Optimizing Production Process to Resolve Cold Cracking Issues in Railcar Bodies
The problem of cold cracking occurred in the production of 200 m sintering production line of a steel plant.The cracks mainly appeared at the intersection of vertical beam,shaft hole and reinforced plate of the car body.The reason is that the liquid resi-dence time in the solidification process of the casting is long,resulting in the decline of spheroidization effect,and the tensile strength and ductility are significantly reduced.When the internal stress of the car body exceeds the tensile strength and the ductility is low,cold cracking is caused.To solve this problem,the improvement measures are put forward,including reducing the pouring temperature,using high efficiency nodule agent,and optimizing the process pouring system.All these measures effectively reduce the internal stress,remove the cold crack defect,and improve the quality of the car body.Through these improvement measures,200 car body has been successful-ly piouduced,and cold crack defect,has been removed and obvious production benefits have been achieved.
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