Research on Lead-Free & Free Cutting Se-Bi Brass

The process to prepare lead-free and free cutting Se-Bi brass was introduced. The casting ingots of the lead-free and free cutting Se-Bi brass were prepared in a medium frequency indution furnace.Their microstruture,mechanical properties and corrosion resistance were mensurated.The results show that,when the Bi is added in the form of Cu-Bi master alloy at 1 200℃,Bi is distributed in the copper alloy uniformly. The mechanical properties, machinability and dezincification corrosion resistance of the alloy are better than HPb59-1 alloy. The mechanism that Bi improves the cutting capability of copper alloys is discussed by SEM and XRD analysis.