UNS C44300 Admiralty Brass Tube PDF
What is sB111 C44300 copper?
sB111 C44300 copper alloy is an arsenic-inhibited copper-zinc-tin alloy, commonly known as arsenic-inhibited naval metal or naval brass. It combines strength and ductility with good corrosion resistance. The addition of a small amount of arsenic (nominal content 0.06%) is to minimize the alloy's susceptibility to dezincification and stress corrosion. It is widely used in condenser, evaporator, and heat exchanger tubing and related applications.
Chemical Breakdown
The standard chemical composition for Admiralty Brass C44300 per ASTM B111:
| Element | Composition (%) | Role in the Alloy |
| Copper (Cu) | 70.0 – 73.0 | The alloy's foundation providing excellent thermal conductivity. |
| Tin (Sn) | 0.9 – 1.2 | The primary inhibitor preventing dezincification. |
| Arsenic (As) | 0.02 – 0.06 | A secondary inhibitor for added stability. |
| Lead (Pb) | Max 0.07 | An impurity limited to ensure material integrity. |
| Iron (Fe) | Max 0.06 | An impurity controlled for high corrosion resistance. |
| Zinc (Zn) | Balance | Provides mechanical strength and hardness. |
The Role of Inhibitors
Tin and arsenic are what make Admiralty Brass unique.
Tin (Sn):
In corrosive water tin forms a durable non-porous and self-healing film of stannic oxide on the surface. This barrier prevents the electrolyte from leaching zinc from the alloy matrix.
Arsenic (As):
As a secondary inhibitor arsenic provides an extra layer of protection ensuring long-term stability.
Physical Properties
| Properties * | English | Metric |
|---|---|---|
| Melting Point | 1650 ~ 1720 °F | 899 ~ 938 °C |
| Tensile Strength, min. | 45 ksi | 310 MPa |
| Density | 0.308 lb/in³ | 8.53 g/cc |
| Yield Strength, min. | 15 ksi | 105 MPa |
| Specific Heat Capacity | 0.09 BTU/lb-°F @ 70ºF | 0.09 cal/g-°C @ 20ºC |
| CTE, linear | 11.2 10-6/°F @ 70.0 – 570 °F | 20.2 10-6/°C @ 20.0 – 300 °C |
| Thermal Conductivity | 64 BTU/ft2/ft/h/°F @ 70.0 °F | 109 W/m-K @ 20.0 °C |
Mechanical Properties
| Standard | ASTM B 111 | BS 2871 PART3 | DIN 1785 | JIS H3300 | NFA 51 102 | IS 1545 |
|---|---|---|---|---|---|---|
| Symbol | C 44300 | CZ 111 | CuZn28Sn1 | C 4430 | CuZn29Sn1 | CuZn29Sn1As |
| Sn | 0.9-1.2 | 1.0-1.5 | 0.9-1.3 | 0.9-1.2 | 0.9-1.2 | 1.0-1.5 |
| Cu | 70.0-73.0 | 70.0-73.0 | 70.0-72.5 | 70.0-73.0 | 70.0-73.0 | 70.0-73.0 |
| Pb | 0.07 | 0.07 | 0.07 | 0.07 | 0.07 | 0.07 |
| As | 0.02-0.06 | 0.02-0.06 | 0.02-0.035 | 0.02-0.06 | 0.02-0.06 | 0.02-0.06 |
| Fe | 0.06 | 0.06 | 0.07 | 0.06 | 0.06 | 0.06 |
| Ni | – | – | 0.1 | – | – | – |
| Zn | REM'DER | REM'DER | REM'DER | REM'DER | REM'DER | REM'DER |
| P | – | – | 0.01 | – | – | – |
| Total Impurities Max. | – | |||||
| – | 0.03 | 0.1 | – | 0.3 | 0.3 | |
| Elng'Tion Percent (%) Minimum | – | – | 45Min. | -. | – | – |
| – | – | 55Min. | 30 Min. | – | – | |
| Condition | 61 | M | F36 | – | – | O |
| – | TA | F32 | O | – | TA | |
| – | O | – | – | – | D | |
| Tensile N/MM2 Minimum | 310 | – | 360 | – | – | 375 Mpa Max. |
| – | – | 320 | 314Min. | – | 340 Mpa Min. | |
| – | – | – | – | – | 385 Mpa Min. | |
| Yield Strength N/MM2 | – | – | 140-220 | – | – | – |
| 105 | – | 100-170 | – | – | – | |
| Grain Size mm (75X) | 0.010-0.045 | 0.05Max. | – | 0.010-0.045 | 0.010-0.045 | 0.010-0.04 |
| Hardness HV5 – | – | 150Min | – | – | – | 80 Max. |
| – | 85-105 | – | – | 80-120 | 80-105 | |
| – | 75Max. | – | – | – | 130 Min. |
Feature
1) Light Weight
2) Good Thermal Conductivity
3) High stability
4) High Strength
5) Good fatigue
6) Rust and corrosion resistance properties
7) Good deep-drawing performance
Application
1)Condensers
2)Radiators
3)Chemical equipment
4)Sanitation
5)Heat exchange shells
6)Distiller tubes
7)Aerospace industry
Our spot inventory
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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.
