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Pay attention when using honing tubes

   What exactly causes concave folds to occur? There are several possibilities: first, the diameter reduction during the cold drawing process is too large or the steel pipe hammer head transitions too quickly; second, the thickness of the pipe wall is uneven and partially too thin; the thirty-year honing equipment is too old and cannot meet the processing requirements of the pipe.
   After these numerous improvements, similar bad flaws should be able to be improved.

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