HAl64-5-4-2 alloy is one of complex brasses with high strength

wear resistance and impact resistance used for car’s synchronous gear ring and other wear resistant parts. In the process of extruded tube production

some key technologies

such as smelting and uniformity of Fe

Mn

production technique of non-defective ingot

control of tube straightness

were optimized. The specification was showed as follows: melting point of the alloy 910.4 ℃;flowing point 949.2 ℃; △H114.6 J/g

and excellent heat workability. Microstructure of the alloy-β phase at more than 550 ℃; while α+β phase at less than 550 ℃

wear resistant particle with multi-element rich Fe phase. The maximum mechnical properties σ b=796 MPa

σ 0.2=675 MPa

δ 5=20%

HB=218. The relation between microstructure and the properties was examined under different heat treatment conditions.