UNS C44300 Admiralty Brass Tube PDF
C44300/C70600 Quick-Reference Comparison Table
| Feature | SB111 C44300 (Admiralty Brass) | SB111 C70600 (90-10 Cupronickel) |
|---|---|---|
| Common Name | Admiralty Brass, Arsenical Admiralty | 90-10 Cupronickel, Cunifer 10® |
| Alloy Family | Inhibited Tin Brass (Cu-Zn-Sn + As) | Cupronickel (Cu-Ni-Fe) |
| Typical Composition | Cu: 70-73% Zn: 28-29% Sn: 0.9-1.2% As (Arsenic): 0.02-0.10% (Inhibitor) |
Cu: 86.5% min Ni: 9.0-11.0% Fe: 1.0-1.8% Mn: 0.3-1.0% Zn: 1.0% max (impurity) |
| Key Metallurgical Additive | Arsenic (As) – Critical for inhibiting dezincification. | Nickel (Ni) + Iron (Fe) – Ni provides solid solution strengthening and fundamental corrosion resistance; Fe enhances resistance to impingement/erosion corrosion. |
| Primary Corrosion Resistance Mechanism | Formation of a protective, adherent film. Arsenic inhibits the selective leaching of zinc (dezincification). | Formation of a tough, complex, and highly adherent protective surface layer primarily of cuprous oxide (Cu₂O), stabilized and strengthened by nickel and iron oxides. This layer is self-healing. |
| Strength & Mechanical Properties | Lower Strength. Typical Tensile: ~330 MPa (48 ksi) Typical Yield: ~130 MPa (19 ksi) More ductile, softer. |
Higher Strength. Typical Tensile: ~290-380 MPa (42-55 ksi) Typical Yield: ~125-200 MPa (18-29 ksi) Stronger, more resistant to creep and sag. |
| Thermal Conductivity | ~109 W/m·K (High) – Advantage for heat transfer efficiency. | ~50 W/m·K (Moderate) – About half that of Admiralty. Requires more surface area for equivalent heat transfer. |
| Maximum Allowable Water Velocity | ~2.1 m/s (7 ft/s) – Susceptible to erosion-corrosion at higher velocities. | ~3.6-4.6 m/s (12-15 ft/s) – Superior resistance to impingement attack due to the tough protective layer. |
| Resistance to Specific Threats | Poor: Sulfide pollution, ammonia, high-velocity/suspended solids. Good: Clean, flowing seawater. |
Excellent: High-velocity water, sand/silt erosion, sulfide pollution (significantly better than brass). Good: Ammoniacal environments (better than brass). |
| Biofouling Resistance | Moderate. Copper ions provide some biocidal effect, but biofilm can still form. | Superior. The corrosion product layer is less hospitable to marine organisms. Nickel content also deters biofouling. |
| Galvanic Position | More anodic (active) relative to Cupronickel. Will corrode preferentially if coupled. | More cathodic (noble) relative to Admiralty Brass. |
| Cost (Material) | Lower. Contains cheaper zinc as the main alloying element. | Higher. Contains expensive nickel (~20-30% price premium over Admiralty, depending on Ni market). |
| Typical Applications | - Power plant condensers with clean, low-velocity cooling water (fresh, brackish, or clean seawater). - Low-cost option for less demanding service. |
- Standard for modern seawater cooling systems: shipboard condensers, offshore platform heat exchangers, desalination plants. - Systems with high water velocity, sandy water, or variable water quality. |
When to Use Which?
Choose SB111 C44300 (Admiralty Brass) when:
The cooling water is clean, low-velocity (<2.1 m/s), and sulfide-free (e.g., many freshwater-cooled power plants, some clean estuary sources).
Initial cost is the primary driver and water conditions are historically proven to be benign.
It's a replacement in an existing system that was originally designed for Admiralty.
Choose SB111 C70600 (90-10 Cupronickel) when:
The cooling medium is full seawater or brackish water.
High water velocity is required or possible.
The water contains suspended solids (sand, silt) or is subject to sulfide pollution.
Low biofouling and maximum long-term reliability are critical (e.g., naval vessels, offshore platforms, desalination plants).
Life-cycle cost (not just initial cost) is considered-its longer service life often justifies the higher upfront price.
C44300 is the cost-effective specialist for clean, low-stress service. C70600 is the robust, all-round champion for demanding seawater applications, where its premium price buys significant performance and reliability advantages. The SB111 specification ensures both meet stringent quality and dimensional standards for pressure tubing.
Our spot inventory
|
C70600 copper tube |
C70600 heat exchanger tube |
C44300 tube for seawater |
|
C44300 brass tube |
Seamless C44300 brass tube |
C70600 tube price |
|
Admiralty brass tube C44300 |
C44300 brass pipe supplier |
Copper alloy 443 tube |
|
ASTM B111 C70600 tube |
ASTM B171 C44300 tube |
C70600 copper alloy tube |
|
C70600 condenser tube |
Marine brass tube C44300 |
C44300 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.
