Admiralty Brass Fin Tube Manufacturer and Supplier in India
An Admiralty brass fin tube starts life as a plain Admiralty brass tube to ASTM B111, grade C44300, and is then finished with fins to increase its surface area for heat exchanger duty. The plain tube itself is what gives the finished fin tube its real value; Admiralty brass has been the standard material for marine and refinery heat exchanger tube for the better part of a century because it resists the exact conditions that destroy ordinary brass: seawater, brackish water, and the sulphur compounds that show up in refinery process streams. Amardeep Steel Centre manufactures Admiralty brass fin tube to this grade and standard, finished and hydro-tested for oil refinery, feedwater heater, and surface condenser duty.
What Is Admiralty Brass Finned Tubes?
Admiralty brass fin tube is made by taking a plain admiralty brass tube, procured and tested to ASTM B111 in grade C44300, and finishing it with external fins to increase the surface area available for heat transfer. If your application requires plain tubing rather than a finned product, see our Admiralty Brass Seamless Tube and C44300 Admiralty Brass Tubes pages for the relevant specifications. This page covers what changes once that same tube is turned into a finned product.
The finning process itself does not change the base tube's corrosion resistance, the same C44300 alloy that resists seawater and sulphur compound attack in plain tube form does exactly the same job once it has fins on it. What finning adds is surface area, which is why admiralty brass fin tube shows up so often in heat exchanger duty where the tube count and the physical size of the exchanger both matter as much as corrosion resistance.
Technical Data
Admiralty Brass Low Fin Tubes Specification
| Specification | Detail |
|---|---|
Base tube standard | ASTM B111 / B359 |
Grade | C44300 (Admiralty Brass), C27200 and C68700 available as related options |
Temper | Annealed (O61) for finning, as finned condition standard |
Base tube outer diameter | 15.88 mm to 25.40 mm |
Wall thickness | 0.71 mm to 1.65 mm |
Fin material | Admiralty brass or aluminium, matched to the base tube on request |
Standard length | Up to 10 metres, intermediate landings available on request |
End finish | Deburred, smooth plain ends |
Chemical Composition of Admiralty Brass Finned Tubes
| Element | Copper (Cu) | Zinc (Zn) | Tin (Sn) | Iron (Fe) maximum | Lead (Pb) maximum | Arsenic (As) |
|---|---|---|---|---|---|---|
Admiralty Brass C44300 | 70.0 to 73.0 | Balance | 0.9 to 1.2 | 0.06 | 0.07 | 0.02 to 0.06% |
Mechanical Properties of Admiralty Brass Fin Tube
| Property | Annealed Condition (O61) |
|---|---|
Tensile strength, minimum | 315 MPa (45700 psi) |
Yield strength, minimum | 125 MPa (18100 psi) |
Elongation in 50 mm, minimum | 65 percent |
Hardness, typical | 55 to 75 HRF |
Admiralty Metal Finned Tubes Dimension Chart
| Base Tube OD (mm) | Wall Thickness (mm) | Fin Density (fins per inch) | Fin Height (mm) |
|---|---|---|---|
15.88 | 0.71 | 11 | 1.30 |
19.05 | 0.89 | 16 | 1.60 |
19.05 | 1.05 | 19 | 2.00 |
22.22 | 1.24 | 24 | 2.50 |
25.40 | 1.65 | 26 | 3.00 |
Admiralty Brass Finned Tubes and Pipe Product Ranges
Applications and Industries: Admiralty Brass Low-Finned Tubes
- Oil refinery heat exchangers
- Feedwater heaters
- Surface condensers
- Marine and desalination plant
- General industrial heat exchangers
Frequently Asked Questions about Admiralty Brass Finned Tubes
What is admiralty brass fin tube?
It is a plain admiralty brass tube, made to ASTM B111 in grade C44300, finished with external fins to increase the surface area available for heat transfer. The finning does not change the underlying corrosion resistance of the alloy, it simply adds surface area for heat exchanger duty.
Why is admiralty brass used for fin tube construction?
Admiralty brass contains a small addition of tin alongside copper and zinc, and that tin addition slows down dezincification, the corrosion process that destroys ordinary brass in seawater and brackish water. Combined with good thermal conductivity, that is why admiralty brass has remained the standard choice for marine and refinery heat exchanger tube for decades.
What is the difference between admiralty brass fin tube and plain admiralty brass tube?
Plain admiralty brass tube is a smooth bore tube with no external surface enhancement. Admiralty brass fin tube starts as that same plain tube and is finished with fins to increase the outside surface area, which lets the finished heat exchanger use fewer tubes for the same heat transfer duty. See our admiralty brass seamless tube page for the plain tube specification.
What standards govern admiralty brass fin tube manufacturing?
ASTM B111 and ASTM B359 are the standards most commonly specified for admiralty brass tube intended for heat exchanger and condenser duty, covering the plain tube before finning and the finished tube after.
What testing is carried out on admiralty brass fin tubes?
The plain tube is eddy current tested before finning to check for surface and subsurface defects. After finning, the tube is hydro tested to confirm it holds pressure without leaking, and dimensional inspection confirms the finished fin geometry matches the agreed specification.
Which industries use admiralty brass fin tubes?
Oil refinery heat exchangers, feedwater heaters, surface condensers, marine and desalination plant, and general industrial heat exchangers all commonly use admiralty brass fin tube wherever seawater, brackish water or sulphur bearing process streams are involved.
Can admiralty brass fin tube be supplied with intermediate landings?
Yes. Intermediate landings, meaning short plain sections left unfinned along the length of the tube, can be supplied on request to support baffle sheets inside a heat exchanger. Tell us the landing positions your design needs and we will confirm this before manufacture.
Get a Quote for Admiralty Brass Fin Tubes
Request a quote with your base tube dimensions, fin density and quantity, and our team will confirm price and availability the same working day.
Related Products
Admiralty Brass Seamless Tube, C44300 Admiralty Brass Tubes, Admiralty Brass Tapered Tube PlugsBrass Finned Tubes, Aluminium Brass Seamless Tubes, Condenser Tubes
