S31803 Duplex Stainless Steel Tube
1. Standard: ASTM A789 / ASME SA789、ASTM A790 / ASME SA790、ASTM A928
2. Sizes: 1/2”- 24”
3. Outer Diameter: 6.0 - 630mm
4. Wall Thickness: 1mm - 50mm
S31803 Duplex Stainless Steel Tube has excellent corrosion resistance, much higher than Grade 316. It resists localized corrosion types such as intergranular, crevice and pitting. The CPT of these duplex steels is about 35°C. Gr 2205 grade resists chloride stress corrosion cracking (SCC) up to 150°C. Duplex F51 Stainless Steel is a suitable replacement for austenitic stainless steels, especially in premature failure environments and marine environments.
S31803 Duplex Stainless Steel Tube Standard：
- ASTM A790: Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe
- ASTM A789: Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service
- ASTM A928: Standard Specification for Ferritic/Austenitic (Duplex) Stainless Steel Pipe Electric Fusion Welded with Addition of Filler Metal
ASTM A789 UNS S31803 Tubing Specifications
| Specifications | ASTM A789 / ASME SA789 ASTM A790 / ASME SA790 |
| Seamless Tube | 1 / 2" NB – 8" NB |
| Welded Tube | 6" – 24" |
| Outer Diameter | 6.0mm – 630mm |
| Wall Thickness | 1mm – 50 mm |
| Schedules | SCH5, SCH20, SCH30, SCH40, STD, SCH60, SCH80, XS, SCH120, SCH140, SCH160, XXS |
| Length | Single Random, Double Random , Required Length |
| Packaging | Loose / Bundle / Wooden Pallet / Wooden box-a / Plastic Cloth Wraps / Plastic End Caps / Beveled Protector |
| Added Services | Draw / Expansion / Machining / Sand Blasting / Shot Blasting / Heat Treatment |
| Testing | Intergranular Corrosion Test, Weld Decay Test, Magnetic Particle Detection, Grain Size Test, Flare Test, Bend Test, Hardness Test, Tensile Test etc. |
UNS S31803 Tube, Chemical Composition and Mechanical Properties
| Trade Name | UNS | Duplex Industry Specifications | Chemical Composition | Min.Tensile (KSI) |
Min.Yield (KSI) |
Elongation % |
| SAF 2205 | UNS S31803 | A789, A790, A928 | C : 0.30 max Cr : 21.0-23.0 Mn: 2.00 max Mo: 2.50-3.50 N : 0.08-0.20 Ni : 4.50-6.50 P : 0.030 max S : 0.020 max Si : 1.00 max |
90 | 65 | 25 |
Duplex Stainless Steel 1.4462 Pipe Heat Resistance
The high oxidation resistance of the S31803 grade is compromised by its embrittlement above 300°C. This embrittlement can be reversed by full solution annealing.
ASME SA789 UNS S31803 Tube Applications
- Oil and Gas
- Chemical Processing
- Marine Industry
- Heat Exchangers
- Boilers
- Pressure Vessels
ASME SA789 S31803 Duplex Pipe Welding
S31803 Duplex Stainless Steel requires filler metal when welding. AS 1554.6 prequalifies 2205 and 2209 electrodes or rods for welding.
Duplex S31803 Pipe Heat Treatment
The most suitable heat treatment for UNS S31803 material is solution treatment (annealing) at 1020 - 1100°C followed by rapid cooling.
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