Extruded Finned Tubes for Air-Cooler Condensers | EN 10217-7 1.4301

Our extruded finned tubes for air-cooler condensers are designed to improve heat-transfer efficiency in industrial cooling systems where reliable thermal performance, mechanical integrity, and corrosion resistance are essential. Manufactured using EN 10217-7 grade 1.4301 stainless-steel base tubes, these products are suitable for selected air-cooled heat exchangers, condenser assemblies, and industrial process-cooling applications.

The extruded-fin construction increases the effective external heat-transfer surface, helping equipment designers achieve the required cooling capacity within a compact footprint. Depending on the design, operating conditions, and fin material, these tubes can be specified for chemical processing, industrial refrigeration, HVAC equipment, and other air-cooled thermal systems.

Grade 1.4301, also known as X5CrNi18-10 or AISI 304, is an austenitic stainless steel containing chromium and nickel. It offers good general corrosion resistance, formability, weldability, and toughness. The final tube design should be selected according to the process medium, ambient conditions, operating temperature, pressure, and required service life.

Product highlights

• Stainless-steel base tube manufactured to EN 10217-7 grade 1.4301 requirements.

• Extruded-fin design for increased external heat-transfer area.

• Customizable tube diameter, wall thickness, fin height, fin pitch, and tube length.

• Options for different fin materials and tube-to-fin configurations, subject to engineering review.

• Suitable for engineered air-cooler condensers and other heat-transfer equipment.

• Inspection and documentation available according to the agreed purchase specification.

Used in selected condenser systems to reject heat from process fluids or refrigerants to ambient air. The increased external surface area supports compact heat-exchanger designs.

Suitable for process cooling in chemical, petrochemical, and general industrial facilities where stainless-steel tubing is compatible with the operating environment.

Can be considered for condenser and cooling-coil assemblies where the selected tube and fin materials meet refrigerant, pressure, temperature, and corrosion requirements.

Applicable to selected gas coolers, process-fluid coolers, and thermal equipment requiring corrosion-resistant tubing. Material compatibility must be verified for each process medium.

May be used in suitable low- or moderate-temperature heat-recovery systems when the mechanical design, temperature limits, and fin material are appropriate.

Note: The dimensional ranges above are indicative manufacturing ranges, not dimensional limits prescribed by EN 10217-7. Actual availability depends on the fin-extrusion process, tube geometry, fin material, design requirements, and manufacturer capability. Confirm dimensions and tolerances before ordering.

The following values are the typical specified limits for grade 1.4301 under EN 10217-7:2021. Final acceptance shall be based on the applicable standard edition and the material certificate.

These limits apply to the stainless-steel base tube, not automatically to the fin material. Chemical analysis of the fin alloy should be assessed separately when specified.

For EN 10217-7 grade 1.4301 (X5CrNi18-10), the typical specified ambient-temperature mechanical properties are:

These values apply to the base tube in the specified delivery condition. Actual acceptance depends on the applicable standard, product form, dimensions, orientation, and delivery condition. The finned assembly may exhibit different mechanical behavior after fin forming and should be evaluated as a complete component where required.

Select welded stainless-steel tubes meeting the required EN 10217-7 grade, dimensions, delivery condition, and traceability requirements.

Verify tube dimensions, surface condition, material identification, weld quality, and required mechanical or nondestructive test records.

Clean and prepare the base tube according to the requirements of the selected finning process and fin material.

Form the specified external fins using the approved extrusion method and compatible materials. The exact construction depends on the design, including whether the fins are formed from a sleeve or another engineered configuration.

Check fin height, fin pitch, outside diameter over fins, fin continuity, tube length, and other specified dimensions.

Perform the agreed final checks, confirm traceability, protect the tube ends and fin surfaces, and package the products for transport.

Quality assurance should be defined for both the base tube and the completed finned assembly.

1. Visual inspection: Check for surface defects, cracks, dents, fin damage, contamination, and unacceptable weld irregularities.

2. Dimensional inspection: Measure base-tube diameter and wall thickness, tube length, fin height, fin pitch, overall finned diameter, and straightness against the approved drawing.

3. Chemical composition analysis: Verify the base-tube grade through mill test certificates and, when required, positive material identification (PMI) or laboratory analysis.

4. Tensile testing: Verify proof strength, tensile strength, and elongation according to the applicable tube standard and test requirements.

5. Weld inspection: Inspect the longitudinal weld and review the specified weld-quality or nondestructive examination records.

6. Leak-tightness testing: Conduct the required hydrostatic or suitable nondestructive leak test on the base tube, as specified by the applicable standard and purchase order.

7. Additional mechanical tests: Flattening, drift-expanding, ring-expanding, bend, or other tests may be required according to the selected standard options and product dimensions.

8. Nondestructive testing: Eddy-current, ultrasonic, or other approved methods may be applied where required by the standard, customer specification, or risk assessment.

9. Fin integrity inspection: Verify fin uniformity, continuity, surface condition, dimensional consistency, and the specified integrity of the tube-fin interface.

10. Final documentation review: Confirm material certificates, heat or batch identification, inspection records, dimensional reports, and packing lists.

Not every test is mandatory for every order. The inspection and test plan should identify the applicable standard requirements, supplementary tests, acceptance criteria, and inspection stage.

• Improved heat-transfer area: External fins increase the surface available for heat exchange with air.

• Compact equipment design: Higher effective surface area can help reduce the required heat-exchanger footprint, subject to thermal design.

• Corrosion-resistant base material: Grade 1.4301 offers good general resistance in many atmospheric and industrial environments.

• Flexible configuration: Fin dimensions and tube geometry can be adapted to meet the specified thermal duty and installation constraints.

• Potentially reduced maintenance: Correct material selection and appropriate operating conditions can help extend service life.

• Project-specific manufacture: Tube dimensions, lengths, materials, and inspection requirements can be agreed to suit the application.

Although grade 1.4301 is widely used for general stainless-steel applications, it is not universally suitable for all condenser services. Chloride-rich water, marine environments, aggressive chemicals, and certain elevated-temperature conditions may require a more corrosion-resistant alloy.

Where aluminum fins are used, the designer should evaluate galvanic corrosion, moisture exposure, operating temperature, differential thermal expansion, and compatibility between the fin and tube materials. The selected extrusion configuration must provide the required thermal contact and mechanical integrity throughout the intended operating range.

The finished product should be qualified against the applicable pressure-design code, heat-exchanger design requirements, and project-specific inspection plan. EN 10217-7 compliance of the base tube alone does not certify the complete finned assembly for a particular pressure or temperature rating.

Finned tubes are packaged to minimize bending, abrasion, contamination, and fin deformation during handling and transport. Tube ends can be protected as specified, and bundles can be labeled with product dimensions, material grade, heat or batch identification, and order details.

Delivery length, bundle configuration, protective packaging, marking, documentation, and export requirements can be agreed during order confirmation.

To obtain a quotation, please provide:

• Base-tube outside diameter and wall thickness.

• Base-tube material and applicable standard edition.

• Fin material, height, pitch, thickness, and construction.

• Overall finned diameter and tube length.

• Required quantity and delivery schedule.

• Operating pressure, temperature, process medium, and ambient conditions.

• Applicable design code, inspection requirements, and material certification.

• Approved drawings or project-specific technical specifications.

Our engineering and sales team can review these details to determine the suitable tube-fin configuration for the intended air-cooler condenser application.

Q1: What is EN 10217-7 grade 1.4301?

It is a welded stainless-steel tube specification for pressure purposes using grade 1.4301, also known as X5CrNi18-10 or AISI 304.

Q2: Are extruded finned tubes suitable for air-cooler condensers?

Yes, when the tube and fin materials, fin geometry, thermal duty, and mechanical design are suitable for the operating conditions.

Q3: Does EN 10217-7 specify the fin dimensions?

No. The standard covers the welded stainless-steel base tube. Fin dimensions and manufacturing tolerances must be defined separately.

Q4: Can aluminum fins be used with a 1.4301 stainless-steel base tube?

They may be suitable in properly engineered designs. Compatibility, corrosion risk, operating temperature, and fin-to-tube contact must be evaluated.

Q5: What inspection documents can be supplied?

Depending on the purchase specification, documentation can include material certificates, dimensional inspection reports, mechanical-test results, weld inspection records, leak-test records, and final inspection documentation.

Extruded finned tubes with EN 10217-7 grade 1.4301 stainless-steel base tubes offer a configurable solution for air-cooler condensers and industrial heat exchangers that require increased external heat-transfer area and good general corrosion resistance. Correct specification of the base tube, fin material, fin geometry, inspection plan, and operating conditions is essential to achieving reliable performance and a long service life.