ASTM A335 P11 Helical Serrated Fin Tube with 11-13Cr Fins For Power Generation
ASTM A335 P11 Helical Serrated Fin Tube with 11-13Cr Fins For Power Generation
Product Overview
Our ASTM A335 P11 helical serrated fin tubes with 11-13Cr fins are high-performance alloy steel heat transfer components professionally engineered for extreme high-temperature and high-pressure industrial environments. The base tube adopts premium ASTM A335 P11 seamless chromium-molybdenum alloy steel (1.25Cr-0.5Mo), featuring stable mechanical properties at elevated temperatures, excellent thermal fatigue resistance and creep resistance. Equipped with premium 11-13Cr stainless steel serrated helical fins, this fin tube integrates optimized structural design and superior material performance to deliver outstanding heat exchange efficiency and long-term service stability, serving as an ideal core component for industrial boilers, heat exchangers and heating furnace systems.
Different from ordinary solid fin tubes, the helical serrated structure effectively disrupts the fluid boundary layer and generates micro-turbulence on the heat transfer surface, greatly improving heat exchange efficiency compared with traditional smooth fin tubes. The 11-13Cr fin material provides exceptional high-temperature oxidation resistance and corrosion resistance, perfectly adapting to harsh working conditions with flue gas corrosion, high temperature oxidation and variable load operation.
Detailed Breakdowns:
1. Base Tube:
The specific alloying elements give ASTM A335 P11 its high-temperature strength and corrosion resistance. Below is the required chemical composition by weight percentage.
(1) The Chemical Composition of ASTM A335 P11
| Element | Composition (by weight) |
| 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% |
(2) The Mechanical Properties of ASTM A335 P11
The P11 grade is specified to maintain its strength and toughness at elevated temperatures. The standard mechanical properties are:
| Property | Value (Minimum) |
| Tensile Strength | 415 MPa (60,000 psi) |
| Yield Strength | 205 MPa (30,000 psi) |
| Hardness | ≤ 163 HBW(or ≤ 89 HRB |
Key Characteristics of the ASTM A335 P11 seamless base tube: High-temperature resistance up to ~540°C, good creep strength, and oxidation resistance. Suitable for high-pressure applications.
2. Fins: "11-13Cr" Fins
(Alloy steel with 11-13% Chromium)
Matches the base tube's corrosion and oxidation resistance to prevent galvanic corrosion. Provides cost-effectiveness compared to stainless steel while maintaining performance in moderately corrosive flue gases.
Core Product Advantages
- Premium Dual Material Matching: The base tube is made of standard ASTM A335 P11 ferritic alloy steel, which can withstand long-term operation at 540℃-750℃ high temperature and 30MPa+ high pressure without deformation or failure. The 11-13Cr high-chrome fins enhance high-temperature anti-oxidation and anti-corrosion capabilities, effectively resisting flue gas erosion and medium corrosion in petrochemical and power generation scenarios.
- Optimized Helical Serrated Structure: The continuous helical winding and integral serrated design maximizes the heat transfer contact area. The serrated gaps destroy the laminar flow boundary layer of the fluid, significantly improve the turbulence effect, and increase the comprehensive heat transfer efficiency by 25%-40% compared with conventional solid fin tubes, realizing more energy-saving and efficient heat exchange.
- Superior Structural Firmness & Durability: Adopts advanced high-frequency welding integral forming process, with tight combination of fins and base tube, high bonding strength, no shedding or loosening under high-temperature thermal cycling and vibration conditions. The overall structure features high rigidity, strong pressure resistance and long service life, reducing equipment maintenance and replacement costs.
- Strict Standard Production & Wide Adaptability: Manufactured in full compliance with ASTM A335 international standards, with stable chemical composition and uniform mechanical properties. The product supports customized fin pitch, fin height, tube diameter and length, meeting the differentiated configuration requirements of various industrial heat exchange equipment.
Application
This P11 helical serrated fin tube with 11-13Cr fins is widely applicable to harsh high-temperature industrial heat exchange systems, mainly including:
- Power plant boiler superheaters, reheaters and air preheaters;
- Petrochemical refinery heating furnace convection sections, heat exchanger bundles and crude oil heating equipment;
- Chemical industry high-temperature reaction heat exchange devices;
- Metallurgical high-temperature flue gas waste heat recovery systems and other industrial fields requiring efficient and stable heat transfer.
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