Composition Of Brass

by xiaolong luo cnc machining shop

Purity measurement

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

Ordinary brass

It is an alloy of copper and zinc.

When the zinc content is less than 35%, zinc can dissolve in copper to form a single phase a, which is called single-phase brass. It has good plasticity and is suitable for cold and hot pressure processing.

When the zinc content is 36% ~ 46%, there are a single phase and β solid solution based on copper and zinc, which is called dual phase brass. The β phase reduces the plasticity of brass and increases the tensile strength. Thermal pressure brass machining.

If the mass fraction of zinc continues to increase, the tensile strength will decrease and it will have no use value.

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

For example, H68 means brass with 68% copper content and 32% zinc content. For casting brass, add "Z" before the code, such as ZH62,brass 360.

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

H90 and H80 belong to single-phase brass, golden yellow, so they are collectively called golden, called plating, decorations, medals, etc.

H68, H59 are duplex brass, which is widely used in electrical components, such as bolts, nuts, washers, springs, etc.

In general, single-phase brass for cold deformation processing and dual-phase brass for hot deformation processing.

Special brass

A multicomponent alloy composed of other alloy elements added to ordinary brass is called brass. The elements often added are lead, tin, aluminum, etc., which can be called lead brass, tin brass, and aluminum brass accordingly. The purpose of adding alloy elements. It is mainly to improve the tensile strength and improve the processability.

Code: "H + main plus element symbol (except zinc) + copper mass fraction + main plus element mass fraction + other element mass fraction" means.

For example: HPb59-1 means that the mass fraction of copper is 59%, the mass fraction of lead with main plus element is 1%, and the balance is zinc-lead brass and brass 353.