UNS C44300 Admiralty Brass Tube PDF
Admiralty Brass (C44300) vs. Naval Brass (C46400)
Admiralty Brass (UNS C44300) and Naval Brass (UNS C46400) are two widely used copper alloys in marine and industrial applications. Both alloys belong to the brass family (copper-zinc alloys) and contain tin for improved corrosion resistance. However, their chemical compositions, mechanical properties, and primary applications differ significantly due to distinct metallurgical designs.
Chemical Composition and Key Features
Admiralty Brass (C44300):
Composition: Nominally 71% Cu, 28% Zn, 1% Sn, with a critical addition of 0.02–0.10% arsenic (As) or similar inhibitor (e.g., Sb, P).
Key Feature: The arsenic addition serves as a dezincification inhibitor. This alloy is specifically designed to resist selective leaching of zinc in stagnant or slow-moving seawater and steam condensate.
Structure: Single alpha (α) phase structure, providing good ductility and cold workability.
Naval Brass (C46400):
Composition: Nominally 60% Cu, 39% Zn, 1% Sn. It does not contain intentional arsenic or other dezincification inhibitors.
Key Feature: Higher zinc content gives it a two-phase alpha-beta (α-β) structure, resulting in higher strength and better hot workability compared to single-phase brasses.
Focus: Optimized for mechanical strength and general corrosion resistance in marine environments.
| Parameter | Admiralty Brass (C44300) | Naval Brass (C46400) |
|---|---|---|
| Copper (Cu) | ~71% | ~60% |
| Zinc (Zn) | ~28% | ~39% |
| Tin (Sn) | ~1% | ~1% |
| Inhibitor | Arsenic (As), critical | None intentional |
| Phase Structure | Alpha (α) | Alpha-Beta (α-β) |
| Tensile Strength | ~380 MPa (55 ksi) | ~450 MPa (65 ksi) |
| Machinability | Fair (20% of free-cutting brass) | Good (30% of free-cutting brass) |
Typical Applications
Admiralty Brass (C44300):
Primary Use: Heat exchanger and condenser tubes in marine, power generation (especially coastal plants), petrochemical, and desalination industries.
Examples: Surface condensers, evaporator and distiller tubes, oil cooler tubes.
Naval Brass (C46400):
Primary Use: Marine hardware and structural components requiring strength and corrosion resistance.
Examples: Propeller shafts, pump shafts, valve stems, nuts, bolts, marine fittings, bushings, and architectural trim in marine environments.
Selection Guidelines
Choose Admiralty Brass (C44300) when:
The application involves thin-walled tubing for heat exchange.
The service environment includes stagnant, slow-moving, or brackish water (high risk of dezincification).
Corrosion resistance is the primary design criterion over tensile strength.
Choose Naval Brass (C46400) when:
The component is a load-bearing part (shaft, fitting, fastener) subject to mechanical stress.
The environment is freely flowing, clean seawater.
Good machinability or hot workability (forging) is required.
Our spot inventory
C44300 copper tube | C44300 heat exchanger tube | C44300 tube for seawater |
C46400 brass tube | Seamless C46400 brass tube | C46400 tube price |
Admiralty brass tube C44300 | C46400 brass pipe supplier | Copper alloy 443 tube |
ASTM B111 C44300 tube | ASTM B171 C44300 tube | C44300 copper alloy tube |
C44300 condenser tube | Marine brass tube C44300 | C46400 copper pipe |
Founded in 2008, we are a leading professional exporter specializing in a comprehensive range of high-quality copper products for global markets. Our core product portfolio encompasses various forms and specifications to meet diverse industrial needs.
Copper Tubes & Pipes:
We supply both Copper Seamless Tubes (ASTM B68, B75) and Copper Welded Tubes, including Pure Copper Tubes (C11000, C12200), Brass Tubes (C23000, C26000, C28000), and specialized Admiralty Brass Tubes (C44300) for superior corrosion resistance in heat exchanger applications. Our offerings comply with key ASTM standards such as ASTM B88 for seamless water tube and ASTM B111 for condenser tubes.
Copper Sheets & Plates:
Our range covers from thin-gauge Thin Copper Sheet (ASTM B152) to heavy-duty Thick Copper Plate, available in alloys like Pure Copper (C11000), Brass Sheet (C26000), Phosphor Bronze Sheet (C51000, C52100), and corrosion-resistant Admiralty Brass Sheet/Plate (C44300).
Copper Rods & Bars:
We provide Copper Round Rod, Copper Square Bar, Copper Hexagon Bar, and Copper Flat Bar in various tempers. Products include Free-Cutting Brass Rod (C36000 per ASTM B16), Oxygen-Free Copper Rod (C10100/C10200, ASTM B187), Beryllium Copper Bar (C17200, ASTM B196), and Admiralty Brass Rod (C44300).
Copper Wires & Strips:
Our Copper Wire products include Bare Copper Wire (ASTM B1/B2/B3), Enamelled Copper Wire, and Brass Wire. We also supply precision Copper Strip (C11000, C26800), Brass Strip, and Admiralty Brass Strip (C44300) for electrical, marine, and fabrication applications.
