UNS C44300 Admiralty Brass Tube PDF
C44300 Brass vs. C46400 Brass
C44300 (Admiralty Brass): Cu-Zn-Sn alloy. It is essentially a 70/30 brass (70% Cu, 29% Zn, 1% Sn) with a small addition of Arsenic (As) or sometimes Antimony/Sb or Phosphorus/P.
C46400 (Naval Brass): Cu-Zn-Sn alloy. It is commonly known as 60/40 brass (60% Cu, 39.2% Zn, 0.8% Sn).
Defining Characteristic & Purpose of Tin (Sn)
C44300: The 1% Tin is added primarily to improve corrosion resistance, specifically resistance to dezincification and impingement attack in saltwater and steam condensate.
C46400: The ~1% Tin is added primarily to increase strength and hardness compared to ordinary brasses, while also offering good corrosion resistance.
C44300 vs. C46400
C44300: The Arsenic (As) addition (~0.02-0.10%) is critical. It acts as an inhibitor to prevent dezincification, a form of selective leaching where zinc corrodes away, leaving a porous copper structure.
C46400: It does not contain Arsenic. Its resistance to dezincification in seawater is good but generally inferior to inhibited brasses like C44300.
Mechanical Properties
C44300: Good strength and ductility, but its mechanical properties are secondary to its corrosion/erosion resistance.
C46400: Has higher tensile strength, yield strength, and hardness than C44300. It is a stronger, more robust structural material.
Corrosion Resistance
C44300: Excellent and specialized. Superior resistance to dezincification, erosion-corrosion, and biofouling in flowing seawater, brackish water, and steam condensate. The arsenic inhibits the corrosion mechanism.
C46400: Very good general corrosion resistance in marine environments. Strong against saltwater corrosion, but more susceptible to dezincification than inhibited admiralty brass in stagnant or slow-moving water.
Primary Applications
C44300: Almost exclusively used for heat exchanger and condenser tubes, tube sheets, and other components in marine, power plant, and desalination plant systems where heat transfer and long-term corrosion resistance are paramount.
C46400: Used for a wide variety of marine hardware and structural components. Common applications include propeller shafts, pump shafts, valve stems, fasteners, bolts, nuts, marine fittings, and other high-strength parts in contact with seawater.
| Feature | Admiralty Brass (C44300) | Naval Brass (C46400) |
|---|---|---|
| Core Purpose | Corrosion/Dezincification Resistance | Strength & General Marine Durability |
| Key Additive | Arsenic (As) - for inhibition | Tin (Sn) - for strengthening |
| Optimal Use | Heat Transfer Surfaces (tubes) in corrosive waters | Structural Components (shafts, fittings, hardware) |
| Strength | Good | Higher |
| Dezincification Resistance | Excellent (Inhibited) | Good |
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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.
