CuZn19Sn is a classic tin brass (Tin Brass) alloy, part of the copper-zinc-tin ternary system. It combines good mechanical properties, excellent corrosion resistance, and a degree of wear resistance, making it particularly suitable for applications that require seawater corrosion resistance and mechanical wear resistance.

1. Standards and Nomenclature

• Material Name: CuZn19Sn

• Standard Grade: DIN 2.0882

• EN Code: CW720R

• UNS Code: C44500 (close equivalent)

• Alloy Type: Tin Brass

• Applicable Standards: EN 12163 / EN 12164 / DIN 17660 / ISO Standards, etc.

2.Chemical Composition

• Cu (Copper)：79 – 82%

• Zn (Zinc)：Balance%

• Sn (Tin)：0.8 – 1.5%

• Pb (Lead)：≤ 0.20%

• Fe (Iron)：≤ 0.10%

• Impurities Total：≤ 0.2%

• The addition of tin (Sn) enhances corrosion resistance, strength, and wear resistance, particularly excelling in marine and humid environments.

3.Mechanical Properties (for Half-Hard Temper)

• Tensile Strength (Rm)：380–520 MPa

• Yield Strength (Rp0.2)：150–300 MPa

• Elongation (A50)：≥ 10%

• Brinell Hardness (HB)：90–130 HB

• Density：8.5 g/cm³

• Thermal Conductivity：~90 W/m·K

4. Material Performance Features

（1）Main Advantages:

• Excellent Corrosion Resistance: Especially suitable for seawater, salt fog, and humid environments.

• Good Strength and Ductility: Suitable for both cold working and hot forging.

• Moderate Wear Resistance: Ideal for light to medium load sliding friction applications.

• Good Formability: Easy to stamp, bend, and forge.

• Weldability: Suitable for brazing; for arc welding, attention should be paid to oxidation in the heat-affected zone.

（2）Limitations:

• Moderate to low machinability compared to leaded brass (e.g., CuZn39Pb3).

• Not recommended for use in highly acidic or ammonia-containing environments (may lead to dezincification).

5. Typical Application Areas

Due to its excellent comprehensive properties, CuZn19Sn is widely used in the following industrial fields:

• Shipbuilding Industry: Flanges, joints, seawater pump parts, anti-corrosion components.

• Hydraulic and Water Systems: Valve seats, sealing housings, pipe fittings.

• Mechanical Engineering: Sliding bearings, guide bushes, wear-resistant inserts.

• Building and Decoration: Corrosion-resistant copper pipes, decorative panels, connectors.

• Electrical Engineering: Grounding components, electrical terminals (where conductivity is important).

6. Available Forms

CuZn19Sn alloy is available in the following forms through hot rolling, cold drawing, and forging processes:

• Solid Round Bars

• Sheets/Plates

• Profiles and Custom Shapes

• Precision Machined Custom Parts (Made to Drawing)

7. Comparison of CuZn19Sn with Other Brass Alloys

（1）CuZn19Sn

• Primary Alloying Element：Small amount of Tin

• Strength：Medium

• Corrosion Resistance：Excellent (Seawater)

• Machinability：Fair

• Application Features：Corrosion-resistant + Sliding parts

（2）CuZn39Pb3

• Primary Alloying Element：Lead

• Strength：High

• Corrosion Resistance：Fair

• Machinability：Excellent

• Application Features：Easy to machine, e.g., valves, fittings

（3）CuZn37

• Primary Alloying Element：Binary Brass

• Strength：Medium

• Corrosion Resistance：Fair

• Machinability：Medium

• Application Features：Stamped parts, decorative items

（4）CuZn21Si3P

• Primary Alloying Element：Silicon Brass

• Strength：High

• Corrosion Resistance：Excellent

• Machinability：Fair

• Application Features：High-strength, corrosion-resistant, lead replacement

8. Conclusion

CuZn19Sn is a tin brass alloy that balances strength, corrosion resistance, and formability, making it particularly suitable for engineering applications that require both mechanical load-bearing and exposure to corrosive environments. Compared to traditional binary brasses, it offers significant advantages in reliability and service life, especially in marine engineering and fluid control systems.

If you are looking for high-performance naval brass or copper alloy materials, we offer CuZn19Sn (CW701R) in various forms such as bars, sheets, wires, pipes, and custom sizes, with services for precision machining, heat treatment, and surface treatment.

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