C44300 – Admiralty brass – CuZn28Sn1
The anti-corrosive properties of Admiralty brass are well-suited to use with contaminated water.
Inhibited Admiralty brass tubes (C44300) are tubes made of a copper-zinc alloy with a small addition of tin and a corrosion inhibitor, engineered for outstanding resistance to polluted or saline water. With over 70% copper content, they offer a strong combination of durability, thermal conductivity, and anti-corrosive performance in heat transfer systems, as detailed in our in-depth guide to admiralty brass applications.
Inhibited admiralty brass tubes are commonly used in steam condensers, especially those cooled with fresh, salt, or brackish water, and are trusted in industries such as power generation, oil refining, and marine engineering. The alloy withstands aggressive media, including sulfur-bearing compounds, and performs reliably under high-pressure and temperature conditions.
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C44300 Admiralty brass tubes are commonly used in:
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Steam condensers exposed to fresh, brackish, or seawater
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Feedwater heaters in power generation plants
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Heat exchangers in oil refineries and chemical plants
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Cooling systems in marine and offshore environments
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Desalination units and water treatment facilities
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Thermal equipment operating under corrosive and polluted conditions
Key benefits
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High corrosion resistance in contaminated water: inhibited alloy resists dezincification, pitting, and erosion in polluted and saline environments.
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Reliable performance in aggressive media: withstands sulfur compounds and organic contaminants found in oil refining and chemical processing.
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Thermal conductivity for efficient heat exchange: maintains stable performance across temperature cycles and varying water quality.
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Good mechanical strength and ductility: suitable for high-pressure systems and thermal cycling.
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Long service life in industrial environments: reduces maintenance needs in harsh conditions.
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Compliance with global standards: manufactured to meet ASTM B111 and other relevant specifications.
C44300 IN SERVICE
Condenser retubing project for Embalse Nuclear Power Plant
“Working with Admiralty Industries on the supply of condenser tubes for the Embalse Nuclear Power Plant was a highly constructive and reliable experience.”
– Client feedback
Nucleoeléctrica Argentina S.A. — Embalse Nuclear Power Plant
- Alloy: C44300 admiralty brass (CuZn28Sn1)
- Scope: 11,600 condenser tubes for the retubing of the main condenser
- Dimensions: 25.40 mm OD × 1.24 mm min wall × 10,070 mm length
- Standards: supplied and certified to ASTM B111 (UNS C44300)
- Application: main condenser, CANDU pressurized heavy water reactor
Technical specifications
UNS no.
SB 111, SB 395
Properties and metrics
Properties *
Metric
English
Density
8.53 g/cc
Tensile strength
8.94 g/cm³
Yield strength
105 MPa
15 ksi
CTE, linear
20.2 10-6/°C @ 20 – 300°C
11.2 10-6/°F @ 70 – 570°F
Thermal conductivity
109 W/m-K @ 20°C
64 BTU/ft2/ft/h/°F @ 70°F
Melting point
899 ~ 938°C
1650 ~ 1720°F
Frequently asked questions about admiralty brass
What is admiralty brass?
Admiralty brass (C44300) is a copper-zinc-tin alloy with excellent corrosion resistance in seawater. It is commonly used in condenser and heat exchanger tubes in marine and industrial environments.
What is the difference between brass and admiralty brass?
While standard brass is primarily a copper-zinc alloy, admiralty brass includes a small amount of tin (usually 1%) to improve resistance to dezincification and corrosion in seawater applications.
What is admiralty brass used for?
Admiralty brass is used in marine condensers, heat exchangers, desalination plants, and other applications where corrosion resistance in brackish or seawater is critical.