LEAD-FREE FREE-CUTTING ALUMINUM BRASS ALLOY AND ITS MANUFACTURING METHOD

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The present invention provides lead-free free-cutting aluminum brass alloys. In one embodiment, the alloy comprises : 57.0-63.0wt% Cu, 0.3-0.7wt% Al, 0.1-0.3wt% Bi, 0.2-0.4wt% Sn, 0.01-0.15wt% P, and the balance being Zn and unavoidable impurities. In another embodiment, the alloy further comprises 0.1-0.5wt% Si, at least two elements selected from the group of 0.01-0.15wt% Mg, 0.0016-0.0020wt% B, and 0.00 1 - 0.05wt% rare earth elements. The inventive alloys have excellent castability, weldability, cuttability and corrosion resistance. They are suitable for low pressure die casting, gravity casting, horizontal continuous casting, forging and extrusion. Their metal material cost is lower than bismuth brass. They are particularly applicable for components used in drinking water supply systems and other structural components. They are new environmentally- friendly free-cutting aluminum brass alloys.