Rolled Fin Stainless Steel Tubes for Severe-Duty Heat Exchangers
Engineered for high-efficiency heat recovery, chemical processing units, and air-cooled heat exchangers, our rolled fin stainless steel tubes feature mechanically cold-formed fins integrated directly from an outer sleeve or parent tube. This cold-rolling process establishes a permanent metallic bond between the base tube and fins, eliminating thermal contact degradation under cyclic temperatures up to 400°C. Built from corrosion-resistant austenitic and duplex stainless steel grades, these tubes provide reliable thermal performance in aggressive industrial environments.
Product Types
L-Foot Tension Wrapped Finned Tubes:
Formed by mechanically wrapping pre-shaped L-foot fin strips under tension around the stainless steel base tube, securing tight contact against atmospheric oxidation.
Extruded Bimetallic Finned Tubes:
Consisting of an inner stainless steel carrier tube encased within an outer aluminum muffle that is cold-rolled to form high-integrity fins, combining chemical resistance with high thermal conductivity.
Integral Rolled Fin Tubes:
Manufactured by cold-forming fins directly out of the outer wall of a thick-walled stainless steel mother tube, ensuring zero joint resistance and maximum structural strength.
Embedded (G-Fin) Finned Tubes:
Fin strips mechanically embedded into a pre-cut helical groove on the outer surface of the stainless steel tube and locked in place under roller pressure.
Technical Specifications
| Parameter | Standard Specification Range | Up to 12,000 mm |
| Base Tube Outer Diameter (OD) | 19.05 mm to 50.8 mm (3/4 inch to 2 inches) | Custom diameters from 12 mm to 89 mm |
| Base Tube Wall Thickness | 1.5 mm to 3.5 mm | Optimized for specific design pressure ratings |
| Fin Height | 9.5 mm to 15.88 mm | Tailored to air-side pressure drop requirements |
| Fin Pitch / Density | 7 to 12 Fins Per Inch (FPI) / 2.1 mm to 3.6 mm pitch | Adjusted for fouling factor and cleaning method |
| Fin Thickness | 0.3 mm to 0.5 mm | Dependent on material alloy and rolling profile |
| Maximum Tube Length | Up to 12,000 mm | Exact cut-to-length tolerances within ±1.5 mm |
Materials & Surface Finish
Base Tube Materials:
ASTM A213 / A269 TP304/304L, TP316/316L, UNS S31803 / S32205 (Duplex 2205), and Nickel Alloys for severe chloride or acidic condensate resistance.
Fin Materials:
Commercially pure aluminum (Al 1060 / 1100) for maximized thermal transfer, or matching austenitic/ferritic stainless steel strips for uniform thermal expansion coefficients.
Surface Passivation:
Stainless steel components undergo acid pickling and passivation per ASTM A967 to restore chromium-rich protective oxide layers following mechanical handling.
Plain End Treatments:
Stripped fin ends with precision deburred square cuts, tailored for seamless tube-sheet expansion, hydraulic rolling, or automated orbital TIG welding.
Performance Features
Low Thermal Contact Resistance:
High-pressure mechanical rolling eliminates air gaps between fin and base tube interfaces, maintaining high heat transfer coefficients.
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Thermal Cycling Stability:
Permanent mechanical interlocking prevents fin loosening, detachment, or deformation under rapid temperature fluctuations and thermal shock.
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Corrosion Resistance:
Resistant to atmospheric scaling, sulfur compounds, and chemical washdowns, extending heat exchanger operational life in harsh outdoor installations.
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High Mechanical Strength:
Rigid fin profiles resist bending during routine high-pressure water jet cleaning or industrial maintenance procedures.
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Applications
Air-Cooled Heat Exchangers (ACHE):
Process cooling in oil refineries, petrochemical plants, and natural gas compression stations.
Waste Heat Recovery Units (WHRU):
Gas turbine exhaust boilers and industrial flue gas economizers.
Chemical Processing Condensers:
Acidic vapor condensers and closed-loop process fluid coolers.
HVAC/R Industrial Chillers:
Large-scale commercial and industrial air-source condenser coils.
Manufacturing & Quality Control
Cold-Rolling Fin Machines:
Multi-spindle precision rolling mills shape fins under controlled radial pressure, preventing over-thinning or tearing of the parent metal.
Eddy Current Testing (ECT):
100% non-destructive eddy current testing performed on base tubes prior to finning in accordance with ASTM E426 standards to detect internal or surface flaws.
Tension & Adhesion Testing:
Periodic destructive peel and pull-off tests verify that the mechanical bond strength between fins and base tubes meets engineering thresholds.
Dimensional & Visual Inspection:
Laser micrometer verification of fin pitch, outer fin diameter, and un-finned plain end lengths to ensure exact fit into header box hole patterns.
Custom Tube Manufacturing
Standard heat exchanger tube geometries often fail to fit replacement bundles or specialized thermal design envelopes. We fabricate rolled fin stainless steel tubes to precise engineering specifications, supporting custom fin heights, variable un-finned stripping lengths for multi-pass headers, specific bending radii (U-tube configurations), and specialized end coatings. Production is executed directly from client thermal data sheets and mechanical drawings.
Certifications
FAQ
As one of the most professional rolled fin stainless steel tube manufacturers and suppliers in China, we're featured by quality products and good service. Please rest assured to wholesale OEM rolled fin stainless steel tube from our factory. Also, custom service is available.
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