一个钢管的生产流程如下：圆管坯放在要被切割的高温轧制线上，继续升温，穿孔，轧制直到管坯大小基本成型。

The process of a pipe production is the following: a round cast workpiece is put onto a hot rolling line where it is cut, heated, stitched and rolled till a pipe of necessary size is ready.

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同时，讨论了明渠突扩流动和圆管突扩流动中存在的不止一个对称解问题，并就此问题未被重视的原因进行了初步分析。

And then, it is discussed that there are not only one symmetric solutions in the sudden-expansion flows of open channel and round pipe.

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