Low-lead brass alloy for use in member for water works

Abstract

An object of the present invention is to provide a brass alloy, in which the content of Bi is reduced to secure a good recyclability while maintaining the dezincification corrosion resistance required for a member for water works, and which is capable of exhibiting an erosion-corrosion resistance and excellent mechanical properties to be used as a member for water works. This brass alloy contains: 24% by mass or more and 34% by mass or less of Zn; 0.5% by mass or more and 1.7% by mass or less of Sn; 0.4% by mass or more and 1.8% by mass or less of Al; 0.005% by mass or more and 0.2% by mass or less of P; and 0.01% by mass or more and 0.25% by mass or less of Pb; with the balance being copper and an unavoidable impurity(ies).

1 . A low-lead brass alloy for use in a member for water works, the brass alloy comprising: 24% by mass or more and 34% by mass or less of Zn; 0.5% by mass or more and 1.7% by mass or less of Sn; 0.4% by mass or more and 1.8% by mass or less of Al; 0.005% by mass or more and 0.2% by mass or less of P; and 0.01% by mass or more and 0.25% by mass or less of Pb; with the balance being copper and an unavoidable impurity(ies);
 wherein, in cases where the brass alloy has a content of Sn of less than 1.0% by mass, the contents of Al and Sn in % by mass satisfy the following Inequality (1):
   Al+2×Sn≧2.8  (1).
 
   
     
     
         2 . The low-lead brass alloy for use in a member for water works according to  claim 1 , wherein the content of Sn is 1.0% by mass or more. 
     
     
         3 . The low-lead brass alloy for use in a member for water works according to  claim 1 , further comprising 0.0005% by mass or more and 0.015% by mass or less of B. 
     
     
         4 . The low-lead brass alloy for use in a member for water works according to  claim 1 , further comprising 0.1% by mass or more and 1.8% by mass or less of Ni. 
     
     
         5 . The low-lead brass alloy for use in a member for water works according to  claim 2 , further comprising 0.0005% by mass or more and 0.015% by mass or less of B. 
     
     
         6 . The low-lead brass alloy for use in a member for water works according to  claim 2 , further comprising 0.1% by mass or more and 1.8% by mass or less of Ni. 
     
     
         7 . The low-lead brass alloy for use in a member for water works according to  claim 3 , further comprising 0.1% by mass or more and 1.8% by mass or less of Ni. 
     
     
         8 . The low-lead brass alloy for use in a member for water works according to  claim 5 , further comprising 0.1% by mass or more and 1.8% by mass or less of Ni.