Brass alloy and method for manufacturing the same

Abstract

A brass alloy, with a total weight percentage thereof counted as 100 wt %, includes the following elements: 60 wt % to 65 wt % of copper, 0.1 wt % to 0.35 wt % of bismuth, 0.15 wt % to 0.5 wt % of antimony, a balance of zinc, and an inevitable impurity.

What is claimed is: 
     
         1 . A brass alloy, with a total weight percentage thereof counted as 100 wt %, the brass alloy comprising the following elements: 60 wt % to 65 wt % of copper, 0.1 wt % to 0.35 wt % of bismuth, 0.15 wt % to 0.5wt % of antimony, a balance of zinc, and an inevitable impurity. 
     
     
         2 . The brass alloy according to  claim 1 , further comprising one or a mixture of more than one selected from aluminum, tin, phosphorus, manganese, and boron, wherein total content of the selected mixture accounts for 0.2 wt % to 2 wt % of the brass alloy. 
     
     
         3 . The brass alloy according to  claim 1 , wherein total content of the inevitable impurity is less than 0.1 wt % of nickel, less than 0.1 wt % of chromium, or less than 0.1 wt % of iron. 
     
     
         4 . A method for manufacturing a brass alloy, comprising the following steps of:
 providing copper and manganese;   heating the copper and manganese until a temperature rises to between 1100 and 1150 degrees centigrade, so that the copper and manganese are formed to a molten copper-manganese alloy;   decreasing the temperature of the molten copper-manganese alloy to between 950 and 1000 degrees centigrade;   covering a surface of the molten copper-manganese alloy with a rice husk ash;   adding zinc to the molten copper-manganese alloy, so as to form a molten copper-manganese-zinc alloy;   removing slag from the molten copper-manganese-zinc alloy;   adding antimony, bismuth, aluminum, or tin to the molten copper-manganese-zinc alloy, to form a molten metal alloy;   increasing a temperature of the molten metal alloy to between 1000 and 1050 degrees centigrade, and adding a copper-boron alloy and a phosphorus-copper alloy, to form a molten brass alloy; and   tapping the molten brass alloy out of a furnace and casting the molten brass alloy to form the brass alloy.   
     
     
         5 . The method for manufacturing a brass alloy according to  claim 4 , wherein the step of removing slag from the molten copper-manganese-zinc alloy further comprises removing the slag by using a slag remover. 
     
     
         6 . The method for manufacturing a brass alloy according to  claim 4 , wherein the step of heating the copper and manganese until a temperature rises to between 1100 and 1150 degrees centigrade lasts 30 minutes. 
     
     
         7 . The method for manufacturing a brass alloy according to  claim 4 , wherein the brass alloy, with a total weight percentage thereof counted as 100 wt %, comprises the following elements: 60 wt % to 65 wt % of the copper, 0.1 wt % to 0.35 wt % of the bismuth, 0.15 wt % to 0.5wt % of the antimony, a balance of the zinc, and an inevitable impurity. 
     
     
         8 . The method for manufacturing a brass alloy according to  claim 4 , wherein total content of aluminum, tin, phosphorus, manganese, and boron accounts for 0.2 wt % to 2 wt % of the brass alloy. 
     
     
         9 . The method for manufacturing a brass alloy according to  claim 4 , wherein a copper-manganese alloy is provided as a material for providing the copper and the manganese. 
     
     
         10 . A brass alloy, with a total weight percentage thereof counted as 100 wt %, comprising 60.5 wt % to 64.5 wt % of copper, 0.15 wt % to 0.3 wt % of bismuth, 0.2 wt % to 0.35 wt % of antimony, 0.1 wt % to 0.25 wt % of aluminum, 0.05 wt % to 0.4 wt % of manganese, 0.1 wt % to 0.6 wt % of tin, 0.05 wt % to 0.2 wt % of phosphorus, 0.002 wt % to 0.005 wt % of boron, a balance of zinc, and an inevitable impurity.