Plain brass. It is an alloy of copper and zinc.

Ordinary brass classification: when the zinc content is less than 39%, zinc can dissolve in copper to form a single phase, called single phase brass, good plasticity, suitable for hot and cold compression processing. When the zinc content is greater than 39%, there is a single phase and copper and zinc based B solid solution, called dual-phase brass, B makes the plasticity small and tensile strength rise, only suitable for thermal pressure processing. If the mass fraction of zinc continues to increase, the tensile strength will decrease and it is useless.

Brass alloys containing less than 36% zinc are composed of solid solutions and have good cold working performance. For example, brass containing 30% zinc is commonly used to make shell casings, commonly known as shell brass or seventy-three brass. Brass alloys with zinc content between 36 and 42% are composed of and solid solutions, of which the most commonly used is hexagonal brass with zinc content of 40%.

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

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