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The ASTM A213 T9 Alloy Steel HFW Fin Tube is a specialized tube designed for use in convection heat exchangers under high-pressure situations. Manufactured from T9 alloy steel (a chrome-molybdenum alloy steel), this tube is specifically engineered for high-performance heat transfer in applications like power plants, boilers, and furnaces. The high-frequency welding (HFW) process ensures the attachment of metallic fins to the base tube, improving heat dissipation and efficiency in high-temperature and high-pressure environments, such as those found in convection heating systems.
ASTM A213 T9 is a chromium-molybdenum alloy steel, known for its outstanding high-temperature strength and creep resistance, making it ideal for applications exposed to high pressures and temperatures.
The material is commonly used in superheaters, economizers, and convection heat exchangers due to its ability to withstand extreme thermal and mechanical stresses.
T9 alloy steel provides high resistance to oxidation and thermal fatigue, ensuring long-term reliability and durability in demanding high-pressure systems.
The high-frequency welding (HFW) process is used to bond metal fins to the base tube, ensuring a strong and durable attachment. This process provides superior mechanical integrity under high-temperature and high-pressure conditions.
The HFW fin tube design increases the heat transfer area, improving the overall performance of convection heat exchangers.
| Element | ASTM A213 T9 Alloy Steel (Base Tube) |
|---|---|
| Carbon (C) | 0.08% - 0.15% |
| Manganese (Mn) | 0.30% - 0.60% |
| Chromium (Cr) | 2.25% - 2.75% |
| Molybdenum (Mo) | 0.90% - 1.10% |
| Phosphorus (P) | ≤ 0.025% |
| Sulfur (S) | ≤ 0.025% |
| Property | ASTM A213 T9 Alloy Steel (Base Tube) |
|---|---|
| Tensile Strength | 415 MPa (min) |
| Yield Strength | 205 MPa (min) |
| Elongation | ≥ 30% |
| Hardness | Brinell hardness: 170 - 210 HB |
Superior High-Temperature Resistance:
The T9 alloy steel offers exceptional creep resistance and high-temperature oxidation resistance, making it ideal for use in convection heat exchangers and furnaces under extreme conditions.
Enhanced Heat Transfer Efficiency:
The HFW (high-frequency welding) fin tube design increases the heat transfer surface area, making it more efficient in transferring heat from the working fluid to the environment, which is essential in high-pressure heat exchangers.
Corrosion Resistance:
Aluminum fins offer excellent corrosion resistance and are well-suited for high-temperature, steam, and flue gas exposure, while stainless steel fins provide long-term durability and strength in aggressive environments.
Durability and Strength:
The mechanically bonded fins and HFW construction ensure that the tube-finned structure will maintain its integrity even in harsh conditions, such as thermal cycling and mechanical stresses.
Cost-Effective and Reliable:
The combination of high-frequency welding and carbon steel base tubes provides a cost-effective solution that doesn't compromise on thermal performance or reliability in demanding high-pressure applications.
Convection Heat Exchanger Tubes: Ideal for use in high-pressure applications in power plants, boilers, superheaters, and furnaces.
Furnace and Heat Recovery: Used in furnaces and waste heat recovery systems where efficient heat exchange is required under high-pressure conditions.
Industrial Cooling Systems: Used in high-temperature cooling systems in petrochemical plants, oil refineries, and other industrial settings requiring reliable heat dissipation.
