CuZn30, which is also called cartridge brass, is an alloy used commonly in the production of large-calibre round cartridge cases. They are usually produced via cupping of a disc and consecutive deep drawing steps to decrease the wall thickness, with an annealing process in between each step to restore formability. In this study the manufacturing of cartridge brass (CuZn30) tubes is conducted through the flow forming process. In order to evaluate the flow forming behaviour, the preforms are manufactured by machining the CuZn30 billets, then the flow forming processes is applied. Thereafter, different temperature ranges (350, 450, and 550ºC for 1 h) are applied to flow formed samples in order to determine the proper recrystallization annealing temperature. The obtained microstructures and the mechanical properties are studied and revealed that the flow forming process is successfully realized, and the microstructure of the material is mapped with respect to the subsequent heat treatment temperature for recrystallization. Spherical and new grains are precisely generated after recrystallization annealing at 450 and 550ºC, but only partial recrystallization is obtained at 350ºC.