Copper-based alloy excellent in dezincing resistance

Details Copper-based alloy excellent in dezincing resistance Copper-based alloy excellent in dezincing resistance

2005-09-13

2005-09-13

Ip, Sikyin (Department: 1742)

Metal treatment

Stock

Copper base

C420S476000

Reexamination Certificate

active

06942742

ABSTRACT:
A copper-based alloy excellent in dezincing resistance comprises, 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%, where the ratio of Si/Sn expressed in weight percentage is in the range of 0.05-1 and apparent zinc content as defined by the following formula is in the range of more than 39-50 wt. %, and the balance of unavoidable impurities: Apparent Zn content=[(Zn %+2.0×Sn %+10.0×Si %)/(Cu %+Zn %+2.0×Sn %+10.0×Si %)]×100. Despite the fact that contains no added environment-unfriendly Pb, the alloy exhibits enhanced cuttability, together with excellent forgeability, dezincing resistance and hot forgeability.

REFERENCES:
patent: 54-135618 (1979-10-01), None
patent: 07310133 (1995-11-01), None
patent: 10-183275 (1998-07-01), None
patent: 2000-119774 (2000-04-01), None
patent: 2002-3967 (2002-01-01), None
patent: 2002-12927 (2002-01-01), None
(Above JP 07310133 is provided with machine translation).

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