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Girgaon, Mumbai - 400004
Duplex Steel UNS S31803 Seamless Tubes Manufacturer in India
What Are Duplex Steel UNS S31803 Seamless Tubes?
Duplex Steel UNS S31803 Seamless Tubes are tubular products manufactured from duplex stainless steel with a balanced austenitic and ferritic microstructure. UNS S31803 is a commonly specified duplex stainless steel grade offering a combination of high mechanical strength, good toughness, corrosion resistance and resistance to chloride-induced stress corrosion cracking.
Duplex Steel UNS S31803 Seamless Tubes are valued for their high strength-to-weight ratio, good resistance to pitting and crevice corrosion, reliable performance in chloride-containing environments and excellent durability. The seamless construction provides a continuous tubular structure without a longitudinal weld, making these tubes suitable for demanding pressure and process applications.
These seamless tubes are used in oil and gas equipment, petrochemical plants, chemical processing systems, marine applications, heat exchangers, desalination plants, power generation and wastewater treatment equipment. Grade, outside diameter, wall thickness, schedule, length and finish are selected according to the operating conditions and applicable material specifications.
Kamal Steels is a reliable Duplex Steel UNS S31803 Seamless Tubes Manufacturer and Stockist in India, supplying seamless tubes in different sizes, wall thicknesses, schedules, lengths and finishes according to customer and project requirements. We also cater to international requirements with suitable export packaging, MTC and documentation.
Table of Contents
- Duplex Steel UNS S31803 Seamless Tube Specifications
- Duplex Steel UNS S31803 Seamless Tube Size Chart
- Duplex Steel UNS S31803 Seamless Tube Weight Chart
- Duplex Steel UNS S31803 Seamless Tube Standards
- Duplex Steel UNS S31803 Seamless Tube Features
- Duplex Steel UNS S31803 Chemical Composition
- Duplex Steel UNS S31803 Mechanical Properties
- Duplex Steel UNS S31803 Equivalent Grades
- UNS S31803 Seamless Tubes vs UNS S32205 Seamless Tubes
- Duplex Steel UNS S31803 Seamless Tube Applications
- Industries Using UNS S31803 Seamless Tubes
- Frequently Asked Questions
Duplex Steel UNS S31803 Seamless Tube Specifications
Duplex Steel UNS S31803 Seamless Tubes are supplied in different dimensions and product conditions according to applicable ASTM, ASME and international standards. Custom sizes and lengths can be supplied according to project requirements.
| Specification | UNS S31803 Seamless Tubes |
|---|---|
| Material | Duplex Stainless Steel |
| Grade | UNS S31803 |
| Common Grade | Duplex 2205 |
| Tube Type | Seamless |
| ASTM Standard | ASTM A789 |
| ASME Standard | ASME SA789 |
| Outside Diameter | As per requirement |
| Wall Thickness | As per requirement |
| Schedule | As required |
| Length | Random, Fixed or Customized |
| Finish | Pickled, Annealed, Polished or As required |
Duplex Steel UNS S31803 Seamless Tube Size Chart
Duplex Steel UNS S31803 Seamless Tubes are available in various outside diameters and wall thicknesses for process, pressure, heat-transfer and industrial applications. Custom dimensions can also be supplied according to customer drawings and 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 Seamless Tube Weight Chart
The weight of Duplex Steel UNS S31803 Seamless Tubes depends on outside diameter, wall thickness and length. The following values are approximate theoretical references and actual weight may vary according to dimensions and manufacturing tolerances.
| 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 | 0.83 |
| 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 | 4.65 |
| 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 should be verified against actual dimensions and material test documentation.
Duplex Steel UNS S31803 Seamless Tube Standards
Duplex Steel UNS S31803 Seamless Tubes can be supplied according to applicable ASTM, ASME and other international standards depending on product dimensions, application and customer requirements.
| Standard / Designation | Details |
|---|---|
| UNS | S31803 |
| Common Grade | Duplex 2205 |
| ASTM | ASTM A789 |
| ASME | ASME SA789 |
| Product Form | Seamless Tube |
Duplex Steel UNS S31803 Seamless Tube Features
UNS S31803 offers a combination of high strength and corrosion resistance, making it suitable for demanding industrial environments where conventional austenitic stainless steel may not provide the required performance.
- High mechanical strength
- Good resistance to pitting corrosion
- Good resistance to crevice corrosion
- Resistance to chloride-induced stress corrosion cracking
- High strength-to-weight ratio
- Good toughness and durability
- Good resistance to general corrosion
- Suitable for demanding process applications
- Reliable performance in chloride-containing environments
- Seamless construction without a longitudinal weld
Duplex Steel UNS S31803 Chemical Composition
The chemical composition of UNS S31803 contains controlled levels of chromium, nickel, molybdenum and nitrogen. This balanced alloying system contributes to the grade's strength and resistance to localized corrosion.
| 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 with good elongation and toughness. Actual mechanical properties depend on product dimensions, heat treatment, manufacturing condition and the applicable material specification.
| Property | Minimum Requirement |
|---|---|
| Tensile Strength | 620 MPa min. |
| Yield Strength | 450 MPa min. |
| Elongation | 25% min. |
| Density | Approx. 7.8 g/cm³ |
Note: Mechanical requirements can vary according to product form, dimensions and applicable 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 Seamless Tubes vs UNS S32205 Seamless Tubes
UNS S31803 and UNS S32205 are closely related duplex stainless steel grades and are commonly associated with Duplex 2205. UNS S32205 is generally recognized as the more tightly controlled composition of the 2205 grade, while UNS S31803 is the earlier specification designation. The applicable standard and material certificate should always be checked when selecting the required grade.
| Property | UNS S31803 | UNS S32205 |
|---|---|---|
| Material Type | Duplex Stainless Steel | Duplex Stainless Steel |
| Common Association | Duplex 2205 | Duplex 2205 |
| Corrosion Resistance | Excellent | Excellent |
| Strength | High | High |
| Typical Service | Process and industrial applications | Demanding duplex applications |
Duplex Steel UNS S31803 Seamless Tube Applications
Duplex Steel UNS S31803 Seamless Tubes are used in applications requiring high strength, good corrosion resistance and reliable performance in demanding process and industrial environments.
Oil & Gas
Used in process equipment, piping systems and tubular components exposed to corrosive oil and gas environments.
Petrochemical Plants
Used in process systems and equipment requiring high strength and corrosion-resistant tubular products.
Chemical Processing
Used in chemical processing equipment exposed to corrosive chemicals and chloride-containing environments.
Marine Applications
Used in marine equipment and systems requiring resistance to seawater and chloride-related corrosion.
Heat Exchangers
Used in heat-transfer systems requiring durable and corrosion-resistant tubing.
Desalination
Used in water treatment and desalination equipment exposed to chloride-rich operating conditions.
Industries Using Duplex Steel UNS S31803 Seamless Tubes
Kamal Steels supplies Duplex Steel UNS S31803 Seamless Tubes to industries requiring high-strength and corrosion-resistant tubular products for demanding operating conditions.
Oil & Gas Industry
Used in exploration, production and processing equipment where strength and corrosion resistance are required.
Petrochemical Industry
Used in process equipment and piping systems exposed to demanding chemical and corrosive conditions.
Chemical Industry
Used in chemical processing systems requiring reliable corrosion-resistant materials.
Marine Industry
Used in marine and seawater applications where resistance to chloride environments is important.
Power Generation Industry
Used in selected power and cooling systems requiring durable corrosion-resistant tubing.
Water Treatment Industry
Used in desalination, water treatment and wastewater processing systems.
Frequently Asked Questions
Duplex Steel UNS S31803 Seamless Tubes are high-strength stainless steel tubes manufactured without welded joints. They offer excellent corrosion resistance, superior mechanical strength, and reliable performance in high-pressure and highly corrosive applications.
Our Duplex Steel UNS S31803 Seamless Tubes are manufactured according to ASTM A789, ASTM A790, ASME SA789, and ASME SA790 standards.
These seamless tubes provide high mechanical strength, excellent resistance to chloride stress corrosion cracking, pitting, crevice corrosion, superior pressure handling capability, and long service life.
They are widely used in offshore oil & gas platforms, marine engineering, chemical processing plants, petrochemical industries, heat exchangers, pressure vessels, desalination plants, and power generation facilities.
Seamless tubes have no welded joints, providing higher structural integrity, improved pressure resistance, better reliability, and reduced risk of weld-related failures in demanding industrial environments.
Each tube undergoes PMI Testing, Chemical Analysis, Mechanical Testing, Hydrostatic Testing, Ultrasonic Testing (UT), Eddy Current Testing (ECT), Dimensional Inspection, Surface Inspection, and Visual Inspection.
Yes. Duplex Steel UNS S31803 provides excellent resistance to seawater corrosion, chloride-induced pitting, crevice corrosion, and stress corrosion cracking, making it ideal for offshore and marine applications.
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 Seamless Tubes worldwide with export-standard packaging, complete documentation, and timely international delivery.
Kamal Steels offers ASTM-compliant Duplex Steel UNS S31803 Seamless Tubes with ready stock, certified quality, competitive pricing, stringent quality control, export-standard packaging, complete documentation, and dependable worldwide delivery for critical industrial applications.