Analysis and Process Control of Shrinkage and Inclusion Defects of Valve Steel Casting
The formation mechanism of the possible shrinkage and the different inclusion in valve steel casting and process control are analyzed.The main reason of the formation of the inclusion defects are unreasonable design of the pouring system,smaller flow gate,higher discharge velocity and the longer pouring time.Large discharge of the pour system,open cross-section ratio,fast pouring should be used to achieve the smooth filling with large discharge and low-velocity.Results of deoxidization refinement should be attended to purify liquid steel effectively;Skimming of the gating system should be strengthened,including using filtering technology and so on.In order to enhance feeding effect,riser should be used along with cold chill and insulation pad.