轧管过程中变形量的计算，既是理论问题，又是生产实际问题。根据变形机理，采用当量变形作为衡量轧管过程中变形量大小，并给出了应用实例。 The calculation of the deformation during the rolling process is not only a theoretical issue but also a production practical problem. According to the deformation mechanism, equivalent deformation is used as a measure of the amount of deformation in the process of rolling pipe and an application example is given.