What is the difference between model 63 copper and 64 copper?

Differences in chemical composition

63 Copper (HPb63-3): is leaded brass, the main chemical composition is copper (Cu) content of about 62.0 - 65.0 per cent, lead (Pb) content of about 2.4 - 3.0 per cent, zinc (Zn) remainder. The main reason for the inclusion of Pb is to improve the cutting properties of the brass and make it easier to shape during machining.

64 Copper (HPb64-2): Also a leaded brass with a copper (Cu) content of approximately 63.0 - 66.0%, lead (Pb) content of approximately 1.5 - 2.0% and a balance of zinc (Zn). Compared to 63 copper, 64 copper has a lower lead content and a slightly higher copper content.

Mechanical properties differ

Strength

63 Copper: Due to its compositional characteristics, it has good strength and can be used in some situations where it is required to withstand a certain amount of pressure or tension. For example, in the production of some small mechanical parts, such as bolts, nuts, etc., can provide sufficient strength to ensure the normal use of parts.

64 Copper: Slightly stronger than 63 copper, which gives it an advantage in applications that require higher strength. For example, in the manufacture of tubes or rods that require higher strength, 64 Copper is better able to fulfil the requirements.

Hardness

63 Copper: Moderately hard, with a Brinell hardness (HB) of around 85 - 100 (for forgings), which makes it easy to machine and somewhat resistant to wear.

64 copper: the hardness is slightly higher than 63 copper, for example 64 copper rods may have a hardness of HB105 - 120, which makes it potentially superior in terms of wear resistance, and is suitable for applications where relatively high wear resistance is required.

Differences in elongation

63 Copper: has a good elongation, which means that it is capable of large deformations without breaking when subjected to tensile forces. 63 Copper is better suited to processes that require stamping or stretching, such as making thin-walled containers or complex shapes of stamped parts.

64 Copper: Slightly lower elongation than 63 Copper because of its relatively high strength and hardness, and slightly less deformability.

Differences in application areas

63 Copper:

Commonly used in the production of clock and watch parts, automobiles, tractors and general machine parts such as bushings and small shafts. Due to its good cutting properties and moderate mechanical properties, it can meet the accuracy requirements in the manufacture of these precision parts and can be machined to obtain complex shapes.

It is also used in the manufacture of musical instrument parts, such as the keys of musical instruments. Its good machining performance can ensure the dimensional accuracy and surface quality of the keys and other parts, while its tone conductivity and other properties can also meet the requirements of musical instruments.

64 Copper:

More suitable for the manufacture of various pins, nuts, washers, conduits and so on. Because of its high strength and hardness can ensure the stability and reliability of these parts in the process of use, reducing the possibility of deformation and damage.

In environments that require high corrosion and wear resistance, such as small parts of chemical equipment or mechanical structures in a friction environment, 64 copper also has an advantage over 63 copper.