ASME SA789 UNS S32205 duplex steel U-bend boiler tubes are U-shaped tubes made of 2205 duplex stainless steel in accordance with ASME SA789 standards. They are suitable for corrosion-resistant, high-strength applications in boilers, heat exchangers, and other demanding industries.
ASME SA789 UNS S32205 U-bends are manufactured by bending straight tubes and cold-bending them on an automatic U-bend machine. To ensure controlled wall thinning and diameter ovality, a mandrel is inserted into the tube during the bend. Furthermore, the U-bends are stress-relieved under controlled conditions and cycled for extended service life.
Hot-worked seamless UNS S32205 tubes are suitable for applications where dimensional accuracy and surface quality are less critical. UNS S32205 duplex steel U-bends maintain structural integrity and corrosion resistance in operating temperatures from cryogenic to 300°C (572°F). Its duplex (ferrite-austenite) structure resists thermal fatigue, ensuring reliability in high-frequency U-bend applications such as heat exchangers and power plants.
ASME SA789 UNS S32205 U-Bend Boiler Tube Specifications
| Sizes / Thickness | OD: 0.25"- 6" ; W.T: 0.02" - 0.5" or as required by clients | ||||
| Manufacture | Shall be made by the seamless or welded process with no filler metal added. | ||||
| Heat Treatment | For seamless tubes, as an alternate to final heat treatment in a continuous furnace or batch-type furnace, immediately following hot forming while the temperature of the tubes is not less than the specified minimum solution treatment temperature, tubes may be individually quenched in water or rapidly cooled by other means. S32205---(1020-1100℃) Quench:rapid cooling in air water |
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| Length | As required by clients | ||||
| Surface Condition | All tubes shall be free of excessive mill scale, suitable for inspection. A slight amount of oxidation will not be considered as scale. | ||||
| Bending Radius | From 1.5*OD(Outside Diameter) To 1500mm, ≤1.5*OD,necessary To agree precision of geometrics | ||||
| Straight Tubes | max length 35000mm | ||||
Chemical Composition UNS S32205
| Chemical Composition Max | C | Mn | P | S | Si | Ni | Cr | Mo | N |
| 0.03 | 2 | 0.03 | 0.02 | 1 | 4.5-6.5 | 22-23 | 3-3.5 | 0.14-0.2 |
Mechanical Property
| Steel Grade | Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation (%) | Hardness max |
| UNS S32205 | 655min | 485min | 25min |
290HBW 30 HRC |
Applications Industry
Pharmaceutical Equipment
Power Generation
Petrochemicals
Pressure Vessel
Heat Exchangers / Condensers / Boiler
Oil and Gas Processing
Specialty Chemicals
GNEE Stainless Steel is an independent stockist and fabricator of 2205 stainless steel heat exchanger tubing. With an extensive inventory and superior fabrication capabilities, we are able to meet the needs of most projects, whether it is stock product or custom fabrication.Email: info@gneestainless.com
Test Required Bend U tube
Corrosion Test
Chemical Analysis
Reverse-bend and Re. flat tests
Eddy Current Testing
Hydrostatic Testing
Visual Inspection
Mechanical Tests: Tension test, Flattening test, Flaring test, Flange test, Hardness Test and Hydrostatic test
Marking prescribed in specification A450/A 450M, The marking shall indicate whether the tubing is seamless or welded.
Mill test certificates will be issued according to EN10204.3.
All tubes shall be supplied as per applicable ASTM A789 /A789M Specification.
Packed in bundles or ply wooden box wrapped in plastic, and suitably protected for sea-worthily delivery or as requested.
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