ANALYSIS OF AOD CONVERTER TRUNNION RUPTURE AND THE WELDING REPAIR PROCESS
In the present study,we have analyzed a rupture incident on converter trunnion in a certain factory and it adopts disc spring for buffer.Crack propagation paths indicate that this is caused by torsional fatigue.Detection results show large vibration speed of tilting mechanism appeared in the smelting process and vibration reduction performance of spring buffer is poor.Trunnion is made of 18MnMoNb low alloy steel,and bainite is its main structure.Martensite,lath bainite,ferrite and even widmanstatten transformations will occur during welding repair.Strict preheating and post weld heat treatment(PWHT)should be adopted to avoid welding cracks.Thermal cycle simulation shows preheat temperature higher than 210℃ can reduce lath bainite formation and refine microstructure effectively,the temperature of PWHT should exceed 600℃ to ensure the transformation of lath bainite to granular bainite.
AOD converter trunnion Torsional fatigue rupture 18MnMoNb Welding repair
Junwei Wang Hongliang Li Yanli Ma
Gansu Jiu Steel Group Hongxing Iron & Steel Co.,LTDNO.12 Eastern Xiongguan Road,Jiayuguan,Gansu,735100,China
国内会议
杭州
英文
495-501
2015-11-11（万方平台首次上网日期，不代表论文的发表时间）