ASME SA213 T11 T12 ALLOY STEEL SEAMLESS TUBE FOR HAIRPIN HEAT EXCHANGERS
YUHONG T11 and T22 alloy tubes are special alloy steel tubes used in high temperature and high pressure applications, primarily in boilers, heat exchangers, and other applications requiring high temperature and pressure resistance.
They are briefly summarized below: About high Temperature Resistance, both alloys are suitable for high temperature environments, but T22 performs better at extreme temperatures. For corrosion resistance: Both have excellent corrosion resistance and perform well in many industrial applications. The choice between T11 and T22 is based on the specific temperature, pressure requirements and budget.
T11&T22 Alloy Steel Seamless Tube Chemical Composition
| Grade | C≤ | Mn | P≤ | S≤ | Si≤ | Mo |
| T11 | 0.05~0.15 | 0.30~0.60 | 0.025 | 0.025 | 0.50~1.0 | 0.44~0.65 |
| Grade | C≤ | Mn | P≤ | S≤ | Si≤ | Mo |
| T22 | 0.05~0.15 | 0.30~0.60 | 0.025 max | 0.025 max | 0.50 max | 0.87~1.13 |
Alloy Steel T11&T22 Seamless Tubes Mechanical Properties
| Grade | Tensile Strength, MPa | Yield Strength, MPa | Elongation, % | Hardness, HB |
| T11 | 415 min | 205 min | 30 min | 179 max |
| Grade | Tensile Strength, MPa | Yield Strength, MPa | Elongation, % | Hardness, HB |
| T22 | 415 min | 220 min | 30 min | 163 max |
Alloy Steel Seamless Seamless Tube Outside Diameter and Tolerance
| Outside Diameter | OD Tolerance | WT Tolerance | Ovality Tolerance | Cut Length Tolerance |
| OD≤ 12, 7 mm | ± 0, 13 mm | ± 15 % | – | + 3, 18 mm, – 0 mm |
| 12, 7 mm < OD ≤ 38, 1 mm | ± 0, 13 mm | ± 10 % | max, 1, 65 mm | + 3, 18 mm, – 0 mm |
| 38, 1 mm < OD ≤ 88, 9 mm | ± 0, 25 mm | ± 10 % | max, 2, 41 mm | + 4, 76 mm, – 0 mm |
(picture shows the u bend tube bundle of hair pin heat exchangers)
The use of alloy tubes in hairpin heat exchangers (also known as U-type heat exchangers or U-tube heat exchangers) is of great significance, and the following are a few of their key aspects:
1. Overview of hairpin heat exchangers
A hairpin heat exchanger consists of a series of U-shaped or hairpin-shaped tubes in which a fluid flows inside the tube and exchanges heat with another fluid outside the tube. This design allows the heat exchanger to have a high heat transfer efficiency and a small footprint, and is suitable for environments with high temperature, high pressure or corrosive media.
2. Material Advantages
Alloy tube materials such as stainless steel, nickel-based alloys and copper alloys are widely used in hairpin heat exchangers because of their superior physical and chemical properties:
High Temperature Resistance: Alloy tubes are able to withstand the high temperature operating conditions commonly found in hairpin heat exchangers, ensuring the safety and stability of the equipment.
Corrosion resistance: when dealing with chemical or corrosive fluids, the corrosion resistance of alloy tubes significantly improves the life and reliability of the heat exchanger and reduces maintenance costs.
3. Heat exchange efficiency
The higher thermal conductivity and hydrodynamic properties of alloy tubes enable hairpin heat exchangers to achieve higher efficiency in the heat exchange process. The smoothness of the inner wall of the alloy tube reduces fluid resistance and optimizes flow, further improving heat transfer efficiency.
Alloy Steel Seamless Tubes Application Industries
- Off-Shore Oil Drilling Companies
- Power Generation
- Petrochemicals
- Gas Processing
- Specialty Chemicals
- Pharmaceuticals
- Pharmaceutical Equipment
- Chemical Equipment
- Sea Water Equipment
- Heat Exchangers
- Condensers
