结果表明，与圆管、板材等型材的压弯相比，薄壁矩形断面管压弯更容易产生严重的截面畸变；
The results show that the severe cross section distortion takes place much easier in the thin-walled rectangular tubes than that in the circular tubes and plank stuff.
最终产品为圆管，方管，矩形管，管子断面从1英寸至5英寸。
The final product is tubes round, square, and rectangular. form 1in to 5in (regular sections).
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