Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of UNS C44400 Admiralty Brass Tube Supplier | ASTM B111 Seamless Copper Zinc Tin Alloy Tube for Marine Condensers & Heat Exchangers in China, also supports customized service. With abundant experience, we warmly welcome you to wholesale cheap products in stock here and get free sample from our factory. For price consultation, contact us.
UNS C44400 Admiralty Brass Tube is a high-performance copper-zinc-tin alloy tube specifically designed for heat transfer and seawater service applications.
Compared with conventional brass tubing, C44400 contains controlled additions of tin (Sn) and arsenic/antimony inhibitors that significantly improve:
Resistance to dezincification
Seawater corrosion resistance
Erosion-corrosion performance
Long-term reliability in condenser systems
Because of its excellent thermal conductivity and cost-effective corrosion resistance, UNS C44400 is widely used as an economical alternative to copper-nickel alloys in industrial cooling systems.
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High Quality
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What is Admiralty Brass?
Admiralty Brass is a traditional marine-grade copper alloy developed for use in steam condensers and seawater heat exchangers.
Typical composition:
~71% Copper
~28% Zinc
~1% Tin
The addition of tin forms a more stable protective surface film, greatly reducing corrosion attack in marine environments.
This makes C44400 especially suitable for:
Brackish water
Polluted cooling water
Low to medium velocity seawater systems
UNS C44400 Admiralty Brass Tube Size Range
Our UNS C44400 Admiralty Brass Tubes are available in a wide range of seamless condenser and heat exchanger tube dimensions for marine, industrial cooling, desalination, and power generation applications.
Production is available according to:
ASTM B111
ASME SB111
EN 12449
DIN 1785
Custom dimensions and OEM fabrication are supported.
Metric Tube Size Range
| Outside Diameter (OD) | Wall Thickness (WT) | Standard Length |
|---|---|---|
| 6 mm | 0.5 – 1.5 mm | Up to 6000 mm |
| 8 mm | 0.5 – 2.0 mm | Up to 6000 mm |
| 10 mm | 0.5 – 2.0 mm | Up to 6000 mm |
| 12 mm | 0.5 – 2.5 mm | Up to 9000 mm |
| 15 mm | 0.7 – 3.0 mm | Up to 9000 mm |
| 16 mm | 0.7 – 3.0 mm | Up to 9000 mm |
| 19 mm | 0.7 – 3.5 mm | Up to 12000 mm |
| 22 mm | 0.9 – 4.0 mm | Up to 12000 mm |
| 25 mm | 1.0 – 4.5 mm | Up to 12000 mm |
| 28 mm | 1.0 – 5.0 mm | Up to 12000 mm |
| 32 mm | 1.2 – 5.0 mm | Up to 12000 mm |
| 38 mm | 1.2 – 6.0 mm | Up to 12000 mm |
| 42 mm | 1.5 – 6.0 mm | Up to 12000 mm |
| 50 mm | 1.5 – 8.0 mm | Up to 12000 mm |
| 63 mm | 2.0 – 8.0 mm | Up to 12000 mm |
| 76 mm | 2.0 – 10.0 mm | Up to 12000 mm |
| 89 mm | 2.5 – 10.0 mm | Up to 12000 mm |
| 102 mm | 3.0 – 10.0 mm | Up to 12000 mm |
| 120 mm | 3.0 – 12.0 mm | Up to 12000 mm |
Imperial Tube Size Range
| Nominal Size | Outside Diameter | Wall Thickness Options |
|---|---|---|
| 1/4" | 6.35 mm | 22 BWG – 16 BWG |
| 3/8" | 9.53 mm | 22 BWG – 14 BWG |
| 1/2" | 12.70 mm | 22 BWG – 12 BWG |
| 5/8" | 15.88 mm | 20 BWG – 10 BWG |
| 3/4" | 19.05 mm | 20 BWG – 10 BWG |
| 1" | 25.40 mm | 18 BWG – 8 BWG |
| 1-1/4" | 31.75 mm | 18 BWG – 6 BWG |
| 1-1/2" | 38.10 mm | 16 BWG – 6 BWG |
| 2" | 50.80 mm | 16 BWG – 4 BWG |
| 2-1/2" | 63.50 mm | 14 BWG – 4 BWG |
| 3" | 76.20 mm | 12 BWG – 3 BWG |
| 4" | 101.60 mm | 10 BWG – 3 BWG |
| 5" | 127.00 mm | SCH 10 – SCH 80 |
BWG Wall Thickness Reference Table
| BWG | Thickness (mm) | Thickness (inch) |
|---|---|---|
| 22 BWG | 0.711 mm | 0.028" |
| 20 BWG | 0.889 mm | 0.035" |
| 18 BWG | 1.245 mm | 0.049" |
| 16 BWG | 1.651 mm | 0.065" |
| 14 BWG | 2.108 mm | 0.083" |
| 12 BWG | 2.769 mm | 0.109" |
| 10 BWG | 3.404 mm | 0.134" |
| 8 BWG | 4.191 mm | 0.165" |
| 6 BWG | 5.156 mm | 0.203" |
| 4 BWG | 6.553 mm | 0.258" |
Available Tube Supply Types
Heat Exchanger Tube
High thermal conductivity tubing for condensers and cooling systems.
Condenser Tube
Seamless tubing for seawater and steam condenser applications.
Marine Brass Tube
Corrosion-resistant tube for offshore and marine engineering.
Precision Brass Tube
Tight tolerance tubing for industrial equipment manufacturing.
Chemical Composition of UNS C44400 Admiralty Brass Tube
| Element | Composition (%) | Function |
|---|---|---|
| Copper (Cu) | 70.0 – 73.0 | Thermal conductivity & corrosion resistance |
| Zinc (Zn) | Balance | Mechanical strength |
| Tin (Sn) | 0.8 – 1.2 | Anti-dezincification protection |
| Lead (Pb) | ≤ 0.07 | Improves machinability |
| Iron (Fe) | ≤ 0.06 | Grain stabilization |
| Antimony (Sb) | 0.02 – 0.10 | Corrosion inhibition |
Mechanical Properties of UNS C44400 Tube
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength | 350 – 450 MPa | 50 – 65 ksi |
| Yield Strength | 120 – 220 MPa | 17 – 32 ksi |
| Elongation | 15 – 65% | - |
| Hardness | 60 – 90 HRB | - |
| Elastic Modulus | 110 GPa | 15,950 ksi |
| Density | 8.5 g/cm³ | 0.307 lb/in³ |
Physical & Thermal Properties
| Property | Value |
|---|---|
| Thermal Conductivity | 120 – 150 W/m·K |
| Electrical Conductivity | 20 – 30% IACS |
| Specific Heat Capacity | 377 J/kg·K |
| Thermal Expansion Coefficient | 20 × 10⁻⁶ /K |
| Melting Range | 885 – 900°C |
| Magnetic Property | Non-Magnetic |
Corrosion Resistance Characteristics
UNS C44400 Admiralty Brass Tube demonstrates excellent resistance in:
Seawater Systems
Natural seawater
Brackish water
Salt spray environments
Industrial Cooling Water
Cooling towers
Condenser circulation systems
Industrial process water
Chloride Environments
Marine atmosphere
Offshore engineering
Coastal industrial facilities
Dezincification Resistance Mechanism
One of the major failure modes of ordinary brass tubes is dezincification, where zinc is selectively removed from the alloy structure.
The addition of tin and inhibitor elements in C44400:
Reduces zinc dissolution
Stabilizes the copper matrix
Forms protective oxide films
Extends service life in chloride-rich environments
This is why Admiralty Brass remains one of the most widely used condenser tube materials worldwide.
Thermal Performance Advantages
UNS C44400 offers:
High thermal conductivity
Efficient heat transfer efficiency
Low thermal resistance
Stable thermal cycling performance
This makes it ideal for:
Steam surface condensers
Heat exchanger tubing
Industrial refrigeration systems
Power generation cooling systems
Standard Tube Conditions
| Condition | Description |
|---|---|
| Annealed | Excellent bending performance |
| Light Drawn | Improved dimensional accuracy |
| Hard Drawn | Higher strength |
Manufacturing Process of Admiralty Brass Tube
The production process includes:
Copper alloy melting
Continuous casting
Hot extrusion
Multi-pass cold drawing
Intermediate annealing
Bright annealing
Straightening
Eddy current inspection
Hydrostatic pressure testing
Final dimensional inspection
Heat Exchanger Tube Applications
Shell & Tube Heat Exchangers
Used for:
Petrochemical plants
Power stations
Refineries
Industrial cooling systems
Marine Condensers
Applied in:
Shipboard cooling systems
Offshore cooling modules
Seawater condensers
Desalination Equipment
Suitable for:
Multi-stage flash evaporators
Saltwater cooling systems
Thermal desalination plants
UNS C44400 vs Copper Nickel Tubes
| Property | C44400 Admiralty Brass | C70600 CuNi 90/10 |
|---|---|---|
| Thermal Conductivity | Higher | Medium |
| Cost | Lower | Higher |
| Corrosion Resistance | Excellent | Superior |
| Biofouling Resistance | Good | Excellent |
| Typical Use | Condensers | Offshore seawater piping |
UNS C44400 vs C68700 Aluminum Brass
| Alloy | Main Advantage | Typical Application |
|---|---|---|
| C44400 | Cost-effective seawater resistance | Standard condensers |
| C68700 | Higher erosion resistance | High-velocity seawater |
Tube Testing & Inspection
All tubes are inspected according to ASTM standards.
Non-Destructive Testing
Eddy current testing
Ultrasonic testing
Hydrostatic pressure testing
Air under water testing
Mechanical Testing
Flattening test
Flaring test
Tensile test
Hardness test
Corrosion Testing
Ammonia vapor test
Dezincification resistance evaluation
Salt spray testing
Inspection & Quality Assurance
All UNS C44400 Admiralty Brass Tubes are produced under strict quality management systems.
Quality Control Procedures
Raw material verification
PMI positive material identification
Chemical composition analysis
Mechanical performance validation
Dimensional inspection
Third-Party Inspection
Available by:
SGS
BV
TÜV
DNV
Certification
EN 10204 3.1
ISO 9001
Mill Test Certificate (MTC)
Product Delivery Standards
Surface Finish
Bright Annealed
Polished
Pickled
Mill Finish
Packaging
Wooden box packing
Waterproof export packing
Anti-collision protection
Delivery Options
Straight length tubes
U bend tubes
Custom fabricated tubing
Global Export Markets
Our UNS C44400 Admiralty Brass Tubes are exported to:
USA
Canada
Germany
Italy
Saudi Arabia
UAE
Singapore
South Korea
Why Choose Our UNS C44400 Tube?
Stable Raw Materials
Strict alloy composition control ensures stable corrosion resistance.
Advanced Tube Manufacturing
High-precision cold drawing and annealing technology.
Rich Export Experience
Professional export packaging and international standards compliance.
Customized Production
OEM dimensions and custom fabrication supported.
FAQ
What is UNS C44400 Admiralty Brass Tube used for?
It is mainly used in marine condensers, heat exchangers, power plant cooling systems, and seawater heat transfer equipment.
Is C44400 suitable for seawater applications?
Yes. It is specifically developed for seawater corrosion resistance and anti-dezincification performance.
What standard is commonly used for Admiralty Brass tubes?
ASTM B111 is the most widely used standard for seamless condenser tubes.
What is the difference between Admiralty Brass and Aluminum Brass?
Admiralty Brass has excellent cost-performance balance, while Aluminum Brass offers better erosion resistance in high-velocity seawater systems.
Can custom tube sizes be supplied?
Yes. Custom OD, wall thickness, length, and bending fabrication are available.
Contact Us
Xi'an Dongmeng Group Co., Ltd
Professional Supplier of:
Copper Alloy Tubes
Admiralty Brass Tubes
Heat Exchanger Tubes
Marine Copper Alloy Materials
Stainless Steel & Nonferrous Metal Products
Sales Contact
📞 Phone / WhatsApp / WeChat
+8615769214734
📧 Email
office@dongmjd.com
Request a Quote
Please send us your requirements including:
Material Grade
Tube Size
Wall Thickness
Quantity
Standard
Application
Our technical sales team will provide fast support and professional solutions.
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