ASTM A790 UNS S31803 Duplex Tube | Seamless Stainless Steel Tube
Technical Specifications
ASTM A790 S31803 Tube Specifications
|
Item
|
Specification
|
| Material Grade |
UNS S31803 |
| Material Type |
Duplex Stainless Steel |
| Standard |
ASTM A790 |
| Equivalent Grade |
Duplex 2205 |
| Manufacturing Type |
Seamless / Welded |
| Outer Diameter |
Customized according to requirements |
| Wall Thickness |
Customized according to requirements |
| Length |
Random Length / Fixed Length |
| Surface Finish |
Pickling, Annealing, Polishing (Optional) |
| Heat Treatment |
Solution Annealing |
| Testing |
Hydrostatic Test / NDT according to requirements |
| Application |
Industrial piping, heat exchanger, chemical equipment |
Chemical Composition
Chemical Composition of UNS S31803
|
Element
|
Typical Range
|
| Chromium (Cr) |
21.0–23.0% |
| Nickel (Ni) |
4.5–6.5% |
| Molybdenum (Mo) |
2.5–3.5% |
| Nitrogen (N) |
0.08–0.20% |
| Carbon (C) |
≤0.030% |
| Iron (Fe) |
Balance |
Mechanical Properties
Mechanical Properties of ASTM A790 S31803 Tube
|
Property
|
Requirement
|
| Tensile Strength |
≥620 MPa |
| Yield Strength |
≥450 MPa |
| Elongation |
≥25% |
| Hardness |
According to ASTM requirements |
Material Characteristics
Duplex Stainless Steel Structure
S31803 duplex stainless steel contains both ferritic and austenitic phases. This duplex structure provides:
1. High Mechanical Strength
Compared with conventional austenitic stainless steels, duplex stainless steel generally provides higher yield strength, allowing engineers to consider optimized wall thickness designs in suitable applications.
2. Corrosion Resistance
The combination of chromium, nickel, molybdenum and nitrogen provides resistance against various corrosive environments.
Suitable for applications involving:
· Chloride-containing environments
· Chemical processing media
· Marine atmosphere
· Industrial fluids
3. Engineering Flexibility
ASTM A790 S31803 tube is available in:
· Seamless tube
· Welded tube
· Different diameters
· Different wall thicknesses
· Customized lengths
Applications of ASTM A790 S31803 Tube
Oil and Gas Industry
Used for:
· Offshore piping systems
· Process piping
· Oil and gas transportation equipment
Chemical Processing
Applications include:
· Chemical reactors
· Heat exchangers
· Process pipelines
Marine Engineering
Used in:
· Seawater systems
· Marine equipment
· Offshore structures
Power Generation
Suitable for:
· Cooling systems
· Industrial heat exchanger systems
Industrial Equipment
Commonly used in:
· Pressure equipment
· Fluid transportation systems
Advantages of ASTM A790 S31803 Duplex Tube
ASTM Standard Compliance
Manufactured according to ASTM A790 requirements for duplex stainless steel seamless and welded tubes.
Duplex Stainless Steel Performance
The ferritic-austenitic structure provides a combination of mechanical strength and corrosion resistance for industrial applications.
Flexible Manufacturing Options
Available with:
· Seamless production
· Welded production
· Customized OD and wall thickness
· Various surface treatments
Traceable Material Documentation
Supply can include:
· Material Test Certificate (MTC)
· Chemical composition report
· Mechanical test records
·Inspection documents according to project requirements
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