ASTM A213 TP321 Stainless Steel Seamless U bend Tubes For Heat Exchanger Bundles
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ASME SA213 / ASTM A213 specification covers seamless stainless steel and alloy steel boiler, superheater, and heat exchanger tubes of the T series.
GNEE provides SA213/A213 seamless stainless steel U-bend tubes, with TP321 U-bend tubes manufactured through a straight tube bending process. The bending is performed on an automatic U-bending machine using cold bending. To control wall thinning and ovality of the diameter during bending, a mandrel is inserted inside the tube. A213 TP321 seamless U-bend tubes allow the tube bundle to freely expand and contract with temperature changes without inducing stresses on the tube sheet or shell. This is crucial in applications with significant thermal cycling cycles, making them suitable for equipment such as heat exchangers and condensers.
ASTM A213 TP321 Stainless Steel Seamless U bend Tubes Chemical Composition
| C | Mn | P | S | Si | Cr | Ni | Ti |
| 0.08 | 2.00 | 0.045 | 0.03 | 1.00 | 17.0-19.0 | 9.0-2.0 | 5(C+N)-0.7 |
Mechanical Property UNS S32100 Seamless U bend Tubes
| Tensile Strength min. | Yield Strength min. | Elongation (%) | Hardness max | |
| 75ksi (515MPa) | 30ksi (205MPa) | 35min | 192HBW/200HV |
90 HRB |
Applications Industry
Heaters, coolers, condensers, and reboilers in Chemical & Petrochemical Processing.
Heat exchangers and pre-heaters in Oil & Gas Refining to processing hydrocarbons.
Feedwater heaters, condensers, and other heat recovery equipment in fossil fuel and nuclear plants.
Pharmaceutical and Food Processing
GNEE provides ASTM A213 TP321 stainless steel seamless U-bend tubes for heat exchanger bundles, manufactured from 17.0-19.0% chromium, 9.0-12.0% nickel, and 0.3-0.6% titanium with ultra-low carbon content (≤0.08%) to enhance intergranular corrosion resistance.
The TP321 stainless steel U-bend tubes feature precise dimensional tolerances (outer diameter ±0.05mm, wall thickness ±0.03mm), with outer diameters ranging from 12.7-38.1mm (1/2"-1.5") and wall thicknesses from 0.89-1.65mm (0.035"-0.065"). The standard U-bend radius is 1.5-3.0 times the tube diameter.
All tubes are supplied with mill test certificates (EN 10204 3.1) and optional third-party inspection reports, ensuring quality and traceability for high-performance heat exchange applications.
Test Required Bend U tube
1.Corrosion Test
2.Chemical Analysis
3.Mechanical Tests: Flattening test, Flaring test, Flange test, Hardness Test and Hydrostatic test
4.Reverse-bend and Reflat tests
5.Eddy Current Testing
6.Hydrostatic Testing
7.Air Under Pressure Test
8.Visual Inspection
Export ASME SA213 TP321 Stainless Steel U Tubes finished in Pickling Annealing. Size with Outside Diameter 20mm, Wall Thickness 1.6mm, Length from 7661mm – 8050mm. Total in 882KGS.
Package in Waterproof Paper bundles and put into Plywood Cases. TP321 Stainless Steel U Tubes Stainless Steel U Bend Tube Pictures as below:
