Inhibited Admiralty Brass tubes – C44300 – have high corrosion resistance, and are primarily used for tubing of steam condensers cooled with fresh, salt, or brackish water. They are also used for heat exchangers in oil refineries, in which the corrosion from sulfur compounds and contaminated water may be very severe. For industrial processes, C44300 Admiralty Brass Tubes are used for feed-water heaters and heat-exchanger equipment.
Technical Specifications
| Specification Category | Details |
|---|---|
| UNS No. | C44300 |
| BSI No. | CZ111 |
| ISO Name | CuZn28Sn1 |
| Chemical Comp. (%) | Cu 70 ~ 73 / Sn 0.9 ~ 1.2 / Pb 0.07 max / Fe 0.06 max / Zn rem / As 0.02 ~ 0.06 |
| ASTM Spec. | B 111, B 395 |
| ASME Spec. | SB 111, SB 395 |
| Applications | Condenser, Evaporator and Heat Exchanger tubes; Distiller tubing. |
| Temper | O61 Annealed |
Properties
| Property | Metric | English |
|---|---|---|
| Density | 8.53 g/cc | 0.308 lb/in³ |
| Tensile Strength, min. | 310 MPa | 45 ksi |
| Yield Strength, min. | 105 MPa | 15 ksi |
| CTE, linear | 20.2 x 10⁻⁶ /°C @ 20.0 – 300 °C | 11.2 x 10⁻⁶ /°F @ 70.0 – 570 °F |
| Specific Heat Capacity | 0.09 cal/g-°C @ 20°C | 0.09 BTU/lb-°F @ 70°F |
| Thermal Conductivity | 109 W/m-K @ 20.0 °C | 64 BTU/ft²/ft/h/°F @ 70.0 °F |
| Melting Point | 899 ~ 938 °C | 1650 ~ 1720 °F |
FAQ
1. What is C44300 equivalent to?
C44300 Admiralty Brass is directly equivalent to BSI CZ111 (British Standard) and ISO CuZn28Sn1 (International Standard). These designations share identical chemical requirements and are fully interchangeable in ASTM B111 / ASME SB111 condenser tube specifications worldwide.
2. What is the ASTM standard for C44300?
C44300 Admiralty Brass Tubes are manufactured to ASTM B111 for straight-length seamless condenser tubes and ASTM B395 for U-bend configurations. Pressure vessel applications require ASME SB111 and ASME SB395 compliance.
3. C44300 vs C68700: What is the difference?
C44300 Admiralty Brass is inhibited with arsenic to prevent dezincification in polluted, stagnant, or sulfide-bearing water. It excels in oil refinery condensers where water quality is poor. C68700 Aluminum Brass is alloyed with aluminum to resist impingement erosion in high-velocity clean seawater. Selection depends on whether the primary threat is chemical attack (C44300) or mechanical erosion (C68700).
4. C44300 vs C70600: Which is better for polluted water?
C44300 Admiralty Brass is often preferred for polluted, sulfide-containing brackish water because its arsenic inhibitor actively prevents dezincification. C70600 CuNi (90/10) offers broader corrosion resistance but at significantly higher cost. For refinery overhead condensers handling contaminated water, C44300 provides the optimal cost-performance balance.
5. Why does C44300 resist dezincification while standard brass fails?
Standard brass (e.g., C28000) loses zinc preferentially in water service, becoming porous and weak. C44300 Admiralty Brass contains 0.02-0.06% Arsenic as an inhibitor, which forms a protective surface film that blocks zinc leaching. This is why "Inhibited" Admiralty Brass is mandatory for condenser service.
6. What temper is C44300 supplied for tube rolling applications?
C44300 Admiralty Brass Tubes are supplied in O61 (Annealed) temper. This soft condition provides the ductility required for roller expansion and flaring into tube sheets without cracking. Harder tempers are unsuitable for tube rolling and will cause installation failures.
7. What are typical applications for C44300 Admiralty Brass Tubes?
C44300 Admiralty Brass Tubes are specified for steam surface condensers (power generation), crude unit overhead condensers (oil refining), feedwater heaters, evaporators, and desalination distiller tubing. They are ideal wherever cooling water contains sulfides, ammonia, or organic contaminants.
8. Can C44300 be used in high-velocity seawater service?
C44300 Admiralty Brass is not recommended for sustained high-velocity seawater (>2.5 m/s). Under such conditions, the protective film can be stripped away, leading to impingement erosion. For high-velocity seawater, C68700 Aluminum Brass or C70600 CuNi are better choices.
9. What is the annealing process for C44300 Admiralty Brass Tubes?
C44300 Admiralty Brass Tubes undergo a full anneal at approximately 450-550°C followed by controlled cooling. This O61 temper relieves cold-working stresses and restores the ductile microstructure necessary for tube expansion and service under thermal cycling.
How Do We Package Copper Heat Exchanger Tubes for Global Delivery?
Poor packaging destroys even the best copper heat exchanger tube. As a professional copper heat exchanger tube factory serving copper heat exchanger tube USA, Europe, UAE, Saudi Arabia, and India, we follow military-grade export packaging standards to ensure zero damage during sea or air freight.
Our Standard Packaging Process:
| Packaging Stage | Material / Method | Purpose |
|---|---|---|
| Individual Tube Protection | Anti-rust VCI paper + plastic end caps | Prevents moisture, dust, and scratches on copper tube heat exchanger inner surfaces. |
| Bundling | Nylon straps + wooden spacers | Keeps copper heat exchanger tube OD 19mm, 1 inch, or 5/8 inch sizes organized and vibration-free. |
| Moisture Barrier | Thick PE film wrap (heat-shrunk) | Blocks humidity during long sea voyages to copper heat exchanger tube Germany or Saudi Arabia. |
| Outer Packing | Export-grade plywood cases or steel-banded wooden crates | Withstands stacking and rough handling. Each crate labeled with PO number, alloy (e.g., SB111 C70600), and quantity. |
| Documentation | Packing list + Mill Test Certificate (MTC) attached outside | Customs clearance support for copper heat exchanger tube stockist and distributor partners. |
For U-Bundle Orders: U tube heat exchanger and U tube bundle heat exchanger are placed in dedicated steel jigs inside the crate to prevent bending radius distortion.
Our Factory & Equipment
| Equipment Type | Specification / Capability | Quality Impact |
|---|---|---|
| Horizontal Continuous Casting Line | 10-ton capacity | Produces homogeneous copper alloy tube for heat exchanger billets with zero porosity. |
| Three-Roll Piercing Mill | Up to 60mm OD | Precision wall thickness control for heat exchanger tube wall thickness as low as 0.5mm. |
| Cold Drawing Bench | 5 draws in sequence | Achieves tight tolerances on copper heat exchanger tube length and heat exchanger pipe diameter. |
| Straightening & Cutting Line | CNC servo-controlled | Burr-free cutting for copper heat exchanger tube 3/4 inch and 1 inch to exact project lengths. |
| U-Bending Machine | CNC mandrel type | Produces u tube condenser and U tube bundle heat exchanger without kinking or ovality. |
| Eddy Current Tester | NDT (Non-Destructive Testing) | 100% inspection of C70600 tube and C71500 tube for pinholes or cracks per ASTM B111 pdf standards. |
| Hydrostatic Tester | Up to 200 bar | Validates heat exchanger tube expansion and tube rolling integrity. |
| Spectrometer | Optical emission (OES) | Confirms chemical composition of ASME SB111, EN 12451, and JIS H3300 grades on every batch. |
Our Certifications & Compliance:
ASTM B111 pdf and ASME SB111 pdf full traceability.
ISO 9001:2015 quality management system.
Third-party inspection accepted: SGS, BV, Lloyds, or TUV.
Copper heat exchanger tube life expectancy testing reports available upon request.
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