| 摘要 |
<p>An object is to improve machinability and polishability of a brass material prepared through cold working, particularly in a brass pipe material. Before cold working, by having an alpha phase making heat treatment step for increasing an area ratio of an alpha phase, cold ductility can be ensured at the time of cold working. Also, after cold working, by having a beta phase making heat treatment step for increasing an area ratio of a beta phase, a brass material excellent in machinability and polishability can be provided. <IMAGE> <IMAGE> <IMAGE></p> |
