| Typical Service | General duplex applications | Demanding duplex applications | Severe chloride and marine environments |
Duplex Steel UNS S31803 Welded Tube Applications
Duplex Steel UNS S31803 Welded Tubes are used in applications requiring high strength and excellent resistance to corrosion, particularly in chloride-containing and demanding industrial environments.
Oil & Gas Equipment
Used in process systems, piping components and tubular equipment exposed to corrosive oil and gas environments.
Chemical Processing
Used in chemical processing systems requiring high strength and resistance to corrosive chemicals.
Marine Systems
Used in marine equipment and systems exposed to seawater and chloride-containing environments.
Desalination Plants
Used in selected desalination and water-treatment equipment requiring corrosion-resistant materials.
Heat Exchangers
Used in heat-transfer equipment where strength and corrosion resistance are required.
Petrochemical Equipment
Used in process equipment and tubular systems operating under demanding corrosive conditions.
Industries Using UNS S31803 Welded Tubes
Kamal Steels supplies Duplex Steel UNS S31803 Welded Tubes to industries requiring high-strength and corrosion-resistant tubular products for demanding operating environments.
Oil & Gas Industry
Used in offshore and onshore equipment, process systems and tubular components.
Chemical Industry
Used in chemical processing equipment exposed to corrosive operating conditions.
Marine Industry
Used in marine systems and equipment exposed to seawater and chloride environments.
Power Generation Industry
Used in selected power-generation equipment and heat-transfer systems.
Water Treatment Industry
Used in desalination, wastewater treatment and water-processing systems.
Petrochemical Industry
Used in process equipment and piping systems requiring high strength and corrosion resistance.
Frequently Asked Questions
Duplex Steel UNS S31803 Welded Tubes are high-strength duplex stainless steel tubes manufactured using advanced welding processes. They combine excellent corrosion resistance with nearly twice the strength of conventional austenitic stainless steels.
Our Duplex Steel UNS S31803 Welded Tubes are manufactured according to ASTM A789, ASTM A790, ASTM A928, ASME SA789, and ASME SA790 standards.
These welded tubes offer exceptional strength, excellent resistance to chloride stress corrosion cracking, pitting, crevice corrosion, seawater corrosion, outstanding weldability, and long service life.
They are widely used in offshore oil & gas platforms, marine engineering, chemical processing plants, petrochemical industries, heat exchangers, desalination plants, power generation facilities, and seawater piping systems.
Yes. Duplex Steel UNS S31803 provides excellent resistance to seawater corrosion, chloride-induced corrosion, pitting, and crevice corrosion, making it ideal for marine and offshore applications.
Each tube undergoes PMI Testing, Chemical Analysis, Mechanical Testing, Hydrostatic Testing, Ultrasonic Testing (UT), Eddy Current Testing (ECT), Weld Integrity Testing, Dimensional Inspection, and Visual Inspection.
Yes. Duplex Steel UNS S31803 Welded Tubes provide excellent mechanical strength, high pressure resistance, and outstanding durability when manufactured according to ASTM standards.
Yes. Every shipment includes EN 10204 3.1/3.2 Mill Test Certificates, inspection reports, complete material traceability, and third-party inspection certificates upon request.
Yes. Kamal Steels exports Duplex Steel UNS S31803 Welded Tubes worldwide with export-standard packaging, complete documentation, and timely international delivery.
Kamal Steels offers ASTM-compliant Duplex Steel UNS S31803 Welded Tubes with ready stock, certified quality, competitive pricing, stringent quality control, export-standard packaging, complete documentation, and dependable worldwide delivery for critical industrial applications.