Through the improvement of the vertical hydraulic perforating device, the accuracy of wall thickness deviation can reach 5% ~ 7%. The extruder mold is simple, easy to design, manufacture and replace, suitable for the production of small batches, multi-specifications and stainless steel pipes in enterprises. The extrusion device can also produce a variety of steel pipes, a set of 50MN (5000t) extrusion device can produce 25~245mm specifications of steel pipes, more suitable for market demand than other pipe rolling units.
The biggest advantage of using extrusion processing method to produce stainless steel seamless pipe is that it can directly use continuous casting billet as raw material, so as to ensure the safety and stability of product service quality, flexible variety replacement, can choose to directly produce hot extruded finished pipe, but also can improve the production of various special-shaped section stainless steel pipes.
However, the stainless steel pipe produced by extrusion also has an obvious disadvantage, that is, the yield is low. In order to improve the yield rate, foreign production enterprises have improved the production process. For the varieties can generally use pre-drilling, hydraulic perforation machine reaming and extrusion into pipe production technology technology.
Cold-working raw material pipes can adopt different production processes according to specific conditions: on the vertical hydraulic perforating machine, the small-size steel pipes are directly punched and extruded with solid blanks; The billet used in the medium-sized steel pipe should be pre-drilled as small as possible, and the billet used in the large steel pipe should be pre-drilled with large holes, and then the billet used in the large steel pipe is directly extruded into a pipe by the extruder.
According to more than one analysis of the cold drawing and cold rolling production and processing of the design of stainless steel seamless pipe, can only be regarded as a semi-finished product, the accuracy of different grades is very low, often can not meet the requirements of enterprise users can put forward, such as uneven thickness of the pipe wall, the existence of bumps, internal and external research surface tension marks and spots or pits and other defects, it is necessary to continue to grind.
In China's industrialization process gradually accelerated today, for seamless stainless steel pipe has a higher demand, only to improve the stainless steel processing method technology, according to the production scale of the enterprise, capital investment and other aspects of comprehensive consideration, the selection of more suitable seamless stainless steel pipe production process, in order to ensure the production quality of seamless pipe, improve the economic benefits of the enterprise.
