UNS C44300 Admiralty Brass Tube PDF
What's Admiralty Brass?
The legacy of Admiralty Brass UNS C44300 is rooted in solving a critical engineering challenge. Early brass condenser tubes failed from dezincification a process where zinc leached from the alloy in seawater leaving behind a weak porous copper structure. The innovation was adding approximately 1% tin to the copper-zinc formula. This modification essentially improved performance by creating a stable protective surface film to inhibit dezincification. The result is an alloy with an optimal balance of thermal conductivity mechanical strength and corrosion resistance.
In the field of marine engineering, C44300 is recognized as a benchmark Admiralty brass grade. The key lies in the deliberately added tin element, which gives this copper-zinc alloy exceptional resistance to seawater corrosion and dezincification. Therefore, it is widely used in the manufacture of core equipment such as condenser tubes and heat exchangers for ships, making it a classic material that withstands the harsh marine environment.
C44300 Admiralty Brass
Admiralty Brass is most effective in tube form. Admiralty Brass Tubes are manufactured through a seamless process from a solid billet. This seamless construction eliminates welds or seams that often serve as initiation sites for corrosion and mechanical failure.
The structural integrity of seamless tubes is essential for high-pressure applications including:
Heat exchangers and condensers
Desalination facilities
Power plant cooling circuits
Refrigeration and air-conditioning systems
Admiralty Brass is also non-magnetic exhibits excellent cold workability and is readily joined by brazing or soldering for versatile fabrication.
The standard chemical composition for Admiralty Brass C44300 per ASTM B111:
| Element | Composition (%) | Role in the Alloy |
| Copper (Cu) | 70.0 – 73.0 | The alloy's foundation providing excellent thermal conductivity. |
| Tin (Sn) | 0.9 – 1.2 | The primary inhibitor preventing dezincification. |
| Arsenic (As) | 0.02 – 0.06 | A secondary inhibitor for added stability. |
| Lead (Pb) | Max 0.07 | An impurity limited to ensure material integrity. |
| Iron (Fe) | Max 0.06 | An impurity controlled for high corrosion resistance. |
| Zinc (Zn) | Balance | Provides mechanical strength and hardness. |
C44300 Mechanical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 331-379 MPa | 48000-55000 psi |
| Yield strength (depending on temper) | 124-152 MPa | 18000-22000 psi |
| Elongation at break (in 0 mm) | 65% | 65% |
| Creep strength | 0.370 MPa | 53.7 psi |
| Charpy impact | 82.4 J | 60.8 ft-lb |
| Fatigue strength | 115-125 MPa | 16700-18100 psi |
| Elastic modulus | 117 GPa | 17000 ksi |
| Poisson's ratio | 0.34 | 0.34 |
| Machinability | 30 | 30 |
| Shear modulus | 40.0 GPa | 5800 ksi |
C44300 Thermal Properties
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient (@20-300°C/68-572°F) | 20.2 µm/m°C | 11.2 µin/in°F |
| Thermal conductivity (@20°C/ 68°F) | 110 W/mK | 763 BTU in/hr.ft².°F |
Admiralty Brass Vs Naval Brass
| Properties | Admiralty Brass Tube | Naval Brass Tube |
|---|---|---|
| Composition | 29% zinc, 70% copper, and 1% tin | 39-41% zinc, 60-63% copper, and 0.75-1.25% tin. |
| Application | use for for heat exchangers and condensers tubing | use for valves, propeller shafts and fittings |
| Corrosion Resistance | excellent corrosion resistance | less corrosion resistance |
| Strength | lower strength due to its lower zinc | higher strength |
| Machinability | good machinability | less machinability |
ASTM B111 C44300 Brass Tube Packaging and Testing
Our spot inventory
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C44300 copper tube |
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C44300 tube for seawater |
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C44300 brass tube |
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ASTM B111 C44300 tube |
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C44300 condenser tube |
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C44300 copper pipe |
Founded in 2008, we are a leading professional exporter specializing in a comprehensive range of high-quality copper products for global markets. Our core product portfolio encompasses various forms and specifications to meet diverse industrial needs.
Copper Tubes & Pipes:
We supply both Copper Seamless Tubes (ASTM B68, B75) and Copper Welded Tubes, including Pure Copper Tubes (C11000, C12200), Brass Tubes (C23000, C26000, C28000), and specialized Admiralty Brass Tubes (C44300) for superior corrosion resistance in heat exchanger applications. Our offerings comply with key ASTM standards such as ASTM B88 for seamless water tube and ASTM B111 for condenser tubes.
Copper Sheets & Plates:
Our range covers from thin-gauge Thin Copper Sheet (ASTM B152) to heavy-duty Thick Copper Plate, available in alloys like Pure Copper (C11000), Brass Sheet (C26000), Phosphor Bronze Sheet (C51000, C52100), and corrosion-resistant Admiralty Brass Sheet/Plate (C44300).
Copper Rods & Bars:
We provide Copper Round Rod, Copper Square Bar, Copper Hexagon Bar, and Copper Flat Bar in various tempers. Products include Free-Cutting Brass Rod (C36000 per ASTM B16), Oxygen-Free Copper Rod (C10100/C10200, ASTM B187), Beryllium Copper Bar (C17200, ASTM B196), and Admiralty Brass Rod (C44300).
Copper Wires & Strips:
Our Copper Wire products include Bare Copper Wire (ASTM B1/B2/B3), Enamelled Copper Wire, and Brass Wire. We also supply precision Copper Strip (C11000, C26800), Brass Strip, and Admiralty Brass Strip (C44300) for electrical, marine, and fabrication applications.
