UNS C44300 Admiralty Brass Tube PDF
What is C44300 /C46400?
Admiralty Brass (C44300) and Naval Brass (C46400) represent two specialized adaptations within the copper alloy family, each engineered to address distinct challenges in marine and industrial environments. While both alloys share the "naval" designation and demonstrate strong seawater compatibility, their fundamental metallurgical designs diverge to serve separate purposes: C44300 as a corrosion-resistant heat transfer medium, and C46400 as a structural marine component material. This divergence manifests across chemical composition, mechanical behavior, and application-specific performance.
Chemical Composition Comparison
| Element | Admiralty Brass (C44300) | Naval Brass (C46400) |
|---|---|---|
| Copper (Cu) | 70.0 - 73.0% | 59.0 - 62.0% |
| Zinc (Zn) | 26.0 - 29.5% | 36.5 - 39.5% |
| Tin (Sn) | 0.9 - 1.2% | 0.5 - 1.0% |
| Arsenic (As) | 0.02 - 0.10% | ≤ 0.02% |
| Lead (Pb) | ≤ 0.07% | ≤ 0.20% |
| Iron (Fe) | ≤ 0.06% | ≤ 0.10% |
Key Compositional Notes:
C44300 contains intentional arsenic addition as a dezincification inhibitor
C46400 has higher zinc content, resulting in a stronger alpha-beta structure
Both contain ~1% tin for corrosion resistance enhancement
Physical Properties Comparison
| Property | Admiralty Brass (C44300) | Naval Brass (C46400) |
|---|---|---|
| Density (g/cm³) | 8.53 | 8.41 |
| Melting Range (°C) | 900 - 940 | 885 - 900 |
| Electrical Conductivity (% IACS) | 26% | 26% |
| Thermal Conductivity (W/m·K at 20°C) | 111 | 116 |
| Coefficient of Thermal Expansion (μm/m·K, 20-300°C) | 20.2 | 20.5 |
Physical Properties Analysis:
Both alloys have similar electrical conductivity
C46400 has slightly better thermal conductivity
C44300's higher copper content gives it slightly higher density
Mechanical Properties Comparison
| Property | Condition | Admiralty Brass (C44300) | Naval Brass (C46400) |
|---|---|---|---|
| Tensile Strength (MPa) | Annealed | 325 - 380 | 380 - 450 |
| Hard | Up to 420 | Up to 520 | |
| Yield Strength (MPa) | Annealed | 125 | 140 |
| Hard | 310 | 345 | |
| Elongation (% in 50mm) | Annealed | 55 | 40 |
| Hard | 15 | 20 | |
| Hardness (Brinell) | Annealed | 80 HB | 95 HB |
| Hard | 155 HB | 170 HB |
Mechanical Performance Summary:
C46400 demonstrates superior strength and hardness in all conditions
C44300 maintains better ductility (higher elongation)
The strength difference stems from C46400's alpha-beta phase structure
Selection Guidelines
Choose Admiralty Brass (C44300) when:
The application involves heat exchanger or condenser tubes
Service environment includes stagnant, brackish, or polluted water
Dezincification resistance is the primary concern
Application requires good cold formability into thin-walled sections
Choose Naval Brass (C46400) when:
The component is a load-bearing marine part (shafts, propellers, valves)
The environment is freely flowing, clean seawater
High strength and toughness are required
Hot forging or machining is part of the manufacturing process
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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.
