Practice of Shooting Rolling Mark Defects on 60kg/m Steel Rail Heads in Pansteel
In allusion to the rolling mark defects on 60 kg/m steel rail heads produced by Rail & Beam Plant of Panzhihua Vanadium Co.,Ltd. of Panzhihua Iron and Steel Group,it was concluded that the main causes leading to the defects were that the webs of steel rails were cracked due to the oversize blanks,the rail heads at the steel-going entry ends of the rolled pieces were longer than the rail feet and that the U2 head vertical roll was in dead burning. By taking such shooting measures as carrying out chamfering treatment for casting billets,optimizing the rolling schedule of BD1 rolling mill and optimizing the materials for making the U2 head vertical roll,the inferior rolling marks and the overruling rate of 60 kg/m rail heads were reduced from 0.45％ to 0.12％,the frequency of dead burning by the U2 head vertical rolls was significantly reduced,and the time for grinding U2 head vertical rolls per shift was reduced from 30 min to 10 min,and the quality of products and production efficiency were significantly improved.
steel railrolling marks on rail headcomputer simulationrolling schedule
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