SA213 TP304L Stainless Steel U Bend Boiler Tube For Hot Water Boilers And Condensers

ASME SA213 TP304L U-Bend Boiler Tube – Applications & Key Features

SA213 TP304L is a low-carbon austenitic stainless steel (18% Cr, 8% Ni, low C) used in U-bend boiler tubes for high-corrosion resistance and flexibility in heat exchangers.

Primary Applications
1. Heat Exchangers & Condensers

• Shell & tube heat exchangers (U-bends allow thermal expansion).
• Surface condensers in power plants (resists steam/condensate corrosion).

2. Boilers & Superheaters

• Recovery boilers (handles flue gas condensates).
• Low-pressure steam boilers (where chloride stress corrosion is a concern).

3. Petrochemical & Refining

• Reboilers, feedwater heaters (resists acidic/alkaline conditions).
• Refinery heat recovery systems (exhaust gas applications).

4. Food & Pharmaceutical Processing

• Sanitary heat exchangers (non-reactive, easy to clean).

5. Marine & Desalination

• Desalination plant tubing (resists saltwater pitting/crevice corrosion).

Why Use SA213 TP304L U-Bend Tubes?

✔ Excellent corrosion resistance (vs. carbon steel in acidic/chloride environments).
✔ Low carbon content (0.03% max) – prevents sensitization & intergranular corrosion.
✔ Good weldability – no post-weld heat treatment required.
✔ High ductility – U-bends withstand thermal expansion stresses.
✔ Oxidation resistance up to ~800°C (1472°F).

Comparison with Other Grades

Common FAQs
1. Can TP304L handle high-pressure steam?

• Yes, but for >500°C (932°F), TP321/TP347 is preferred due to better creep strength.

2. Why U-bend instead of straight tubes?

• Absorbs thermal expansion (reduces stress on tube sheets).
• Compact design (saves space in heat exchangers).

3. How to prevent stress corrosion cracking (SCC)?

• Avoid chloride exposure >60°C (140°F).
• Use TP316L if chlorides are present.

4. What’s the max operating temperature?

• Continuous: ~800°C (1472°F) (oxidizing environments).
• For pressure service: ~425°C (797°F) per ASME limits.

5. How to inspect U-bend tubes?

• Dye penetrant (PT) for surface cracks.
• Radiography (RT) for internal defects.
• Need Custom Specifications
• Bend radius: Standard (1.5D–3D) or custom.
• Finishing: Pickling/passivation for enhanced corrosion resistance.
• Certification: EN 10204 3.1 / MTC with PMI test reports.

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