1)Ordinary brass
It is composed of copper and zinc alloy. When the zinc content is less than 39%, zinc can dissolve in copper to form a single phase a, called single-phase brass, good plasticity, suitable for hot and cold pressurized processing. When the zinc content is greater than 39%, there is a single-phase copper-zinc-based b solid solution, called dual-phase brass, b so that the plasticity of the small tensile strength rise, only suitable for hot pressure processing.
Codename with "H + number", H indicates brass, the number indicates the mass fraction of copper. Such as H68 copper content of 68%, zinc content of 32% of the brass; casting brass in the code before the word "Z", such as ZH62.
H90, H80 single-phase, golden yellow, so there is a total of gold, known as plating, decorations, medals, etc. H68, H59 belongs to the two-phase brass, widely used in electrical appliances on the structure of the parts, such as bolts, nuts, washers, springs and so on.
In general, cold deformation processing with single-phase brass, hot deformation processing with two-phase brass.
2)Special brass
In the ordinary brass by adding other alloying elements composed of multiple alloys known as brass. Frequently added elements are lead, tin, aluminum, etc., accordingly can be called lead brass, tin brass, aluminum brass. The purpose of adding alloying elements. Mainly to improve the tensile strength to improve the processability.
Code: for the "H + main plus element symbol (except zinc) + copper mass fraction + main plus element mass fraction + other elements mass fraction" said.
Such as: HPb59-1 indicates that the mass fraction of copper is 59%, containing the main addition of the mass fraction of lead for 1%, the balance of zinc lead brass.
