ASTM A335 P11 HFW Serrated Type Finned Tube For HRSG Heat Recovery Steam System
ASTM A335 P11 HFW Serrated Type Finned Tube for HRSG Heat Recovery Steam System
Among our advanced products is the ASTM A335 P11 HFW Serrated Type Finned Tube, specifically designed for Heat Recovery Steam Generators (HRSG) and other high-performance heat recovery systems. This product is engineered to meet the rigorous demands of high-temperature and high-pressure environments, ensuring optimal heat transfer efficiency and durability.
Chemical Composition of ASTM A335 P11
(Source: ASTM A335-22, Table 1)
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.05 – 0.15 |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Silicon (Si) | 0.50 – 1.00 |
| Chromium (Cr) | 1.00 – 1.50 |
| Molybdenum (Mo) | 0.44 – 0.65 |
The alloying elements, particularly chromium (Cr) and molybdenum (Mo), provide excellent resistance to oxidation, thermal fatigue, and corrosion, making it suitable for high-temperature environments.
Mechanical Properties of ASTM A335 P11
(Source: ASTM A335-22, Table 2)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 415 MPa (60,200 psi) |
| Yield Strength | ≥ 205 MPa (30,000 psi) |
| Elongation | ≥ 30% |
| Hardness | ≤ 163 HB |
Base Tube Inspection (ASTM A335)
(Source: ASTM A335-22, Section 11)
- Hydrostatic Testing:
Each base tube is subjected to a hydrostatic test to verify its ability to withstand specified pressures without leakage. - Non-Destructive Testing (NDT):
- Ultrasonic or radiographic testing is performed to detect internal and surface defects.
- Dimensional Inspection:
- Outer diameter, wall thickness, and length are measured to ensure compliance with specified tolerances.
Finished Finned Tube Testing
-
Fin Bonding Test (Source: ASME SA803, Section 9.2):
- A pull-off test is conducted to verify the mechanical bond strength between the fins and the base tube.
- Acceptable fin pull-off strength is ≥ 80% of the tensile strength of the fin material.
-
Visual Inspection (Source: ASME SA803, Section 10):
- The surface is inspected for visible defects such as unbonded fins, weld imperfections, or deformation of the base tube.
-
Dimensional Accuracy (Source: TEMA Standards, Table RCB-2):
- Fin height, pitch, and thickness are measured to ensure compliance with design specifications.
Common Dimensions of Serrated Finned Tubes
| Parameter | Range |
|---|---|
| Base Tube OD | 25.4 mm – 50.8 mm (1" – 2") |
| Base Tube Thickness | 2.0 mm – 5.0 mm |
| Fin Height | 10 mm – 20 mm |
| Fin Pitch | 3 FPI – 10 FPI (Fins per Inch) |
| Fin Thickness | 0.5 mm – 1.2 mm |
| Tube Length | Up to 12 meters |
These dimensions can be customized to meet specific HRSG system requirements.
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