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Girgaon, Mumbai - 400004
Duplex Steel UNS S31803 Seamless Pipes Manufacturer in India
What arre Duplex Steel UNS S31803 Seamless Pipes?
Duplex Steel UNS S31803 Seamless Pipe is a duplex stainless steel pipe manufactured without a welded seam, providing a combination of austenitic and ferritic stainless steel properties. UNS S31803 offers high strength, good corrosion resistance and improved resistance to chloride-induced pitting, crevice corrosion and stress corrosion cracking compared with conventional austenitic stainless steel grades.
Duplex Steel UNS S31803 Seamless Pipes are commonly selected for demanding piping systems where high mechanical strength and corrosion resistance are required. They are used in oil and gas, chemical processing, petrochemical, marine, power generation, desalination and other industrial applications involving corrosive fluids and demanding service conditions.
Kamal Steels is a Duplex Steel UNS S31803 Seamless Pipe Manufacturer and Stockist in India, supplying pipes in different sizes, schedules, wall thicknesses, lengths, end preparations and surface finishes. Material Test Certificates, inspection documents, testing and export-standard packaging can be provided according to project and customer requirements.
Table of Contents
- Duplex Steel UNS S31803 Seamless Pipe Specifications
- UNS S31803 Seamless Pipe Weight Chart
- UNS S31803 Seamless Pipe Size Range
- ASTM A790 UNS S31803 Seamless Pipe
- UNS S31803 vs UNS S32205 Seamless Pipe
- Chemical Composition of UNS S31803 Seamless Pipe
- Mechanical Properties of UNS S31803 Seamless Pipe
- Features of UNS S31803 Seamless Pipes
- Duplex Steel UNS S31803 Seamless Pipe Applications
- Industries Using UNS S31803 Seamless Pipes
- Frequently Asked Questions
Duplex Steel UNS S31803 Seamless Pipe Specifications
Kamal Steels manufactures and stocks Duplex Steel UNS S31803 Seamless Pipes in accordance with internationally recognized ASTM, ASME and EN standards. Our seamless pipes are available in various outside diameters, wall thicknesses, schedules, and custom lengths to meet the requirements of offshore, marine, petrochemical, oil & gas, and chemical processing industries. Every pipe is manufactured under strict quality control procedures to ensure dimensional accuracy, superior mechanical properties, and long-term corrosion resistance.
| Product | Duplex Steel UNS S31803 Seamless Pipes |
|---|---|
| Material Grade | UNS S31803 / WNR 1.4462 |
| Standard | ASTM A790, ASTM A789, ASME SA790, ASME SA789 |
| Pipe Type | Seamless |
| Outside Diameter | ½" NB to 24" NB |
| Wall Thickness | SCH 5S to SCH XXS |
| Length | Single Random, Double Random, 6 Meter, Custom Cut Lengths |
| End Type | Plain End, Beveled End, Threaded End |
| Surface Finish | Annealed, Pickled, Polished |
| Testing | PMI, Hydrostatic Test, Ultrasonic Test, Eddy Current Test, Flattening Test, Flaring Test, Chemical & Mechanical Testing |
| Certification | EN 10204 3.1 / Mill Test Certificate |
UNS S31803 Seamless Pipe Weight Chart
The weight of Duplex Steel UNS S31803 Seamless Pipes depends on the outside diameter, wall thickness and pipe length. The following chart provides approximate theoretical weights for commonly used pipe sizes. Actual weight may vary according to dimensional tolerances, applicable manufacturing standards and supplied length.
| Nominal Pipe Size | Outside Diameter | Wall Thickness | Approx. Weight |
|---|---|---|---|
| 1/2" NB | 21.3 mm | 2.77 mm | 1.30 kg/m |
| 1" NB | 33.4 mm | 3.38 mm | 2.59 kg/m |
| 2" NB | 60.3 mm | 3.91 mm | 5.42 kg/m |
| 3" NB | 88.9 mm | 5.49 mm | 11.50 kg/m |
| 4" NB | 114.3 mm | 6.02 mm | 16.61 kg/m |
| 6" NB | 168.3 mm | 7.11 mm | 29.36 kg/m |
| 8" NB | 219.1 mm | 8.18 mm | 44.22 kg/m |
| 10" NB | 273.0 mm | 9.27 mm | 61.88 kg/m |
| 12" NB | 323.9 mm | 9.53 mm | 74.27 kg/m |
UNS S31803 Seamless Pipe Size Range
Kamal Steels manufactures Duplex Steel UNS S31803 Seamless Pipes in a wide range of sizes and dimensions for demanding industrial piping systems. Pipes can be supplied in different schedules, wall thicknesses and lengths to meet project requirements. Customized dimensions and cut lengths are also available according to customer drawings and specifications.
ASTM A790 UNS S31803 Seamless Pipe
ASTM A790 UNS S31803 Seamless Pipe is manufactured from Duplex Stainless Steel UNS S31803 for applications requiring a combination of high mechanical strength and corrosion resistance. ASTM A790 covers seamless and welded ferritic, austenitic and duplex stainless steel pipe intended for corrosive environments and demanding industrial service.
UNS S31803 is a duplex stainless steel grade with a two-phase austenitic-ferritic microstructure. It provides good resistance to chloride pitting, crevice corrosion and stress corrosion cracking, making ASTM A790 UNS S31803 Seamless Pipes suitable for demanding process, oil and gas, chemical, marine and water-treatment applications.
| Parameter | ASTM A790 UNS S31803 Seamless Pipe |
|---|---|
| Material Grade | Duplex Stainless Steel UNS S31803 |
| UNS Number | S31803 |
| Product Form | Seamless Pipe |
| Material Type | Duplex Stainless Steel |
| Specification | ASTM A790 / ASME SA790 |
| Microstructure | Austenitic-Ferritic Duplex |
| Corrosion Resistance | Good Resistance to Pitting, Crevice Corrosion and SCC |
| Typical Service | Corrosive and High-Strength Industrial Applications |
| Certification | Material Test Certificate Available as Required |
UNS S31803 vs UNS S32205 Seamless Pipe
UNS S31803 and UNS S32205 are duplex stainless steel grades with austenitic-ferritic microstructures and are widely used where high strength and corrosion resistance are required. UNS S32205 is commonly associated with the modern 2205 duplex grade and generally provides higher specified nitrogen and minimum mechanical strength requirements than the original S31803 chemistry.
The selection between UNS S31803 and UNS S32205 Seamless Pipe depends on the applicable material specification, chemical composition, mechanical-property requirements, corrosion conditions and project design requirements.
| Property | UNS S31803 | UNS S32205 |
|---|---|---|
| Material Type | Duplex Stainless Steel | Duplex Stainless Steel |
| Microstructure | Austenitic-Ferritic | Austenitic-Ferritic |
| Nominal Grade | Duplex 31803 | Duplex 2205 |
| UNS Number | S31803 | S32205 |
| Nitrogen | Lower specified range | Higher specified minimum |
| Mechanical Strength | High | Higher minimum strength requirements |
| Corrosion Resistance | Good | Very Good |
| Typical Selection | Duplex piping where S31803 requirements are specified | Modern duplex 2205 applications requiring higher specified strength and corrosion performance |
| Common Pipe Standard | ASTM A790 | ASTM A790 |
Chemical Composition of Duplex Steel UNS S31803
The carefully balanced chemical composition of Duplex Steel UNS S31803 provides its characteristic combination of high strength and exceptional corrosion resistance. Chromium, molybdenum and nitrogen significantly improve resistance to pitting and crevice corrosion, while nickel helps maintain the balanced duplex microstructure required for superior mechanical performance.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.03 Max |
| Manganese (Mn) | 2.00 Max |
| Silicon (Si) | 1.00 Max |
| Phosphorus (P) | 0.03 Max |
| Sulphur (S) | 0.02 Max |
| Chromium (Cr) | 21.0 – 23.0 |
| Nickel (Ni) | 4.5 – 6.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Nitrogen (N) | 0.08 – 0.20 |
| Iron (Fe) | Balance |
Mechanical Properties of Duplex Steel UNS S31803
Duplex Steel UNS S31803 offers significantly higher yield strength than conventional austenitic stainless steels while maintaining excellent toughness and ductility. These mechanical properties make it an ideal material for pressure-containing applications and heavy-duty industrial piping systems.
| Property | Value |
|---|---|
| Tensile Strength | 620 MPa Minimum |
| Yield Strength (0.2% Offset) | 450 MPa Minimum |
| Elongation | 25% Minimum |
| Hardness | 290 HB Max |
Equivalent Grades of Duplex Steel UNS S31803
| Standard | Equivalent Grade |
|---|---|
| UNS | S31803 |
| Werkstoff Number | 1.4462 |
| EN | X2CrNiMoN22-5-3 |
| AFNOR | Z3 CrNi 22.05 AZ |
| ASTM | A790 / A789 |
| ASME | SA790 / SA789 |
Duplex Steel UNS S31803 Seamless Pipe Applications
| Application | Typical Use |
|---|---|
| Process Piping | High-strength piping for corrosive process fluids and industrial services |
| Oil & Gas Piping | Production, gathering and process piping exposed to chloride-containing environments |
| Pressure Piping | High-pressure fluid-transfer systems where high mechanical strength is required |
| Heat Exchangers | Process piping and heat-transfer equipment exposed to corrosive fluids |
| Chemical Process Piping | Corrosive fluid handling and chemical process systems |
| Marine Piping | Marine equipment and piping exposed to seawater and chloride environments |
| Desalination Systems | Seawater intake, treatment and process piping applications |
| Water Treatment | Industrial water and corrosive fluid-handling systems |
Industries Using UNS S31803 Seamless Pipes
| Industry | Typical Applications |
|---|---|
| Oil & Gas | Process piping, production systems and corrosive fluid handling |
| Petrochemical | Process lines, pressure piping and plant equipment |
| Chemical Processing | Corrosive process piping and chemical fluid-transfer systems |
| Marine | Seawater piping, marine equipment and offshore systems |
| Power Generation | Selected process, cooling and utility piping systems |
| Desalination | Seawater intake, desalination and water-treatment piping |
| Water Treatment | Industrial water, wastewater and corrosive fluid-handling systems |
| Fertilizer | Chemical process piping and high-strength fluid-transfer systems |
| Mining | Slurry, process fluid and corrosive material-handling systems |
| Offshore Engineering | Corrosion-resistant piping and equipment for offshore facilities |
Frequently Asked Questions
Duplex Steel UNS S31803 Seamless Pipes are high-strength stainless steel pipes manufactured without a welded joint. They feature a balanced austenitic-ferritic microstructure, offering excellent resistance to pitting, crevice corrosion, chloride stress corrosion cracking, and superior mechanical strength for demanding industrial applications.
These seamless pipes are commonly manufactured in accordance with ASTM A790, ASTM A789, ASME SA790, and ASME SA789 standards, ensuring consistent quality, dimensional accuracy, and reliable performance.
Duplex Steel UNS S31803 offers nearly twice the yield strength of Stainless Steel 316 along with superior resistance to pitting, crevice corrosion, and chloride stress corrosion cracking. It also provides longer service life in aggressive chemical and marine environments.
These pipes are widely used in offshore platforms, oil & gas processing, petrochemical plants, chemical industries, desalination plants, marine engineering, pulp & paper mills, heat exchangers, pressure vessels, and water treatment facilities.
Duplex Steel UNS S31803 Seamless Pipes are available in various outside diameters, wall thicknesses, schedules, and custom lengths. Standard sizes generally range from ½" NB to 24" NB with schedules including SCH 5S, SCH 10S, SCH 40S, SCH 80S, XS, and XXS.
Quality inspections typically include Hydrostatic Testing, Positive Material Identification (PMI), Ultrasonic Testing, Eddy Current Testing, Chemical Analysis, Mechanical Testing, Dimensional Inspection, and Visual Examination to ensure compliance with international standards.
Yes. Due to their seamless construction and high mechanical strength, Duplex Steel UNS S31803 Seamless Pipes are well suited for high-pressure, high-temperature, and corrosive process systems where reliability and safety are critical.
Yes. Duplex Steel UNS S31803 provides excellent resistance to seawater corrosion, chloride attack, and stress corrosion cracking, making it a preferred material for offshore platforms, marine piping systems, and desalination plants.
Yes. Kamal Steels supplies Duplex Steel UNS S31803 Seamless Pipes with EN 10204 3.1 Mill Test Certificates, material traceability, inspection reports, and third-party inspection certificates upon customer request.
Kamal Steels is a trusted manufacturer and stockist of Duplex Steel UNS S31803 Seamless Pipes, offering certified materials, strict quality control, extensive ready stock, customized sizes, competitive pricing, complete documentation, and timely delivery to customers across India and international markets.