ASME SA213 TP304L Stainless Steel Seamless Heat Exchanger U Bend Tube For Refinery
ASTM A213/ASME SA213 TP304L stainless steel U bend tube is a seamless austenitic stainless steel tube, which has been bent into a U shape—normally a 180° bend with two straight legs—for use in shell-and-tube heat exchangers, condensers, boilers, superheaters, and similar equipment. TP304L provides superior intergranular corrosion resistance after welding or high-temperature exposure compared with standard TP304. ASTM A213 TP304L seamless U bend tubes are used where a pressure-tight, clean, corrosion-resistant heat-transfer tube is required. The tube is supplied in the solution-annealed condition, usually bright annealed or pickled and annealed, and then cold bent into a U shape. The straight legs are inserted into tubesheets and expanded or welded, while the U bend forms the return end of the tube bundle. ASTM A213 TP304L seamless U bend tube combines good corrosion resistance, formability, clean surface options, and reliable pressure tightness. Typical sizes are OD 6.35–88.9 mm, WT 0.5–12.7 mm, with bend radius normally ≥1.5D. Exact dimensions, tolerances, surface finish, testing, and U-bend geometry should always be confirmed against ASTM A213/A213M and the purchase drawing.
Chemical Composition:
| C |
Mn |
P |
S |
Si |
Cr |
Ni |
N |
| ≤0.030 |
≤2.00 |
≤0.040 |
≤0.030 |
≤0.75 |
18.00–20.00 |
8.00–12.00 |
≤0.10 |
Mechanical Properties:
| Tensile Strength, Rm |
≥485 MPa (70Ksi) |
| Yield Strength, Rp0.2 |
≥170 MPa (25Ksi) |
| Elongation (Longitudinal, 2 in / 50 mm gauge) |
≥35% |
| Hardness, HRB |
≤92 HRB |
| Hardness, HV |
≤200 HV |
Main Features of ASTM A213 TP304 Heat Exchanger U Bend Tubes:
Good general corrosion resistance
High-temperature performance
Excellent thermal conductivity
Good weldability
High formability and bendability
Good pressure tightness and uniform wall thickness
U-bend design accommodates thermal expansion and reduces tube joints
Typical Applications:
Shell-and-tube heat exchangers for power plants (auxiliary coolers, feedwater heaters)
Condensers in chemical, petrochemical and refinery process units (non-chloride process fluid)
Boiler superheater and reheater small U-loop transfer tubes
Heating & cooling exchangers for pharmaceutical, food and beverage processing
HVAC industrial heat exchangers, hot water heat exchangers
Solar thermal collector heat transfer assemblies
Oil & gas process heat exchangers for low-chloride service
Desalination auxiliary equipment
Pulp and paper heat recovery
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