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Admiralty Brass (C44300) vs. Naval Brass (C46400)
Naval Brass is stronger and harder due to higher zinc content.
Admiralty Brass offers superior resistance to dezincification.
Decision: Specify Admiralty Brass for heat exchanger tubing. Use Naval Brass for structural components like tube plates and fasteners where strength is the primary need.
Admiralty Brass (C44300) vs. Copper-Nickel (Cu-Ni)
Copper-Nickel alloys offer superior resistance to high-velocity seawater and erosion.
Admiralty Brass is a highly effective and more economical solution for moderate water velocities.
Decision: Admiralty Brass is the standard for most condensers. Upgrade to Copper-Nickel for aggressive environments like offshore platform piping or systems with high turbulence.
Governing Manufacturing Standards
ASTM B111 / B111M: The predominant standard for seamless condenser tubes.
ASME SB-111: The boiler and pressure vessel code equivalent.
BS 2871 Part 3 CZ111: British standard for heat exchanger tubes.
EN 12451: European standard for seamless copper alloy tubes.
FAQs About Admiralty Brass
What is Admiralty Brass primarily used for?
Steam condensers, oil coolers, evaporators, shell-and- tube heat exchangers all specify Admiralty Brass for tubes. Its value comes from combining great corrosion resistance with great thermal conductivity.
How is Admiralty Brass composed generally?
UNS C44300's normal composition is around 71% copper 28% zinc and 1% tin with a trace of arsenic acting as a further corrosion inhibitor.
Compared to Naval Brass, how is Admiralty Brass unique?
Admiralty Brass is formulated for superior corrosion resistance in tubing. Naval Brass is a stronger harder alloy better suited for mechanical and structural components like plates where strength is the priority.
Can Admiralty Brass Tubes be used in chemical industries?
Yes they are widely used in chemical processing for heat exchangers handling process water steam hydrocarbons and other non-oxidizing solutions. They are not recommended for service with strong oxidizing acids or ammonia.
Why is tin a critical addition to Admiralty Brass?
The 1% tin content is the key inhibitor against dezincification. It forms a stable protective oxide film on the tube surface preserving the alloy's structural integrity and ensuring a long reliable service life.
Products provided by GNEE
| Product Category | UNS Numbers | Typical Sizes | Thickness/Diameter | Available Forms | Surface Treatment |
|---|---|---|---|---|---|
| Pure Copper | C10100, C10200, C10300, C10400, C10500, C10700, C10800, C10900, C11000, C11100, C11300, C11400, C11500, C11600, C12000, C12200 | 1000-6000mm (length) | 0.1-200mm | Sheet, Plate, Strip, Foil | Mill finish, Polished, Bright annealed, Oiled, Brush finished |
| Brass Alloys | C21000, C22000, C23000, C24000, C26000, C26800, C27000, C27200, C28000, C33000, C33200, C33500, C34000, C34500, C35000, C35300, C35600, C36000, C36500, C37000, C37700, C38500 | 500-4000mm (length) | 0.05-150mm | Rod, Bar, Wire, Tube | Polished, Chrome plated, Lacquered, Satin finish |
| Bronze Alloys | C51000, C52100, C52400, C53400, C54400, C63000, C63200, C64200, C65100, C65500, C65700, C67300 | 1000-3000mm (length) | 0.2-100mm | Bar, Rod, Plate, Strip | Polished, Oxidized, Oiled, Ground |
| Copper-Nickel | C70400, C70600, C71000, C71500, C72200 | 2000-6000mm (length) | 0.5-250mm | Tube, Plate, Sheet | Pickled, Passivated, Polished |
| Phosphor Bronze | C50100, C50500, C50700, C51000, C51100, C51900, C52100, C52400 | 500-2000mm (length) | 0.05-50mm | Strip, Wire, Sheet | Polished, Tin plated, Natural |
