UNS C44300, commonly known as Admiralty Brass or Arsenical Brass, is an inhibited copper-zinc-tin alloy widely specified for condenser and heat exchanger tubing in marine, power generation, and oil refinery applications. When sourcing this material globally, procurement specialists and engineers frequently encounter different national and international designation systems. Understanding the equivalent grades for C44300 is essential for ensuring material compliance, avoiding supply chain delays, and maintaining project specifications. GNEE supplies C44300 Admiralty Brass and its international equivalents from China, fully compliant with ASTM, ASME, BS, and ISO standards.
Primary International Equivalents for C44300
The following table summarizes the direct equivalent designations for UNS C44300 Admiralty Brass across major international standards:
| Standard / Region | Equivalent Designation | Description |
|---|---|---|
| UNS (Unified Numbering System) | C44300 | North American designation for inhibited Admiralty Brass |
| British Standard (BSI) | CZ111 | UK designation for Admiralty Brass condenser tubes |
| International Standard (ISO) | CuZn28Sn1 | ISO compositional designation (Copper-Zinc-Tin) |
| European Standard (EN) | CuZn28Sn1As | EN designation indicating the Arsenic inhibitor addition |
| Japanese Industrial Standard (JIS) | C4430 | JIS designation for Admiralty Brass (note: one less zero) |
| ASTM Specification | ASTM B111 Grade C44300 | Seamless condenser tube specification |
| ASME Specification | ASME SB111 Grade C44300 | Pressure vessel code specification |
Detailed Breakdown of Each Equivalent Designation
BSI CZ111 (British Standard)
CZ111 is the British Standard designation for inhibited Admiralty Brass. It is functionally identical to UNS C44300 with the same chemical composition requirements: 70-73% Copper, 0.9-1.2% Tin, and 0.02-0.06% Arsenic. Tubes manufactured to CZ111 are fully interchangeable with ASTM B111 C44300 tubes in condenser and heat exchanger service.
ISO CuZn28Sn1 (International Standard)
CuZn28Sn1 is the ISO compositional designation that describes the nominal alloy composition:
Cu = Copper base
Zn28 = Approximately 28% Zinc
Sn1 = Approximately 1% Tin
This designation does not explicitly include the Arsenic inhibitor in the name, but the full ISO specification includes the 0.02-0.06% As requirement for inhibited grade.
EN CuZn28Sn1As (European Standard)
CuZn28Sn1As is the European Norm (EN) designation. The "As" suffix explicitly identifies the Arsenic addition that distinguishes inhibited Admiralty Brass from uninhibited grades. This is the most precise compositional designation, clearly indicating all key alloying elements.
JIS C4430 (Japanese Industrial Standard)
C4430 is the JIS designation for Admiralty Brass. Note the subtle difference in numbering: UNS uses five digits (C44300) , while JIS uses four digits (C4430) . The chemical and mechanical requirements are effectively identical, and material certified to JIS C4430 is generally acceptable under ASTM B111 specifications.
Chemical Composition Equivalency Table
The following table confirms that all equivalent designations share identical chemical composition requirements:
| Element | UNS C44300 | BSI CZ111 | ISO CuZn28Sn1 | EN CuZn28Sn1As | JIS C4430 |
|---|---|---|---|---|---|
| Copper (Cu) | 70.0 – 73.0% | 70.0 – 73.0% | 70.0 – 73.0% | 70.0 – 73.0% | 70.0 – 73.0% |
| Tin (Sn) | 0.9 – 1.2% | 0.9 – 1.2% | 0.9 – 1.2% | 0.9 – 1.2% | 0.9 – 1.2% |
| Arsenic (As) | 0.02 – 0.06% | 0.02 – 0.06% | 0.02 – 0.06% | 0.02 – 0.06% | 0.02 – 0.06% |
| Lead (Pb) | 0.07% max | 0.07% max | 0.07% max | 0.07% max | 0.07% max |
| Iron (Fe) | 0.06% max | 0.06% max | 0.06% max | 0.06% max | 0.06% max |
| Zinc (Zn) | Remainder | Remainder | Remainder | Remainder | Remainder |
Applicable ASTM and ASME Specifications
In addition to national designations, C44300 material equivalency extends to specific product form specifications:
| Specification | Scope | Designation Used |
|---|---|---|
| ASTM B111 / ASME SB111 | Seamless condenser and heat exchanger tubes | C44300 |
| ASTM B395 / ASME SB395 | U-bend seamless condenser tubes | C44300 |
| ASTM B135 | Seamless brass tube | C44300 |
| ASTM B359 / ASME SB359 | Seamless copper and copper-alloy condenser tubes with integral fins | C44300 |
| ASTM B543 / ASME SB543 | Welded copper and copper-alloy heat exchanger tube | C44300 |
Materials Commonly Confused with C44300
It is important to distinguish C44300 equivalents from similar but non-equivalent materials:
| Material | Designation | Key Difference | Interchangeable with C44300? |
|---|---|---|---|
| Uninhibited Admiralty Brass | C44100 / C44200 | Lacks Arsenic inhibitor | No – Will dezincify in water service |
| Aluminum Brass | C68700 | Contains ~2% Aluminum, no Arsenic | No – Different corrosion mechanism |
| Naval Brass | C46400 | Higher Zinc (~38%), no Arsenic | No – For structural components, not tubing |
| Aluminum Bronze | C60800 / C61400 | Cu-Al-Fe alloy, no Zinc | No – Entirely different alloy family |
FAQ
1. What is C44300 equivalent to in British Standard?
C44300 Admiralty Brass is equivalent to BSI CZ111 under British Standard specifications. CZ111 shares identical chemical composition (Cu 70-73%, Sn 0.9-1.2%, As 0.02-0.06%) and is fully interchangeable with C44300 for condenser tube applications.
2. What is the ISO equivalent of C44300 Admiralty Brass?
The ISO equivalent of C44300 Admiralty Brass is CuZn28Sn1. This compositional designation indicates approximately 71% Copper, 28% Zinc, and 1% Tin. The Arsenic inhibitor requirement is included in the full ISO specification.
3. What is the European EN equivalent of C44300?
The European EN equivalent of C44300 Admiralty Brass is CuZn28Sn1As. The "As" suffix explicitly identifies the Arsenic addition that distinguishes inhibited Admiralty Brass from uninhibited grades.
4. C44300 vs CZ111: Are they the same?
Yes, C44300 and CZ111 are the same material. C44300 is the UNS (North American) designation, while CZ111 is the British Standard (BSI) designation. Both require identical chemical composition, mechanical properties, and are manufactured to ASTM B111 or equivalent specifications.
5. What is the JIS equivalent of C44300?
The JIS equivalent of C44300 Admiralty Brass is JIS C4430. Note the difference in numbering: UNS uses five digits (C44300), while JIS uses four digits (C4430). The material requirements are functionally identical.
6. Is C44300 equivalent to C46400 Naval Brass?
No, C44300 Admiralty Brass is NOT equivalent to C46400 Naval Brass. C44300 contains ~71% Cu, 28% Zn, and an Arsenic inhibitor for dezincification resistance. C46400 contains ~60% Cu, 38% Zn, and no Arsenic inhibitor. C46400 is for structural components, not heat exchanger tubing.
7. C44300 vs CuZn28Sn1: What is the difference?
There is no material difference. C44300 is the UNS designation, while CuZn28Sn1 is the ISO compositional designation for the same Admiralty Brass alloy. Both refer to inhibited Cu-Zn-Sn alloy with Arsenic addition.
8. Does ASTM B111 cover C44300 equivalents?
Yes. ASTM B111 covers UNS C44300 seamless condenser tubes. Material certified to international equivalents (CZ111, CuZn28Sn1As, C4430) that meets ASTM B111 composition and mechanical requirements is generally acceptable under this specification.
9. Is uninhibited Admiralty Brass equivalent to C44300?
No. Uninhibited Admiralty Brass (C44100 or C44200) lacks the Arsenic inhibitor (0.02-0.06% As) required for C44300. Uninhibited grades will suffer dezincification in water service and are not acceptable as C44300 substitutes for condenser applications.
10. What is the ASME equivalent specification for C44300 material?
C44300 Admiralty Brass is covered under ASME SB111 for pressure vessel service. This is the ASME Boiler and Pressure Vessel Code equivalent of ASTM B111. ASME SB395 covers U-bend configurations.
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.
