Steel-plastic composite steady-state pipe

Abstract

The invention discloses a steel-plastic composite steady-state pipe which comprises a plastic inner layer, a steel pipe layer and a plastic outer layer. The steel pipe layer is arranged between the plastic inner layer and the plastic outer layer, the surface of the steel pipe layer is provided with an organic passive film layer, the inner wall of the steel pipe layer is provided with protrusions which are arranged in the axial direction of the pipeline, the protrusions are provided with through holes, and reinforcing ribs are arranged on the steel pipe layer in the axial direction of the pipeline. According to the steel-plastic composite steady-state pipe, the strength of the composite pipeline can be effectively improved, and meanwhile the distortion resistance strength of the pipeline can be improved.

Description

technical field [0001] The invention relates to the technical field of pipes, in particular to a steel-plastic composite stable pipe. Background technique [0002] There are many classifications of steel-plastic composite pipes, which can be classified according to the structure of the pipe: steel strip reinforced steel-plastic composite pipe, seamless steel pipe reinforced steel-plastic composite pipe, perforated steel strip steel-plastic composite pipe and steel mesh skeleton steel-plastic composite pipe. At present, the most popular on the market is the steel belt reinforced steel-plastic composite pipe, which is what we often call the steel-plastic composite pressure pipe. The middle layer of this pipe is a steel belt layer formed by butt welding of high-carbon steel belt through crimping. Both inner and outer layers are high-density polyethylene (HDPE). The middle layer of this kind of pipe is a steel belt, so the pressure bearing performance of the pipe is very good. ...

AI Technical Summary

Problems solved by technology

[0003] However, in order to save costs or facilitate processing, the existing steel-plastic composite pipes usually have through holes on the steel pipes. In this way, they are integrally formed by extrusion, the production process is simple, and the processing cost is low. A lot of holes make the inner and outer layers of PE organically combined into one. Although the problem of compounding steel and plastic is solved, the oxygen barrier performance of the steel-plastic pipe is sacrificed. Moreover, due to the existence of the hole network on the steel belt, it is largely The compressive strength of this type of steel-plastic pipe is reduced, and under high-pressure working conditions, it is prone to local bursting of the pipe

In addition, when the steel-plastic pipe is subjected to radial distortion, the steel-plastic contact layer is easily peeled off from each other, causing the pipe to be damaged.

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