ASTM A335 P9 Base Tube Composition
| Grade | UNS Designation | C | Mn | P | S | Si | Cr | Mo |
| P9 | K90941 | 0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.25-1.00 | 8.0-10.0 | 0.9-1.1 |
ASTM A335 P9 Serrated Fin Tube Strength
1. Material Strength Properties
- Tensile strength at room temp: min 415 MPa
- Yield strength at room temp: min 205 MPa
- Elongation: min 30%
- Hardness: max around 179 HB
- High-temperature properties: allowable stresses varying with temperature, creep rupture strength.
2. Versatility
- Wide Range of Applications: ASTM A335 P9 serrated fin tubes are used in various industries, including power generation, petrochemical, refining, and heat recovery systems.
- Customizable Design: The tubes can be customized in terms of base tube dimensions, fin height, fin density, and serration pattern to meet specific application requirements.
3. Cost-Effectiveness
- Long Service Life: The durability and resistance to high-temperature degradation reduce the need for frequent replacements, lowering long-term costs.
- Energy Efficiency: The enhanced heat transfer efficiency of serrated fin tubes can lead to energy savings in heat exchange systems.
4. Compliance with Industry Standards
- ASTM and ASME Standards: ASTM A335 P9 tubes comply with industry standards such as ASTM A335 and ASME SA335, ensuring high quality and reliability.
- Certifications: These tubes are often tested and certified for mechanical properties, hydrostatic performance, and non-destructive testing (NDT), providing assurance of their performance.
5. Improved Thermal Performance
- Higher Heat Transfer Coefficients: The serrated fin design results in higher heat transfer coefficients compared to smooth or plain fin tubes.
- Efficient Thermal Cycling: The tubes perform well under thermal cycling conditions, making them suitable for applications with fluctuating temperatures.
