ASME SA213 T12 SMLS Base Tube Carbon Steel Fins HFW Finned Tube For Air cooler
HFW Solid Finned Tubes is an acronym for High Frequency Welded Spiral Solid Finned Tubes. Spiral finned tubes provide designers with high thermal efficiency and compact design solutions for a variety of heat exchangers using clean flue gases. There are two types of spiral finned tubes: solid and serrated.
Spiral solid finned tubes are manufactured by spirally wrapping a continuous strip of fins around the tube. High-frequency resistance welding typically uses a frequency of 400 kHz. The fins are wound around the tube and continuously welded. The fin strip is spirally wound around the tube and continuously welded to the base tube along the root of the spiral by a high-frequency electrical process. The fin tape is tensioned and laterally restrained as it forms around the tube, ensuring that the fin tape is in firm contact with the surface of the base tube. A gas metal arc welding process is utilized to continuously weld the fin strip at the point where it begins to bend around the diameter of the pipe.
Chemical Composition of ASTM A213 T12 Seamless Boiler Tubes
| Grade | Chemical Composition(%) |
| C | Mn | P | S | Si | Cr | Mo |
| A213 T12 | 0.05-0.15 | 0.30-0.60 | ≤0.025 | ≤0.025 | ≤0.50 | 0.80-1.25 | 0.45-0.65 |
Mechanical Properties of ASTM A213 T12 Seamless Boiler Tubes
| Low Alloy Steels |
| Grade | UNS
Designation | Tensile
Strength,
min, ksi
[MPa] | Yield
Strength,
min, ksi
[MPa] | Elongation
in 2 in. or
50 mm,
min, % | Hardness |
| Brinell/Vickers | Rockwell |
| T12 | K11562 | 60 [415] | 32 [220] | 30 | 163 HBW/
170 HV | 85 HRB |
Heat Treatment of ASTM A213 T12
| Grade | UNS
Number | Heat Treat Type | Austenitizing/ Solutioning Temperature,
min or range ºF [ºC] | Cooling Media | Subcritical Annealing or Tempering Temperature,
min or range ºF [ºC] | |
ASTM
Grain S |
| Ferritic Alloy Steels |
| T12 | K11562 | full or isothermal anneal | … | … | … | … |
| normalize and temper | … | … | … | … |
| subcritical anneal | … | … | 1200 to 1350[650 to 730] | … |
Technical Details/Base Tube Details
Tube Diameter : 20 mm OD Min to 219 mm OD Max.
Tube Thickness : Minimum 2 mm up to 16mm
Tube Material : Carbon Steel, Stainless Steel, Alloy Steel, Corten steel, duplex Steel, Super Duplex Steel, Inconel, High Chrome High Nickle & Incolloy, CK 20 material and some other material.
Fin Details
Fins Thickness : Min. 0.8 mm to Max. 4 mm
Fins Height : Min 0.25” (6.35 mm) To Max.1.5” (38 mm)
Fin Density : Min 43 Fins Per Meter To Max. 287 Fins Per Meter
Material : Carbon Steel, Stainless Steel, Alloy Steel, Corten steel, Duplex Steel and Incolloy.
For a rapid quotation, plz send with following requirement:
Number of pieces,
base tube: Diameter, thickness, length and material specification.
Fins: material specification, type (solid or serrated), height, thickness, spacing, finned length and unfinned sections. Weld prep details if required.
Delivery period required.
Keywords: Fin tubes, Finned tube, Finned Pipe Helical Finned Tubes, Solid fin tubes, Serrated finned tube, Helical Serrated Finned Tubes, Tubos Aletados
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ASME SA213 T12 SMLS Base Tube Carbon Steel Fins HFW Finned Tube For Air cooler Images
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