The Composition of Brass

Purity measurement

The purity of brass can be measured by the Archimedes principle, first measure the volume and mass of the sample. Based on the density of the copper and the density of the zinc, the proportion of copper contained in the brass can be calculated.


Ordinary brass

Ordinary brass is an alloy composed of copper and zinc. When the zinc content is less than 35%,  it can be dissolved in copper to form a single phase a, called single phase brass. Single-phase brass has good plasticity and is suitable for cold and hot press processing.


When the zinc content is 36%~46%, there is a single phase and a copper-zinc-based β solid solution, which is called duplex brass. The β phase reduces the plasticity of the brass and increases the tensile strength. Hot pressure processing.


If the mass fraction of zinc is continuously increased, the tensile strength is lowered and there is no use value.


The code name is represented by "H + number", H is brass, and the number indicates the mass fraction of copper.


For example, H68 means copper with a copper content of 68% and a zinc content of 32%. For cast brass, the word "Z" is added before the code name, such as ZH62.


For example, Zcuzn38 represents a cast brass with a zinc content of 38% and a balance of copper.

H90 and H80 are single-phase brass, golden yellow, used for plating, decorations, medals, etc.

H68 and H59 are duplex brass and are widely used in structural parts such as bolts, nuts, washers, springs, etc.


In general, duplex stainless steel for cold deformation processing uses duplex brass for hot deformation processing.


Special brass

A multi-component alloy consisting of other alloying elements added to ordinary brass is called brass. Commonly added elements are lead, tin, aluminum, etc., which may be referred to as lead brass, tin brass, aluminum brass. The purpose of adding alloying elements. Mainly to improve the tensile strength to improve the process.