H Fin Tubes Manufacturer and Supplier
Amardeep Steel Centre LLP manufactures and supplies H fin tubes for boiler economizers, air preheaters and waste heat recovery systems. Our H fin tubes are built on carbon steel, alloy steel and stainless steel base tubes to ASTM and ASME standards, with the fin plates flash welded and pressure tested before dispatch. Send us your base tube grade, fin height and row arrangement and our technical team will confirm the right H fin tube specification within 24 hours.
What Are H Fin Tubes?
H fin tubes, also known as square fin tubes or H type fin tubes, are manufactured by symmetrically welding two steel curved plates together along a base tube, so the cross section shape of the fin is similar to the letter H. When there are two base tubes, sharing the common fin structure, they are known as HH type fin tubes, double H fin tubes and rectangular fin tubes.
The rectangular shape provides H fin tubes with a greater heat transfer surface area than a plain tube of the same length, and being a flat profile does not suffer from ash or dust accumulation and can be mechanically cleaned more easily than helical or spiral fin tubes. This means that H fin tubes are the preferred solution in the dirtiest, highest fouling locations of a boiler.
H Fin Tubes vs HH (Double H) Fin Tubes
| Feature | H Type (Single Tube) | HH Type (Double H / Rectangular) |
|---|---|---|
| Base tubes | One | Two, joined by a shared fin |
| Structural rigidity | Standard | Higher, suited to longer unsupported tube rows |
| Typical use | General economizer and APH banks | Waste incinerator economizers, longer flue gas passes |
| Fabrication | Flash welded fin plates on one base tube | Flash welded fin plates spanning two base tubes |
Applications of H Fin Tubes
- Boiler economizers in utility and industrial boilers
- Air preheaters (APH) at the tail end of the flue gas path
- Waste heat recovery from dust laden or ash laden flue gas
- Waste incinerator and municipal solid waste boiler economizers
- Marine boiler tail end heat recovery sections
H Fin Tubes Material and Specification
We manufacture H fin tubes on the same base tube grades used across our boiler tube range, so the fin tube and the plain tube sections of a project can be sourced from a single supplier.
| Parameter | Specification |
|---|---|
| Fin type | H type (single tube) or HH type (double tube) |
| Base tube standard | ASTM A179, A192, A210 (carbon steel), ASTM A213 T5/T11/T22 (alloy steel), ASTM A213 TP304/TP316 (stainless steel) |
| Fin material | Carbon steel or stainless steel plate, 3 to 5 mm thick |
| Base tube OD | 25 mm to 76 mm, other sizes on request |
| Joining method | Flash resistance welding of fin plate to base tube |
| Certification | EN 10204 3.1B mill test certificate, IBR Form III B on request |
How H Fin Tubes Are Manufactured
Each H fin tube starts as a certified base tube cut to the required length. Two fin plates are pre curved and positioned symmetrically along the tube, then joined to the base tube by flash resistance welding, a process that produces a high strength, fully fused weld with good thermal conductivity between fin and tube.
After welding, every H fin tube assembly is checked for weld continuity and subjected to a hydrostatic or pneumatic pressure test so any leak path is caught before the tube leaves the works.
Quality Testing for H Fin Tubes
- Hydrostatic or pneumatic pressure test on the finned assembly
- Weld tensile strength verification
- Dimensional check on fin height, pitch and base tube OD
- Visual inspection of weld continuity
- Mill test certificate per EN 10204 3.1B, IBR Form III B where applicable
Why Choose Amardeep Steel Centre for H Fin Tubes
- Base tubes sourced and tested to ASTM and ASME grades already used across our boiler tube range
- Single source for plain boiler tubes and finned tubes on the same project
- IBR capability for India registered boiler projects
- Full mill test certificates and third party inspection support (SGS, BV, Lloyd's, TUV)
- Export documentation and dispatch experience across 100+ countries
H Fin Tubes FAQs
Q. What is an H fin tube used for?
H fin tubes are used in the tail end heat recovery sections of boilers, mainly economizers and air preheaters, where the flue gas carries dust or ash. The rectangular H profile resists fouling better than a helical fin and is easier to clean.
Q. What is the difference between H type and HH type fin tubes?
H type fin tubes use one base tube with two welded fin plates forming an H shape. HH type, also called double H or rectangular fin tubes, uses two base tubes sharing one fin structure, which gives a more rigid assembly for longer tube rows.
Q. What base tube material is used for H fin tubes?
Carbon steel base tubes to ASTM A179, A192 or A210 are standard for economizer duty. Where flue gas temperature or corrosion is higher, we supply alloy steel (ASTM A213 T11, T22) or stainless steel base tubes.
Q. How are H fin tubes manufactured?
Two curved fin plates are flash welded symmetrically along the base tube. Every finished H fin tube is pressure tested to confirm the weld is sound before it is dispatched.
Q. Can H fin tubes be supplied with IBR certification?
Yes. We issue IBR Form III B alongside the standard EN 10204 3.1B mill test certificate for H fin tubes destined for India registered boiler projects.
Explore related pages: Boiler Tubes | Carbon Steel Finned Tubes | Alloy Steel Finned Tubes | Alloy Steel Products
Request a Quote for H Fin Tubes
Share the following and our technical team will respond within 24 hours:
- Grade or standard (H type or HH type, base tube grade)
- Base tube OD and fin height required
- Row arrangement and quantity
- Any IBR or third party inspection requirement
