A213/SA213 TP304L Bright Annealed (BA) Seamless Tube, Stainless Steel Heat Exchanger U Bend Tube
A213/SA213 TP304L Bright Annealed U-Bend Tube Overview
A213/SA213 TP304L Bright Annealed U-bend tubes are high-performance stainless steel tubes manufactured to ASTM A213/ASME SA213 standards using TP304L material—an austenitic stainless steel with low carbon content. These tubes undergo a bright annealing process in a controlled atmosphere to achieve a smooth, reflective surface finish and enhanced corrosion resistance.
The U-bend shape is specifically designed for use in heat exchangers, condensers, and boilers, where fluid direction changes within a compact footprint. The combination of TP304L's excellent weldability and corrosion resistance makes these tubes ideal for high-temperature and corrosive environments in industries such as petrochemical, power generation, and marine engineering.
Chemical Composition of SS304L (UNS S30403)
|
Element |
Content (%) |
|---|---|
|
Carbon (C) |
≤ 0.035 |
|
Manganese (Mn) |
≤ 2.00 |
|
Phosphorus (P) |
≤ 0.045 |
|
Sulfur (S) |
≤ 0.030 |
|
Silicon (Si) |
≤ 1.00 |
|
Chromium (Cr) |
18.0 – 20.0 |
|
Nickel (Ni) |
8.0 – 12.0 |
|
Nitrogen (N) |
≤ 0.10 |
|
Iron (Fe) |
Balance |
Mechanical Properties of SS304L (UNS S30403)
| Property | Value |
|---|---|
| Tensile Strength (min) | 485 MPa (70 ksi) |
| Yield Strength (min) | 170 MPa (25 ksi) |
| Elongation (min) | 35% |
| Hardness (max) | 90 HRB (Rockwell B) |
| Modulus of Elasticity | ~193 GPa (28 × 10⁶ psi) |
| Density | 8.0 g/cm³ |
| Melting Point | ~1400–1450 °C (2550–2640 °F) |
1. Key Features
· Material: TP304L (UNS S30403) – low carbon version of 304 stainless steel
· Process: Seamless, cold-worked, and bright annealed
· Finish: Bright, smooth, oxide-free internal and external surface
· Bend Radius: Customizable (typically 1.5×OD, 2×OD, etc.)
· Standards: ASTM A213 / ASME SA213
· Size Range: OD 6–38 mm; WT 0.5–3.0 mm; Lengths up to 30 meters (straight) before bending
2. Why Choose Bright Annealed (BA) tubes instead of Pickled Annealed (PA) tubes?
Choose Bright Annealed tubes when:
· You need high surface quality and cleanliness
· Corrosion resistance is a priority in critical environments
· Applications demand tight tolerances and aesthetics
Pickled annealed tubes are fine for more general-purpose industrial applications where surface finish isn't as critical.
3. Advantages
· Superior corrosion resistance, especially in chloride and acidic environments
· Smooth internal surface enhances fluid flow and reduces scaling
· High dimensional accuracy and mechanical strength
· Suitable for high-purity and high-temperature applications
4. Applications
· Heat exchangers
· Condensers
· Boilers and superheaters
· Power generation and petrochemical plants
· Pharmaceutical and food processing equipment
