Applications of EN 10217-7 1.4301 Extruded Fin Tube with Al 1060 Fins in

The stainless steel grade 1.4301, as specified in the EN 10217-7 standard, derives its fundamental characteristics from its defined chemical composition and standard heat treatment condition. Its typical composition includes a maximum carbon (C) content of 0.07%, chromium (Cr) content between 17.5% and 19.5%, and nickel (Ni) content within the range of 8.0% to 10.5%. In the solution annealed (+AT) condition, it exhibits a room temperature thermal conductivity of approximately 16.3 W/(m·K), a specified proof strength (Rp0.2) of not less than 210 MPa, a tensile strength (Rm) ranging from 520 to 720 MPa, and an elongation after fracture (A) typically not below 40%. These fundamental physicochemical and mechanical property parameters form the basis for its engineering applications.

Based on these properties, finned tubes manufactured from this material demonstrate broad engineering applicability. Their use spans from process heat exchange and waste heat recovery in industries including petrochemicals, power generation, and metallurgy, to air heating equipment in civilian sectors such as Heating, Ventilation, and Air Conditioning (HVAC) and food drying. This wide range of applications stems from the 1.4301 (304) grade's reliable performance stability in common corrosive environments, satisfactory mechanical strength, and relatively economical cost, establishing it as a standardized selection for heat exchange components in numerous neutral and weakly corrosive oxidizing service conditions. It is important to note, however, that its susceptibility to stress corrosion cracking in chloride-rich environments constitutes a primary limitation for its application.

• High Efficiency and Energy-Saving Heat Transfer Core
  • Increased Heat Exchange Area: The fin structure can expand the effective heat exchange area by several to dozens of times compared to a bare tube, serving as a key enabler for enhanced heat transfer.
  • Improved Comprehensive Efficiency: When combined with forced convection (e.g., using fans), the heat transfer efficiency can be increased by a factor of 3 to 5 compared to natural convection. In practical industrial systems, replacing bare tubes with finned tubes can improve heat exchange efficiency by approximately 40% to 60%, leading to significant energy conservation and consumption reduction.
• Excellent Durability and Safety
  • Corrosion Resistance: Due to its composition of approximately 18% Chromium (Cr) and 8% Nickel (Ni), a dense chromium oxide film forms on the surface. This film provides effective resistance against corrosion from the atmosphere, water vapor, and various chemical media. In harsh environments like chemical processing, the service life of equipment using this material can be extended by 3 to 5 times compared to carbon steel equipment.
  • Good Mechanical and Fabrication Properties: The material offers a suitable combination of strength, plasticity, and toughness. Processes such as high-frequency welding can achieve a metallurgical bond between the fin and the base tube. This significantly reduces the contact thermal resistance, ensuring highly efficient heat conduction from the base tube to the fins.
  • Pressure Standard Compliance: The EN 10217-7 standard, being designated for pressure purposes, ensures the inherent safety and reliability of the base tube itself under pressure.
• Wide Adaptability
  • Strong Operational Condition Adaptability: It can maintain its properties within a temperature range of -196°C to 800°C (noting the sensitization range should be considered), adapting to pressure and flow variations in industries such as petrochemicals and power generation.
  • Strong Environmental Adaptability: It operates stably across diverse climates, from the dry cold of northern regions to the humid conditions of southern areas.
  • Hygienic and Aesthetic Qualities: Its smooth surface resists scaling, is easy to clean, and is also suitable for applications in food and pharmaceutical drying, as well as high-end building HVAC scenarios.