Copper-zinc alloy

Abstract

A copper-zinc alloy for producing electrically conductive components, for example contacts, consisting of: 62.5-67% Cu by weight, 0.25-1.0% Sn by weight, 0.015-0.15% Si by weight, at least two silicide-forming elements from the group Mn, Fe, Ni and Al with in each case being at most 0.15% by weight wherein the sum of these elements does not exceed 0.6% by weight, at most 0.1% Pb by weight, the rest being formed by Zn and also unavoidable impurities.

1 - 13 . (canceled) 
     
     
         14 . Copper-zinc alloy for producing electrically conductive components consisting of:
 Cu: 62.5-67% by weight,   Sn: 0.25-1.0% by weight,   Si: 0.015-0.15% by weight,   at least two silicide-forming elements from the group Mn, Fe, Ni and Al, each at most 0.15% by weight, wherein the sum of these elements does not exceed 0.06% 0.6% by weight,   Pb: at most 0.1% by weight,   remainder Zn and also unavoidable impurities.   
     
     
         15 . Copper-zinc alloy of  claim 14 , with
 Cu: 64-66.5% by weight,   Sn: 0.3-0.7% by weight,   Si: 0.03-0.1% by weight.   
     
     
         16 . Copper-zinc alloy of  claim 15 , with
 Cu: 64.5-66% by weight,   Sn: 0.4-0.6% by weight,   Si: 0.03-0.08% by weight,   at least two silicide-forming elements from the group Mn, Fe, Ni and Al, each at most 0.1% by weight, wherein the sum of these elements does not exceed 0.4% by weight,   remainder Zn and also unavoidable impurities.   
     
     
         17 . Copper-zinc alloy of  claim 14 , wherein the alloy contains Zn with 32-36% by weight. 
     
     
         18 . Copper-zinc alloy of  claim 14 , wherein the silicide-forming elements in the alloy contain Fe, Ni and Al, and wherein the Ni portion and the Al portion are approximately equal, and the Fe portion is 40% to 60% of the Ni portion or of the Al portion. 
     
     
         19 . Copper-zinc alloy of  claim 18 , wherein each of the Ni content and the Al content is 0.04 to 0.1% by weight, and the Fe content is 0.02 to 0.05% by weight. 
     
     
         20 . Copper-zinc alloy of  claim 19 , wherein each of the Ni content and the Al content is 0.06 to 0.08% by weight, and the Fe content is 0.03 to 0.04% by weight. 
     
     
         21 . Copper-zinc alloy of  claim 14 , wherein the alloy is Cr-free. 
     
     
         22 . Copper-zinc alloy product produced from a copper-zinc alloy according to  claim 14 , wherein the microstructure matrix at room temperature has a strongly predominant α phase. 
     
     
         23 . Copper-zinc alloy product of  claim 22 , wherein the average grain size of the microstructure is between 10 and 100 μm. 
     
     
         24 . Copper-zinc alloy product of  claim 22 , wherein its electrical conductivity is at least 12 mS/m (20% IACS). 
     
     
         25 . Copper-zinc alloy product of  claim 22 , wherein the product is cold-formed from a semi-finished product by drawing, with a reduction in cross section of about 20%, and exhibits the following strength values:
 0.2% tensile yield strength: approx. 310 N/mm2,   tensile strength: approx. 390 N/mm2,   elongation at break: approx. 25%,   hardness: approx. 120 HB 2.5/62.5.   
     
     
         26 . Copper-zinc alloy product of  claim 22 , wherein the product is cold-formed from a semi-finished product by drawing, with a reduction in cross section of about 35%, and exhibits the following strength values:
 0.2% tensile yield strength: approx. 400 N/mm2,   tensile strength: approx. 450 N/mm2,   elongation at break: 12%,   hardness: 143 HB 2.5/62.5.