Patent ID: 6942742

Claim:
A copper-based alloy excellent in dezincing resistance consisting essentially of, in percentage by weight: Cu: 57-69%, Sn: 0.3-3% Si: 0.02-1.5%, Bi: 0.5-3%, and Pb: not more than 0.2% (including 0%), P: 0.02-0.2%. and the balance: Zn and unavoidable impurities, further containing, in percentage by weight, where the ratio of Si/Sn expressed in weight percentage is in the range of 0.05-and apparent zinc content as defined by Formula (1) below is in the range of more than 39-50 wt. %, Apparent Zn content=[(Zn % +2.0 ×Sn % +10.0 ×Si %)/(Cu % +Zn % +2.0 ×Sn % +10.0 ×Si %)]×100 (1).