EN10217-7 1.4301 Extruded Finned Tubes With AL Fin For Wood Dryer
1. Material & Chemical Composition
Base Tube: EN10217-7 1.4301 (AISI 304) stainless steel, chosen for its excellent corrosion resistance and temperature stability—critical for wood dryer environments with high humidity and occasional chemical exposure.
Fins: High-purity aluminum (1050/3003 series), selected for superior thermal conductivity to enhance heat transfer efficiency.
Chemical composition of 1.4301 stainless steel (per EN10217-7):
Element
Content Range
Role in Performance
Chromium (Cr)
18.0-20.0%
Provides corrosion resistance
Nickel (Ni)
8.0-11.0%
Enhances ductility and oxidation resistance
Carbon (C)
≤0.07%
Controls strength and weldability
Manganese (Mn)
≤2.0%
Improves formability
Silicon (Si)
≤1.0%
Aids in oxidation resistance
Phosphorus (P)
≤0.045%
Minimized to avoid brittleness
Sulfur (S)
≤0.015%
Reduced to enhance corrosion resistance
2. Mechanical Properties
Engineered for the cyclic thermal stress of wood dryers, these tubes deliver robust mechanical performance:
Property
Value
Benefit for Wood Dryers
Tensile Strength
≥520 MPa
Resists deformation under pressure
Yield Strength
≥205 MPa
Maintains shape during thermal cycling
Elongation (in 50mm)
≥40%
Accommodates expansion from heat
Maximum Operating Temp
600°C (1112°F)
Withstands high heat in dryer chambers
3. Processing Technology
Our extruded finned tubes use a precision cold extrusion process:
Base Tube Preparation: 1.4301 stainless steel tubes are cleaned and precision-machined to ensure uniform outer diameter.
Fin Extrusion: Aluminum fins are mechanically extruded onto the base tube using specialized dies, creating a seamless bond with <0.01mm gap—minimizing thermal resistance.
Surface Treatment: Fins are deburred and tubes undergo passivation to enhance 1.4301’s natural corrosion resistance.
Quality Testing: 100% inspection for fin adhesion, dimensional accuracy, and pressure resistance (tested at 2.5x working pressure).
4. Performance & Application Scenarios
Heat Transfer Efficiency: The extrusion process ensures 99%+ contact between fins and base tube, boosting heat transfer by 35-45% compared to wrapped fins—critical for uniform wood drying (reducing drying time by 15-20% in tests).
Ideal for Wood Dryers: Specifically designed for:
Lumber dryers (hardwood/softwood)
Plywood/particleboard drying lines
Biomass-fueled or electric wood drying systems
Resists moisture, sap residues, and mild acids from wood.
5. Product Advantages
Superior Corrosion Resistance: 1.4301 stainless steel withstands humidity and wood-derived acids, eliminating rust issues common with carbon steel. Uniform Heat Distribution: Extruded fins ensure consistent heat transfer across the tube surface, preventing uneven wood drying (e.g., warping, cracking). Longevity: Aluminum fins resist oxidation; stainless steel base tube avoids pitting—service life ≥12 years in typical wood dryer operations. Energy Efficiency: Reduced thermal resistance lowers energy consumption, cutting operational costs.
6. FAQ
Q1: Can fin density be customized for different wood types?
A: Yes—we offer fin densities (fins per inch: 8-16) tailored to hardwood (slower drying) vs. softwood (faster drying) requirements.
Q2: Are these tubes compatible with high-humidity dryer environments?
A: Absolutely. 1.4301 stainless steel’s chromium content forms a protective oxide layer, resisting moisture-induced corrosion.
Q3: What tube sizes are available?
A: Standard outer diameters: 16mm-51mm; wall thickness: 1.5mm-3mm. Custom sizes available upon request.
7. About Yuhong Holding Group Co., Ltd
With 20 years of export expertise, Yuhong ranks among China’s top 5 finned tube exporters, serving 80+ countries. Our 55 production lines, 110+ skilled workers, and 20,000㎡ facility—equipped with advanced extrusion and testing equipment—ensure compliance with global standards (EN, ASTM, DIN). We specialize in finned tubes, boiler tubes, and heat exchanger solutions, prioritizing quality, on-time delivery, and 24/7 technical support.
