ASME SA210 Gr. C KL Finned Tube with Al1060 Fins For Boiler Economizer Bundles

ASME SA210 Gr. C KL Finned Tube with Al1060 Fins For Boiler Economizer Bundles

Overview

ASME SA210 GR.C KL type finned tube fitted with Al1060 fins is a robust mechanically tension-wound heat transfer component, widely deployed in boiler heat surfaces, high-pressure waste heat recovery units, process air coolers and high-temperature industrial heat exchangers. Unlike conventional L-type wound fin tubes, this KL variant adopts tube knurling paired with L-foot tension wrapping technology, which effectively addresses recurring pain points including fin detachment, elevated contact thermal resistance and gradual heat transfer decay seen in standard wound fin tubes operating under sustained high-temperature loads and fluctuating vibration conditions.

This finned tube utilizes ASME SA210 Grade C seamless medium-carbon boiler tube as the base pipe, matched with high-purity Al1060 aluminum strip for external fins. The combination of pressure-resistant boiler-grade steel substrate and high-conductivity aluminum fins delivers a sturdy, thermally efficient and cost-effective heat transfer solution for elevated-temperature, pressurized heat exchange workflows.

Base Tube Material: ASME SA210 GR.C

ASME SA210 Grade C is a seamless medium-carbon manganese boiler and superheater tube defined by ASME boiler and pressure vessel codes. It boasts consistent wall thickness, superior tensile strength, dependable pressure-bearing capacity and stable thermal performance under continuous high-temperature service.

Compared with low-carbon seamless grades such as SA179, SA210 GR.C features higher strength and temperature tolerance, making it suitable for systems with higher internal fluid pressure and elevated operating temperature. Free from weld seam defects, this seamless base tube eliminates leakage risks, adapting to long-duration boiler service, frequent thermal cycling and demanding pressurized working environments. It is a preferred base material for economizers, HRSG bundles and high-duty finned heat exchange assemblies.

ASME SA210 GR.C (Seamless Medium-Carbon Steel Boiler Tube)

(1) Chemical Composition (wt %, per ASME SA-210)

Note: No intentional addition of extra alloying elements for standard SA210 GR.C base material.

(2) Mechanical Properties (Room Temperature)

Fin Material: Al1060 Pure Aluminum

This KL finned tube is equipped with Al1060 industrial pure aluminum fins with purity above 99.6%. This material delivers outstanding thermal conductivity, low mass density and excellent ductility, allowing tight helical winding without cracking or permanent distortion. The extended aluminum fin surface greatly enlarges the air-side heat exchange area, cuts down air-side thermal resistance and substantially lifts the overall heat dissipation capability of the heat exchanger bundle. Additionally, Al1060 aluminum fins offer reliable oxidation resistance under normal atmospheric conditions, offering passive protection to the underlying steel base tube against mild corrosive agents and extending the service lifespan of the finned assembly.

Unique KL Type Fin Structure Advantage

The core merit of SA210 GR.C KL finned tube lies in its dedicated KL (Knurled + L-foot) manufacturing workflow. Prior to aluminum fin winding, the outer circumference of the SA210 GR.C base tube is precision knurled to form uniform micro-grooved texture. The Al1060 aluminum strip is then spirally wrapped onto the textured tube surface under constant tension via an L-foot interlocking profile.

This mechanical interference fit creates firm, locked contact between fins and base tube, substantially lowering contact thermal resistance. It guards against fin loosening, peeling and heat performance degradation triggered by thermal expansion and contraction, flue gas impingement and equipment vibration, an advantage that plain tension-wound fin tubes cannot match. The securely anchored fin structure preserves steady, predictable heat transfer output throughout extended operating cycles.

Main Applications of ASME SA210 GR.C KL Type Finned Tube with Al1060 Aluminum Fins

ASME SA210 GR.C KL finned tubes with Al1060 aluminum fins function as core heat exchange elements for high-pressure, medium-to-high temperature air-side heat transfer systems. Thanks to the knurled L-foot mechanical locking design, aluminum fins remain securely bonded to the SA210 seamless base tube even under persistent airflow vibration and repeated temperature swings. This reliability makes them a top selection for boiler auxiliary circuits and high-pressure waste heat recovery projects.

Common application scenarios include:

Boiler Economizer Bundles – Primary application. These finned tubes form heat transfer bundles for boiler economizers, recovering residual heat from flue gas to preheat feedwater.

Heat Recovery Steam Generators (HRSG) – Integrated into waste heat recovery units for gas turbine and thermal power plants to boost overall energy efficiency.

High-pressure Air Coolers – Process cooling bundles for power, chemical and oil & gas facilities where internal fluid pressure exceeds the range of SA179 fin tubes.

Superheater Auxiliary Heat Surfaces – Auxiliary cooling and heat recovery circuits for boiler superheater and flue gas treatment systems.

Petrochemical & Refinery Heat Exchangers – Cooling bundles for high-pressure process fluids, medium-temperature gas cooling and condensation services.

Industrial Flue Gas Heat Recovery – Capture waste heat from industrial furnace exhaust for preheating combustion air or process water.

Key Features

✅ Standard ASME SA210 GR.C seamless boiler-grade base tube, high pressure resistance and high-temperature stability

✅ High-purity Al1060 aluminum fins, superior thermal conductivity and efficient heat dissipation

✅ Precision KL knurled L-foot tension winding process, mechanically locked fins, resistant to peeling

✅ Low contact thermal resistance, consistent heat transfer performance over long service cycles ✅ Fully customizable dimensions, supporting tailored fin height, fin pitch, tube OD, wall thickness and cutting length

✅ Full dimensional inspection and material test certification available, compliant with international boiler and heat exchanger standards