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Cross-section of the poor quality seamless steel pipe
Source :本站   Time:4/10/2017 9:48:28 PM   hit:

  Cross-section of the poor quality seamless steel pipe is elliptical, because the manufacturers in order to save materials, the finished product before the two roll down the amount is too large, the strength of this steel greatly reduced, but also does not meet the external dimensions of screw steel standards.

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