The invention relates to a method to make a rectangular steel pipe, specially a rectangular steel pipe with a sharp Angle by cold bend molding.
本发明涉及冷弯成型制造矩形钢管的方法，特别是具有一个尖角的矩形钢管的制造方法。
The invention relates to a method to make a rectangular steel pipe, specially a rectangular steel pipe with a sharp Angle by cold bend molding.
本发明涉及冷弯成型制造矩形钢管的方法，特别是具有一个尖角的矩形钢管的制造方法。
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