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UNS C44500 Copper-Zinc-Tin Alloy, commonly known as Admiralty Brass or Arsenical Brass, is a high-performance copper-zinc alloy containing small additions of tin and arsenic that enhance corrosion resistance in seawater and brackish environments. With approximately 70% copper, 29% zinc, and 1% tin, C44500 provides a perfect balance of strength, ductility, and heat transfer efficiency, making it ideal for marine condensers, heat exchangers, desalination equipment, and oil refineries.
Manufactured in compliance with ASTM B111, ASTM B171, ASTM B122, and EN 12451, C44500 Admiralty Brass Tubes and Plates are widely used in shipbuilding, power plants, and offshore cooling systems for their outstanding resistance to dezincification and biofouling.
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What Is UNS C44500 Copper-Zinc-Tin Alloy?
UNS C44500 is a tin-bearing Admiralty Brass alloy mainly composed of copper, zinc, and tin with small arsenic additions for enhanced corrosion resistance. The tin element significantly improves resistance to dezincification in seawater and brine environments, making C44500 ideal for condenser tubes and marine heat exchangers.
Compared with ordinary brass alloys, C44500 offers:
Better seawater corrosion resistance
Improved resistance to stress corrosion cracking
Excellent heat transfer performance
Long service life in cooling systems
Good formability and weldability
This alloy offers an excellent balance of good corrosion resistance (especially against seawater and industrial atmospheres), moderate to high strength, good formability, and excellent solderability. The presence of residual phosphorus contributes to its durability.
Keywords: UNS C44500, Admiralty Brass, Arsenical Brass Tube, Copper-Zinc-Tin Alloy, ASTM B111 Copper Alloy Tube, Heat Exchanger Brass Tube, Marine Condenser Tube, Brass Plate Supplier, EN 12451 CW706R, C44500 Brass Pipe Manufacturer.
Chemical Composition (Typical %)
| Element | Cu | Zn | Sn | As | Pb | Fe | Others |
|---|---|---|---|---|---|---|---|
| Content (%) | 70.0 | Balance | 0.9 – 1.2 | 0.02 – 0.06 | ≤0.05 | ≤0.05 | - |
Mechanical Properties (Typical)
| Property | Annealed | Hard Drawn (H55) | Standard |
|---|---|---|---|
| Tensile Strength (MPa) | 340 – 460 | 480 – 520 | ASTM B111 |
| Yield Strength (MPa) | 120 – 170 | 170 – 230 | ASTM B111 |
| Elongation (%) | ≥30 | ≥10 | ASTM B111 |
| Hardness (HV) | 80 – 120 | 130 – 160 | ASTM B111 |
| Density | 8.53 g/cm³ | - | - |
| Thermal Conductivity | 120 W/m·K | - | - |
| Electrical Conductivity | 26% IACS | - | - |
| Max Working Temp | 250°C (482°F) | - | - |
Product Forms & Standard Sizes
1. Seamless Tube / Pipe (ASTM B111 / EN 12451)
| OD (inch) | OD (mm) | Wall Thickness (mm) | Length | Temper | Application |
|---|---|---|---|---|---|
| 1/4″ | 6.35 | 0.7 | 3 – 6 m | Annealed (O61) | Heat exchanger tubing |
| 3/8″ | 9.52 | 0.9 | 3 – 6 m | Light drawn | Condenser tubing |
| 1/2″ – 1″ | 12.7 – 25.4 | 1.0 – 2.0 | 3 – 6 m | O61 / H55 | Power plant cooling |
| 1″ – 4″ | 25.4 – 101.6 | 1.5 – 5.0 | 3 – 6 m | Annealed | Oil refinery systems |
| Up to 8″ | 203 mm | 1.5 – 6.0 | Custom | Annealed | Marine & desalination |
2. Plate & Sheet (ASTM B171 / B122)
| Thickness (mm) | Width (mm) | Length (mm) | Finish | Application |
|---|---|---|---|---|
| 1.0 – 3.0 | 600 – 1200 | 2000 – 3000 | Bright | Condenser plates |
| 4.0 – 25.0 | 600 – 1500 | 2000 – 6000 | Hot Rolled | Tube sheets |
| 30.0 – 50.0 | 600 – 1200 | Custom | Machined | Structural plates |
3. Rod & Bar (ASTM B16 / B453)
| Diameter (mm) | Length | Temper | Application |
|---|---|---|---|
| 6 – 150 | 3 m | H55 | Flanges, valves, fittings |
4. Coil / Strip (ASTM B122)
| Thickness (mm) | Width (mm) | Coil Weight | Finish | Application |
|---|---|---|---|---|
| 0.2 – 2.0 | 10 – 400 | 50 – 200 kg | Smooth / Polished | Flexible tube forming |
5. Fittings & Flanges
| Type | Size Range | Standard | Application |
|---|---|---|---|
| Elbow / Tee / Reducer | 1/2″ – 12″ | ASTM B111 | Cooling systems |
| Flange (Slip-on / Weld Neck) | 1/2″ – 24″ | ASTM B171 | Power plant piping |
Features & Advantages
Excellent Seawater Corrosion Resistance
The tin addition helps form a protective surface layer, significantly improving resistance to seawater attack and dezincification.
High Thermal Conductivity
Ideal for condensers and heat exchangers requiring efficient heat transfer performance.
Long Service Life
Suitable for continuous operation in marine and industrial cooling systems.
Good Fabrication Performance
Easy to bend, expand, machine, weld, and fabricate into custom components.
Strong Anti-Biofouling Performance
Widely used in marine heat exchange systems exposed to biological seawater contamination.
UNS C44500 Copper-Zinc-Tin Alloy (Admiralty Brass / Arsenical Brass) Applications
Marine Engineering
Shipbuilding systems
Offshore platforms
Marine cooling pipelines
Seawater valves & pumps
Desalination Plants
Saltwater evaporators
Brine transport systems
Thermal desalination equipment
Heat Exchanger Industry
Condenser tubes
Shell & tube heat exchangers
Power station cooling systems
Industrial cooling equipment
Petrochemical Industry
Chemical condensers
Corrosion-resistant pipelines
Cooling circulation systems
Inspection & Quality Assurance
We implement strict inspection procedures for all UNS C44500 copper alloy products.
Inspection Items
Chemical composition analysis
Tensile strength testing
Hardness testing
Eddy current testing
Hydrostatic pressure testing
Dimensional inspection
Surface quality inspection
Third-Party Inspection
Available by:
SGS
BV
TÜV
Intertek
Certificates
EN 10204 3.1 / 3.2
Mill Test Certificate (MTC)
PMI Test Report
Packing List
Certificate of Origin
FAQ - Frequently Asked Questions
Q1: What makes UNS C44500 better than standard brass for marine use?
A1: C44500 contains tin and arsenic, providing superior dezincification and corrosion resistance, unlike standard C26000 brass which deteriorates in seawater.
Q2: Is C44500 suitable for condenser and heat exchanger tubes?
A2: Yes. It's specifically designed for heat transfer applications, combining high conductivity and corrosion resistance.
Q3: Can Admiralty Brass (C44500) be welded?
A3: Yes. It can be welded or brazed with suitable brass filler metals (AWS A5.8 RBCuZn-C). Post-weld cleaning is recommended to prevent scaling.
Q4: How does C44500 compare to Aluminum Brass (C68700)?
A4: C44500 is ideal for clean seawater; C68700 Aluminum Brass performs better in more polluted or turbulent seawater due to its aluminum oxide film.
Q5: What's the recommended maximum water velocity for C44500 tubes?
A5: Approximately 2.5–3.0 m/s, depending on tube diameter and water quality.
Q6: What test certificates are supplied?
A6:
EN 10204 3.1 / 3.2 MTC
Eddy Current & Hydrostatic Tests
Chemical & Mechanical Analysis Reports
Dimensional Inspection & Visual Examination
Packaging & Supply
Length: 3 m / 6 m or custom cut
Finish: Mill, bright, or polished
Marking: Alloy grade + standard + heat number
Packaging: Plastic-capped bundles, seaworthy wooden cases
Inspection: 100% hydrostatic or eddy-current tested
Looking for a reliable UNS C44500 Admiralty Brass Tube or Plate Supplier?
We provide ASTM B111 / B171 compliant copper-zinc-tin alloys for marine, refinery, and heat transfer industries - globally exported with MTC certification.
✅ OEM / Custom fabrication available
✅ Fast delivery & professional export packaging
✅ Technical support and drawings available
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Our address
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
Phone Number
+86 15769214734
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