ASTM A213 TP321 / TP321H SS Seamless Boiler U Bend Tube
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ASTM A213 TP321 / TP321H SS Seamless Boiler U Bend Tube is a heat exchanger or boiler tube made from a titanium-stabilized austenitic stainless steel specified by ASTM A213. These tubes are seamless, meaning they are made without a weld, and are formed into a U-shape for use in heat exchange systems, boilers, and other high-temperature, corrosive applications. The addition of titanium in the 321/321H grades provides excellent resistance to intergranular corrosion and high-temperature oxidation, making them suitable for harsh environments.
What is the difference between ASTM A213 TP321 and TP321H U Bent Tube?
TP321 stainless steel seamless U-bend tubes exhibit excellent intergranular corrosion resistance due to titanium stabilization, while TP321H stainless steel U-bend tubes deliver superior high-temperature strength (tensile strength 515-795MPa, yield strength ≥205MPa), making them suitable for demanding boiler applications. Both grades are engineered to withstand thermal cycling and pressure fluctuations in boiler systems, ensuring reliable performance in power plants and high-temperature process industries.
ASME SA 213 TP321 TP321H Stainless Steel Tube Chemical Composition
| Grade | TP321 | TP321H | EN 10216-5 1.4541 |
| UNS Designation | S32100 | S32109 | |
| Carbon (C) Max. | 0.08 | 0.04–0.10 | 0.08 |
| Manganese (Mn) Max. | 2.00 | 2.00 | 2.00 |
| Phosphorous (P) Max. | 0.045 | 0.045 | 0.040 |
| Sulphur (S) Max. | 0.03 | 0.03 | 0.015 |
| Silicon (Si) Max. | 1.00 | 1.00 | 1.00 |
| Chromium (Cr) | 17.0–20.0 | 17.0–20.0 | 17.0-19.0 |
| Nickel (Ni) | 9.0–12.0 | 9.0–12.0 | 9.0–12.0 |
| Molybdenum (Mo) | - | - | |
| Nitrogen (N) | – | – | |
| Iron (Fe) | Bal. | Bal. | Bal. |
| Other Elements | Ti=5(C+N) to 0.70% | Ti=4(C+N) to 0.70% | Ti=5(C+N) to 0.70% |
ASTM A213 TP321 Stainless Steel Tubes Mechanical Properties
| Tensile Strength | Yield Strength | |||||||||
| Alloy | UNS | Spec | MPa | ksi | MPa | ksi | Elongation in 2 inches (min.) % | Grain Size Req. |
Harndess HBW max |
Hardness HV max |
| 321 | S32100 | ASME SA213 | 515 | 75 | 205 | 30 | 35 | - | 192 | 200 |
| 321H | S32109 | ASME SA213 | 515 | 75 | 205 | 30 | 35 | 7 or coarser | 192 | 200 |
SA213 TP321 TP321H Stainless Steel Physical Properties
| Alloy | UNS | Spec | Density kg/dm³ |
Modulus of Elasticity (x106 psi) | Mean Coefficient of Thermal Expansion (IN./IN./°F x 10-6) | Thermal Conductivity (BTU-in/ft2-h-°F) |
| 321 | S32100 | - | 7.93 | 29.0 | 9.2 | - |
| 321H | S32109 | - | 7.93 | 29.0 | 9.2 | - |
Apllication
Heat Exchangers: A critical component in various heat exchanger systems.
Boilers: Used in boiler plants and high-pressure steam pipelines.
Petrochemicals: Employed in petrochemical heat exchangers and other demanding environments.
Chemical Industry: Suitable for use in acid-resistant pipelines and chemical containers.
One of the largest manufacturer and supplier of stainless steel 321 /321H seamless U bend tubes. All our tubes are100% quality tested, which include chemical testing, mechanical testing as well as hydro testing. All ss 321 /321H Ubend Tubes are heat treated, solution annealed, and pass hydrostatic test and eddy current test
Each ss 321 /321H U bend tube of our range is quality checked by our quality team on every stage of production to deliver the clientsdefect free best quality products.
OD 95mm-38.1mm
WT up to 6.35mm
Bending radii 1.25 x OD up to 1700mm
Bends can be supplied in accordance with TEMA R / ASTM SA/A556
Leg length up to 15000mm
Heat treatment where reauired by electric furnance or direct resistance
All tubes are stress relieved after U-bending
Hydrotesting up to 10.000 psi
If you want to know more details and prices of the products, please contact us in time! Email: info@gneestainless.com
