Feasibility Study on Use of Austenite-bainite Nodular Cast Iron to Make Down-prebending Die for Weld Pipe Prebending Machine

With employment of the nodularization + the secondary inoculation process,and the isothermal quenching process,the class 2 austenite-bainite nodular cast ron is obtained.Compared are the austenite-bainite nodular cast iron,the pearlite nodular cast iron and the Cr12Mo1V1 steel for cold-working die purpose in terms of mechanical property and friction/wear-resistance characteristics.And the comparison result reveals that the austenite-bainite nodular cast iron is in possession of good mechanical propertis and excellent friction/wear resis-tance.Owing to the fact that when undergoing friction/wearing,the bainite in the structure of the material func-tions in well conveying stress,and playing a supporting role,the wear-resistance thereof is improved.Further-more,rather high hardness and elastic modulus of the material,and surface lubrication with graphite flour for it lead to less friction coefficient.The conclusion says that it is feasible to use the above mentioned austenite-bainite nodular cast iron for fabrication of the down-prebending die for the weld pipe prebending machine.