Lead-free CU-Zn alloy

Abstract

A lead-free Cu—Zn alloy with improved machining properties compared to the alloy CuZn42, consisting of: 57-59.3 wt % Cu; 0.12-0.17 wt % Fe as a first alternative, or up to 0.06 wt % Fe and 0.3-0.7 wt % Mn as a second alternative; 0.03-0.1 wt % P; up to 1.0 wt % Sn; up to 0.1 wt % Pb; balance Zn together with unavoidable impurities, which are permitted up to 0.05 wt % per element, wherein the sum total of unavoidable impurities does not exceed 0.15 wt %; and wherein the following elements are tolerated up to the following specified contents: up to 0.03 wt % Ni, up to 0.05 wt % Al, up to 0.01 wt % Si, up to 0.01 wt % Cr.

1 . A lead-free Cu—Zn alloy with improved machining properties compared to the alloy CuZn42, consisting of:
 Cu: 57-59.3 wt %; 
 Fe: 0.12-0.17 wt % as a first alternative, or 
 Fe: up to 0.06 wt % and Mn: 0.3-0.7 wt % as a second alternative; 
 P: 0.03-0.1 wt % 
 Sn: up to 1.0 wt %; 
 Pb: up to 0.1 wt %; 
 balance Zn together with unavoidable impurities, which are permitted up to 0.05 wt % per element, wherein the sum total of unavoidable impurities does not exceed 0.15 wt %; 
 wherein the following elements are tolerated up to the specified contents: 
 Ni: up to 0.03 wt %, 
 Al: up to 0.05 wt %, 
 Si: up to 0.01 wt %, 
 Cr: up to 0.01 wt %. 
 
     
     
         2 . The Cu—Zn alloy of  claim 1  according to the first alternative, wherein the Fe content is 0.13-0.15 wt %. 
     
     
         3 . The Cu—Zn alloy of  claim 2 , wherein the P content is 0.05-0.08 wt %. 
     
     
         4 . The Cu—Zn alloy of  claim 2 , wherein the alloy contains 0.8-1.0 wt % Sn and ≤0.04 wt % P. 
     
     
         5 . The Cu—Zn alloy of  claim 1  according to the second alternative, wherein the Fe content is ≤0.04 wt % and the Mn content is 0.35-0.55 wt %. 
     
     
         6 . The Cu—Zn alloy of  claim 5 , wherein the P content is 0.05-0.08 wt %. 
     
     
         7 . The Cu—Zn alloy of  claim 1 , wherein the P content is 0.05-0.08 wt %. 
     
     
         8 . The Cu—Zn alloy of  claim 1  according to the first alternative, wherein the alloy contains 0.8-1.0 wt % Sn and ≤0.04 wt % P.