ASTM A790 S31803 Duplex 2205 Welded Pipe For Corrosive Service
ASTM A790 S31803 Duplex 2205 Welded Stainless Steel Pipe
Product Overview
ASTM A790 S31803 Duplex 2205 Welded Stainless Steel Pipe is a ferritic-austenitic duplex stainless steel pipe designed for corrosive process piping and demanding industrial service. Manufactured from UNS S31803 duplex stainless steel, it combines high mechanical strength with good resistance to general corrosion and chloride-containing environments.
The welded construction is suitable for applications requiring controlled longitudinal weld quality, customized pipe dimensions and larger outside diameters. The pipe can be supplied with solution annealing, pickling, dimensional inspection and project-specific testing according to applicable ASTM A790/A790M and purchase order requirements.
Duplex 2205 S31803 is widely considered for oil and gas, petrochemical, chemical processing, marine, power generation and industrial water systems where conventional stainless steel or carbon steel may not provide the required combination of strength and corrosion resistance.
Technical Specifications
| Item |
Specification |
| Product Name |
Duplex 2205 Welded Stainless Steel Pipe |
| Material Grade |
UNS S31803 |
| Common Grade |
Duplex 2205 |
| Material Type |
Ferritic-Austenitic Duplex Stainless Steel |
| Material Standard |
ASTM A790 / ASME SA790 |
| Manufacturing Method |
Automatic Longitudinal Welding |
| Pipe Type |
Straight Seam Welded Pipe |
| Heat Treatment |
Solution Annealed |
| Surface Condition |
Annealed & Pickled / Customized |
| Outside Diameter |
Customized |
| Wall Thickness |
Customized |
| Length |
Fixed / Random / Customized |
| End Preparation |
Plain / Beveled / Customized |
| Dimension Standard |
ASME B36.19 / Project Specification |
| Inspection |
Hydrostatic / Nondestructive / Dimensional |
| PMI |
Available |
| MTC |
EN 10204 3.1 / 3.2 |
| Third-Party Inspection |
Available Upon Request |
Material: UNS S31803 Duplex 2205
UNS S31803 is a duplex stainless steel grade commonly identified with the Duplex 2205 family. Its ferritic-austenitic microstructure provides a balance of strength and corrosion resistance that differs from conventional austenitic grades such as 304L and 316L.
The alloying system containing chromium, nickel, molybdenum and nitrogen contributes to its resistance to chloride-containing environments and stress corrosion cracking. S31803 is therefore frequently selected for process piping where both mechanical strength and corrosion resistance are important design considerations.
Product Features
- Duplex Ferritic-Austenitic Structure: The duplex microstructure provides a combination of mechanical strength and corrosion resistance for demanding industrial piping systems.
- Good Chloride Corrosion Resistance: S31803 Duplex 2205 is commonly selected for piping exposed to chloride-containing fluids and other corrosive process environments.
- Resistance to Stress Corrosion Cracking: Duplex stainless steel offers improved resistance to chloride stress corrosion cracking compared with many conventional austenitic stainless steel grades.
- High Mechanical Strength: The mechanical strength of Duplex 2205 is higher than that of many conventional austenitic stainless steels, making it suitable for pressure piping and process systems where strength is an important consideration.
- Controlled Welded Construction: Automatic longitudinal welding provides a controlled weld seam and allows production of larger pipe diameters and customized wall thicknesses.
- Customizable Supply: Pipe outside diameter, wall thickness, length, end preparation, surface condition, inspection and documentation can be supplied according to project requirements.
Manufacturing Process
The typical production process for ASTM A790 S31803 welded pipe includes:
- Duplex stainless steel plate or strip preparation
- Raw material identification and chemical verification
- Plate or strip forming
- Controlled longitudinal welding
- Weld seam inspection
- Solution heat treatment
- Pickling and surface treatment
- Cutting to specified length
- End preparation
- Dimensional inspection
- Hydrostatic or applicable nondestructive testing
- PMI and final inspection
- Marking and export packaging
The actual production route and testing scope are controlled according to the applicable standard, purchase specification and agreed inspection plan.
Applications
- Oil & Gas: Used in selected process, production and utility piping systems where corrosive fluids and chloride-containing environments may be encountered.
- Petrochemical Plants: Suitable for process piping in refineries and petrochemical facilities requiring duplex stainless steel construction.
- Chemical Processing: Applied to selected chemical process lines where corrosion resistance and mechanical strength are required.
- Marine & Seawater Systems: Considered for marine piping, cooling-water systems and selected seawater-related applications, subject to actual service conditions.
- Power Generation: Used in selected cooling water, process water and auxiliary piping systems in power plants.
- Industrial Process Piping: Suitable for industrial fluid transportation systems requiring a combination of strength, corrosion resistance and welded pipe construction.
Typical Service Media
Note: Material suitability should be evaluated according to the actual medium, chloride concentration, temperature, flow velocity and operating conditions.
ASTM A790 S31803 Welded Pipe vs. Seamless Pipe
ASTM A790 covers both seamless and straight-seam welded duplex stainless steel pipe. Welded pipe is produced by forming plate or strip and creating a controlled longitudinal weld. It can be advantageous for larger outside diameters and certain customized dimensions. Seamless pipe is manufactured without a longitudinal weld and may be selected for specific pressure, size or project requirements. The choice between welded and seamless construction should be based on pipe dimensions, service conditions, design requirements and the applicable project specification.
S31803 vs. S32205 Duplex 2205
| Item |
S31803 |
S32205 |
| Common Name |
Duplex 2205 |
Duplex 2205 |
| UNS Designation |
S31803 |
S32205 |
| Material Family |
Duplex Stainless Steel |
Duplex Stainless Steel |
| Structure |
Ferritic-Austenitic |
Ferritic-Austenitic |
| Typical Cr-Ni-Mo System |
22Cr-5Ni-3Mo class |
22Cr-5Ni-3Mo class |
| Typical Applications |
Corrosive Process Piping |
Corrosive Process Piping |
Although S31803 and S32205 are both commonly associated with Duplex 2205, they have different chemical composition requirements. They should not be treated as automatically interchangeable. The exact UNS grade specified in the purchase order should always be followed.
Related Material Designations
| Standard / System |
Designation |
| UNS |
S31803 |
| Common Grade |
Duplex 2205 |
| ASTM |
A790 S31803 |
| ASME |
SA790 S31803 |
| EN |
1.4462 |
| EN Reference |
X2CrNiMoN22-5-3 |
| JIS Reference |
SUS329J3L |
Related designations should be verified against the applicable material standard and chemical/mechanical requirements before being treated as exact equivalents.
Inspection & Testing
Quality inspection can be arranged according to ASTM A790/A790M and project-specific requirements. Typical inspection options include:
- Chemical Composition Analysis
- Tensile Testing
- Hardness Testing
- Flattening Test
- Hydrostatic Testing
- Nondestructive Electric Testing
- Weld Seam Inspection
- Ultrasonic Testing When Specified
- Positive Material Identification (PMI)
- Dimensional Inspection
- Visual Inspection
- Surface Inspection
- Third-Party Inspection
Surface Treatment
ASTM A790 S31803 welded pipe can be supplied with a surface condition suitable for the manufacturing process and project requirements. Common options include:
- Solution Annealed & Pickled
- Annealed & Pickled
- Mechanically Treated Surface
- Customized Surface Finish
Surface requirements should be confirmed according to the pipe dimensions, manufacturing route and project specification.
End Preparation
Pipe ends can be supplied according to the customer's piping and welding requirements. Available options include:
- Plain End
- Beveled End
- Square Cut End
- Customized End Preparation
Quality Documents & Certifications
The following documents can be provided according to the purchase order and inspection plan:
- EN 10204 3.1 Material Test Certificate
- EN 10204 3.2 Certificate Upon Request
- Chemical Analysis Report
- Mechanical Test Report
- Hydrostatic Test Report
- NDT Report
- PMI Report
- Dimensional Inspection Report
- Heat Treatment Record
- Packing List
- Certificate of Origin
- Third-Party Inspection Report
Packaging
ASTM A790 S31803 welded pipes are normally supplied with protective end caps and securely bundled according to pipe size and transportation requirements. Plastic wrapping, steel strapping and seaworthy export packaging can be arranged for long-distance shipment.
Custom Manufacturing & Supply
We can supply ASTM A790 S31803 Duplex 2205 welded pipe with customized:
- Outside Diameter
- Wall Thickness
- Pipe Length
- End Preparation
- Surface Condition
- Heat Treatment
- Inspection Requirements
- PMI Requirements
- NDT Requirements
- Third-Party Inspection
- Material Certification
Technical drawings, project specifications and inspection plans can be reviewed before production to confirm the applicable requirements.
Frequently Asked Questions
- What is ASTM A790 S31803 pipe?
ASTM A790 S31803 pipe is duplex stainless steel pipe manufactured to ASTM A790/A790M requirements. UNS S31803 is commonly associated with Duplex 2205 stainless steel.
- Is ASTM A790 S31803 pipe welded or seamless?
ASTM A790 covers both seamless and straight-seam welded pipe. The product description should clearly specify whether the supplied pipe is welded or seamless.
- Is S31803 the same as Duplex 2205?
S31803 is commonly identified as Duplex 2205. However, S31803 and S32205 have different chemical requirements, so the specified UNS grade should be confirmed for each project.
- What is ASTM A790 S31803 welded pipe used for?
It is commonly used in oil and gas, petrochemical, chemical processing, marine, power generation and industrial process piping applications.
- Can S31803 welded pipe be supplied with PMI?
Yes. Positive Material Identification (PMI) can be arranged when required by the purchase order or inspection plan.
- Can third-party inspection be arranged?
Yes. Third-party inspection can be arranged according to the agreed inspection scope and project requirements.
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