Large-caliber steam pipeline bending process

The invention discloses a large-caliber steam pipeline bending process. The large-caliber steam pipeline bending process comprises a bending transition section calibration step, a feeding positioning step, a heating bending step and a heat treatment step, wherein the width of a medium-frequency heating ring is 3-4 times of that of a pipeline, and in the heating bending step, the bending starting time is the time when the medium-frequency heating ring is heated to the middle position of a bending transition section. By means of the mode, the bending machining speed of the large-caliber steam pipeline can be obviously increased, wrinkles generated in the bending process are reduced, stress accumulation generated in the bending process of the pipeline is reduced, and the service life of the pipeline is prolonged. 本发明公开了一种大口径蒸汽管道弯管工艺，所述大口径蒸汽管道弯管工艺包括：弯折过渡段标定步骤、上料定位步骤、加热弯折步骤和热处理步骤，其中中频加热圈的宽度为管道3~4倍，在加热弯折步骤中，弯折开始时间为所述中频加热圈加热到弯折过渡段中间位置的时间。通过上述方式，本发明能够明显提高对大口径蒸汽管道的弯折加工速度，而且降低弯折过程中产生的皱褶，从而降低管道中的弯折中产生的应力堆积，提高管道的使用寿命。