SYNCHRONIZER RING AND ITS PRODUCTION

PROBLEM TO BE SOLVED: To obtain a ring excellent in wear resistance and fatigue resistance and excellent in hardness characteristics by specifying the apparent Zn content and Sn content. SOLUTION: When the apparent content of Zn: (B+t.Q)/(A+B+t.Q)}×100, A: the content (wt.%) of Cu, B: the content (wt.%) of Zn, (t): the Zn equivalent of Sn and Q: the content (wt.%) of Sn are denoted, the apparent Zn content is 37 to 50 wt.%, and the Sn content is 0.5 to 7 wt.%. The crystal structure of the stock is at least one among that in which at least a γ phase is contained, and the area ratio thereof is 1 to 50%, or that in which a β phase and a γphase are contained, the area ratio of the β phase is 25 to 45%, and that of the γ phase is 25 to 45%, or that in which the area ratio of an α phase is 30 to 75%, that of the βphase is 0 to 55% and that of the γ phase is 1 to 50% or that the average crystal grain size of the minor axis of the γ phase is