Cold-drawn seamless steel pipe production method?


　　First, no mandrel pull (pull only when the die is not mandrel);
　　Second, short mandrel pull (with extubation die when the pull and the axis of the fixed length of the short mandrel);
　　Third, the long mandrel pull (pull out with the extubation die and pull the steel pipe with the length of the length of the pipe is slightly larger than the length of the mandrel)

　　Fourth, the swing mandrel pull (pull with the extubation die and not for axial fixed and can be self-stable in the deformation area in the short mandrel). During which the first two kinds of production in the production was particularly prevalent; coreless rod drawing to reduce the outer diameter of the steel pipe; the other three with the mandrel of the rod is used to tighten the wall thickness of the pipe, together with a certain reduction Deformation.

　　Original URL：http://www.xysteelpipe.com/info/Cold-drawn-seamless-steel-pipe-production-method-434-1.htm

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