65Cu and 70Cu refer to the copper content in brass, representing brass with 65% and 70% copper, respectively. These two types of brass differ in composition and properties, leading to different areas of application.

65Cu (65% copper, 35% zinc), commonly referred to as brass, has the following characteristics and uses:

Corrosion Resistance: It has good corrosion resistance, making it suitable for various environments.

Mechanical Properties: It offers adequate tensile strength and ductility, along with excellent tensile and bending strength.

Electrical and Thermal Conductivity: Although not as good as pure copper, it still possesses certain levels of electrical and thermal conductivity.

Aesthetic Appeal: With a golden yellow color, it is often used in architectural decoration, furniture fittings, and lighting fixtures.

Screening and Filtration: It is used for screening various particles, powders, and ceramics, as well as filtering liquids and gases.

70Cu (70% copper, 30% zinc), commonly referred to as high-quality brass, features the following characteristics and uses:

Higher Wear Resistance: With a lower zinc content, it has greater wear resistance and tensile strength.

Stronger Hardness: Compared to 65Cu, 70Cu has greater hardness, making it suitable for applications requiring higher structural strength.

Aesthetic Appeal: It also has a golden yellow appearance, suitable for decorative applications, especially for custom products.

Special Applications: It is used in specific situations, such as marine applications, high-end paneling, room dividers, and unique artistic designs.

In summary, 65Cu brass is more commonly found in industrial applications due to its good overall performance and cost-effectiveness. In contrast, 70Cu brass is preferred in specific applications where higher hardness and wear resistance are required.