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入口活套作为连续退火生产线入口段与工艺段的枢纽，其稳定运行对整个生产线的正常运行起着非常重要的作用。介绍了马鞍山钢铁股份有限公司硅钢分厂连续退火机组入口活套的组成结构、主要技术参数和入口活套运行速度，重点对入口活套的停机时间和套量进行了详细的计算和分析，确定了入口活套的合理套量和入口最小上卷吨位，从而确保连退机组连续稳定地运行，同时创造了较大的经济效益。“,”Entry loop is the hub of entrance section and technological section in continous annealing line.The stably running plays a very important role.The composing,main technology parameters and running speed diagram of entry loop of continuous annealing line (CAL)in Si-Steel Plant of Ma anshan Iron and Steel Co.,Ltd.were introduced.The stop time and length of entry loop were calculated and analyzed.The stably running of CAL can be assured based on the reasonable calculation results,meanwhile,created a larger economic benefits.