At present, the mainstream process of manufacturing stainless steel seamless tube is hot extrusion. At the same time of phasing out the hot-rolled steel pipe unit, the extrusion unit is becoming the main unit of the global production of stainless steel seamless tube.
Most of these extruding units are used to make steel tubes, with the exception of a few used for profile extrusion. The main variety is stainless steel seamless tube, compared with rolling process, extrusion process is characterized by metal deformation process will bear three directions of compression stress. In this kind of optimal stress state, for the stainless steel pipe with many types and high deformation resistance, it can form satisfactory deformation, internal and external surface quality and metallographic microstructure.
The best stainless steel tube made by extrusion process can be directly to continuous casting billet as raw material, stainless steel seamless tube quality stability, and flexible replacement. It can directly manufacture the finished stainless steel pipe by hot extrusion, and can also be used to produce all kinds of special-shaped stainless steel pipe. However, the disadvantage of extrusion method is that the rate of finished stainless steel pipe is low.
In order to increase the yield of stainless steel pipe, there are production enterprises to optimize the production process. If it is a high requirement of the variety usually use pre-drilling, hydraulic perforator reaming and extrusion into the pipe production process, and the requirements of the general cold processing raw material pipe is based on the actual situation with different production processes. For example, small specifications of stainless steel pipe using solid billet directly in the vertical hydraulic perforator perforation and extrusion into the pipe, medium specifications of stainless steel pipe used billet pre-drilling holes, vertical hydraulic perforator reaming and extrusion into the pipe. The billets used for large steel pipes are pre-drilled into large holes and then directly entered the extruder to form pipes.
Post time: Apr-19-2023