Serrated Finned Tubes for Heat Recovery Steam Generators (ASME SA213 T12)

High-Frequency Welded (HFW) Finned Tubes manufactured from ASME SA213 T12 (1Cr–0.5Mo alloy steel) are widely used in medium-to-high temperature heat transfer systems. This material grade offers an excellent balance of thermal conductivity, mechanical strength, and oxidation resistance, making it suitable for boilers, economizers, and industrial heat recovery equipment.

The high-frequency resistance welding process ensures a continuous metallurgical bond between fin and base tube, delivering superior heat transfer efficiency and long-term operational reliability even under cyclic thermal loads.

• Product Type: High-Frequency Welded Finned Tube
• Base Material: ASME SA213 T12 (Cr-Mo alloy steel)
• Fin Material: Carbon steel / alloy steel (application matched)
• Fin Type: Continuous helical strip fin
• Manufacturing Method: High-frequency resistance welding (HFW)

Designed to meet diverse engineering and thermal design requirements, our finned tubes are available in a wide range of specifications:

• Outer Diameter (OD): 19.05 mm – 76.2 mm (3/4" – 3")
• Wall Thickness: 2.0 mm – 8.0 mm
• Length: Up to 12,000 mm or customized lengths available

• Fin Height: 8 mm – 25 mm
• Fin Thickness: 0.8 mm – 2.5 mm
• Fin Pitch: 2 mm – 5 mm adjustable
• Fin Density: Customized based on thermal duty and pressure drop requirements

Key Metallurgical Features:

• Balanced Cr-Mo composition for moderate high-temperature strength
• Good resistance to oxidation and scaling
• Stable microstructure after heat treatment

Material is typically supplied in normalized and tempered condition to ensure uniform mechanical performance and improved creep resistance.

To ensure consistent quality and compliance with ASME standards, each finned tube undergoes rigorous inspection:

• Outer diameter, wall thickness, and straightness control
• Fin height, pitch, and alignment verification

• Eddy Current Testing (ECT) for base tube integrity
• Ultrasonic Testing (UT) for weld quality assurance
• Visual inspection of fin weld continuity

• 100% hydrostatic testing for leak integrity
• Optional pneumatic testing for specific applications

• PMI (Positive Material Identification)
• Spectrochemical analysis for heat traceability
• Certification in accordance with ASME SA213 requirements

SA213 T12 High-Frequency Welded Finned Tubes are commonly used in:

• Boiler economizers
• Industrial heat recovery systems
• Power generation plants
• Refinery heaters and exchangers
• Waste heat recovery units (WHRU)
• Process heating systems in petrochemical plants

• Excellent heat transfer efficiency due to strong fin bonding
• Cost-effective solution for medium-temperature applications
• High structural stability under thermal cycling
• Extended service life with minimal maintenance requirements
• Flexible customization for thermal and mechanical design optimization