Abstract: Diamond grits are brazed on the surface of 0Cr18Ni9 stainless steel wire by using Cu-Sn-Ti pre-alloyed powder as interlayer materials,thus producing diamond wire saw with a diameter of 0.8 mm.Mechanical properties of steel wire and wire saws are obtained by tensile tests,and the crystalline structures of wire cross sections before and after brazing are analyzed.Fracture morphology of the wire is observed by using scanning electron microscope.Then the tensile fracture mechanism is analyzed.Resultsshow that diamond grits are firmly brazed on 0Cr18Ni9 stainless steel surface,forming a wearresistant layer.The tensile strength of brazed wire saws remains over 700 MPa and yield strength 600 MPa with plasticity enhanced largely.Austenite in wire matrix grows and the uniformity of the tissue increases sharply.The tensile fracture mode of heated wire is ductile,and the tensile failure mode of working layer is alloy break and strip from the matrix.