Yuhong Group Co.,Ltd
Yuhong Holding Group Co.,LTD
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ASME SA213 TP444 Stainless Steel U Bend Heat Exchanger Tube
Introduction
The ASME SA213 TP444 is a ferritic stainless steel tube designed for high-temperature and corrosive environments, commonly used in heat exchangers, boilers, and superheaters. The U-bend design allows for thermal expansion and efficient heat transfer in shell-and-tube heat exchangers.
Material Specifications
Standard: ASME SA213 (Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes)
Grade: TP444 (A ferritic stainless steel with improved corrosion resistance)
UNS Designation: S44400
Chemical Composition
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 17.5 - 19.5 |
| Molybdenum (Mo) | 1.75 - 2.50 |
| Nickel (Ni) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Carbon (C) | ≤ 0.025 |
| Nitrogen (N) | ≤ 0.035 |
| Titanium (Ti) / Niobium (Nb) | Stabilized (for improved corrosion resistance) |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 415 MPa (60 ksi) |
| Yield Strength | ≥ 275 MPa (40 ksi) |
| Elongation | ≥ 20% |
| Hardness (Rockwell B) | ≤ 90 HRB |
Key Features & Advantages
Excellent Corrosion Resistance – Resists pitting, crevice corrosion, and stress corrosion cracking (SCC) in chloride environments.
High-Temperature Performance – Suitable for heat exchangers operating in elevated temperatures.
Ferritic Structure – Magnetic, with good resistance to oxidation and scaling.
Stabilized with Ti/Nb – Prevents sensitization and intergranular corrosion.
U-Bend Design – Allows thermal expansion, reduces stress, and improves heat transfer efficiency.
Applications
Shell-and-tube heat exchangers
Condensers & evaporators
Power plant boilers & superheaters
Chemical processing equipment
Oil & gas refineries
Manufacturing & Testing
Seamless construction (cold-drawn or hot-finished)
U-bend forming (cold bending with precise radius)
Non-destructive testing (NDT) (Eddy current, hydrostatic, ultrasonic)
Heat treatment (Annealed for optimal corrosion resistance)
Comparison with Other Grades
| Grade | Type | Key Difference |
|---|---|---|
| TP304/TP316 | Austenitic | Higher Ni content, better toughness |
| TP430 | Ferritic | Lower Mo, less corrosion resistance |
| TP444 | Ferritic | Higher Mo & stabilization, better chloride resistance |
Conclusion
The ASME SA213 TP444 U-bend tube is ideal for corrosive and high-temperature heat exchanger applications, offering superior chloride resistance compared to standard ferritic grades. Its U-bend design enhances thermal performance while minimizing mechanical stress.
