UNS C44300 Admiralty Brass Tube PDF
What is ASTM B111 C44300 copper tubing?
UNS C44300 Admiralty Brass, also sometimes referred to as Arsenical Brass, is copper that is alloyed with tin and zinc. Brass 443 tubes have long been used in heat exchangers and condensers because of the good corrosion resistance and excellent heat transfer characteristics of C44300.
Admiralty brass, also known as ASTM B111 UNS C44300, is a copper-zinc alloy with small amounts of tin and trace amounts of other elements. It is commonly used in marine applications due to its high corrosion resistance and excellent thermal conductivity. The seamless tube made from Admiralty brass is manufactured according to ASTM B111 standards, which specify the requirements for seamless copper and copper-alloy tubes for heat exchangers and condensers. These tubes are typically used in a variety of applications, including desalination plants, power plants, and shipbuilding. Admiralty brass seamless tubes are known for their high strength, durability, and resistance to stress corrosion cracking. They are also easy to form and weld, making them a popular choice for various industrial applications. Admiralty brass seamless tubes are a reliable and cost-effective solution for demanding marine and industrial applications that require superior corrosion resistance and thermal conductivity.
Properties of C44300 Admiralty Brass Tubes
Chemical Composition
| Element | Content (%) | Purpose |
|---|---|---|
| Copper (Cu) | 70.0 - 73.0 | Base metal, provides corrosion resistance & ductility |
| Zinc (Zn) | 26.0 - 29.5 | Strengthens alloy, lowers cost |
| Tin (Sn) | 0.9 - 1.2 | Improves corrosion & erosion resistance |
| Arsenic (As) | 0.02 - 0.10 | Critical: Inhibits dezincification |
| Lead (Pb) | ≤ 0.07 | Trace impurity |
| Iron (Fe) | ≤ 0.06 | Trace impurity |
Mechanical Properties (Typical for Tubes)
| Property | Annealed Condition | Hard-Drawn Condition |
|---|---|---|
| Tensile Strength | 325 - 380 MPa | 380 - 450 MPa |
| Yield Strength (0.2% offset) | 125 MPa | 310 MPa |
| Elongation (in 50 mm) | 55% | 15% |
| Hardness (Brinell) | 80 HB | 155 HB |
| Modulus of Elasticity | 110 GPa | 110 GPa |
| Fatigue Strength | ~130 MPa | ~170 MPa |
Physical Properties
| Property | Value | Notes |
|---|---|---|
| Density | 8.53 g/cm³ | - |
| Melting Range | 900 - 940 °C | - |
| Thermal Conductivity | 111 W/m·K at 20°C | Excellent for heat transfer |
| Electrical Conductivity | 26% IACS | - |
| Coefficient of Thermal Expansion | 20.2 ×10⁻⁶/K (20-300°C) | - |
| Specific Heat Capacity | 380 J/kg·K | - |
Corrosion Resistance Properties (Key for Tube Applications)
| Corrosion Type | Resistance Level | Notes |
|---|---|---|
| Dezincification | Excellent | Arsenic inhibits selective leaching of zinc |
| Impingement Attack | Very Good | Up to ~2.5 m/s water velocity |
| Stress Corrosion Cracking | Good | Avoid ammonia contamination |
| General Seawater Corrosion | Good | Suitable for clean seawater, brackish water |
| Galvanic Corrosion | Moderate | More anodic than Cu-Ni; proper isolation needed |
| Microbiologically Influenced Corrosion | Moderate | Less resistant than Cu-Ni alloys |
Fabrication & Manufacturing Properties
| Fabrication Aspect | Characteristics |
|---|---|
| Cold Workability | Excellent (can be extensively drawn) |
| Hot Workability | Poor (not recommended) |
| Machinability | Fair (20% of free-cutting brass) |
| Weldability | Poor; requires specialized techniques |
| Brazing/Soldering | Excellent |
| Stress Relief | Required after severe bending (260-370°C) |
Standard Specifications & Forms
| Standard | Designation | Typical Forms |
|---|---|---|
| ASTM | B111/B111M | Seamless condenser & heat exchanger tubes |
| ASME | SB111 | Pressure vessel & heat exchanger tubes |
| DIN | 1786 | CuZn28Sn1 (similar alloy) |
| JIS | H3300 C4430 | Condenser tubes |
| Common Sizes | OD: 12.7 - 38.1 mm | Wall: 0.71 - 2.11 mm |
| Tempers | Annealed (O), Hard Drawn (H) | Light Drawn (LD) |
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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).
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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).
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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.
