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Introduction of C44300 Admiralty Brass Tube
ASTM B111 C44300 refers to seamless tubes made from Admiralty Brass, a copper-zinc-tin alloy known for its excellent corrosion resistance, especially in marine and industrial heat exchanger applications. C44300 contains about 70% copper, 28% zinc, and 1% tin, with a small amount of arsenic to prevent dezincification.
These tubes are widely used in condenser and heat exchanger systems, particularly in freshwater and brackish water environments, due to their high thermal conductivity, good strength, and resistance to biofouling and erosion. Manufactured according to ASTM B111, the tubes are typically supplied in annealed (O61) or light-drawn tempers, making them suitable for tube expansion, bending, and fabrication.
C44300 Admiralty Brass Tube – Overview
| UNS Designation | C44300 |
|---|---|
| Common Name | Admiralty Brass |
| Standards | ASTM B111 (for seamless condenser and heat exchanger tubes) |
| Composition | ~70% Copper, ~28% Zinc, ~1% Tin, small amounts of Iron |
| Form | Seamless tube (most common), rolled, drawn |
Chemical Composition (%) (Typical Range per ASTM B111)
| Element | Percentage (%) |
|---|---|
| Copper (Cu) | 70.0 – 73.0 |
| Zinc (Zn) | Remainder (~27–29) |
| Tin (Sn) | 0.9 – 1.2 |
| Iron (Fe) | 0.06 max |
| Lead (Pb) | 0.07 max |
Mechanical Properties (Annealed Condition)
| Property | Value (Typical) |
|---|---|
| Tensile Strength | 310 – 450 MPa |
| Yield Strength (0.5% ext.) | ~125 MPa |
| Elongation (in 50 mm) | ≥ 30% |
| Hardness | ~65 HRB |
Key Features of ASTM B111 C44300 tubes
Excellent corrosion resistance in fresh, salt, and brackish water.
Tin addition improves resistance to dezincification.
Good thermal conductivity.
Non-sparking, non-magnetic.
Easily fabricated, soldered, and brazed.
Applications of ASTM B111 C44300 tubes
Heat exchangers
Condenser tubes (especially in steam power plants)
Seawater cooling systems
Desalination units
Evaporators
