Steel-lined polytetrafluoroethylene composite tube

Abstract

The invention discloses a steel-lined polytetrafluoroethylene composite tube. The steel-lined polytetrafluoroethylene composite tube comprises a plastic layer positioned on an inner layer and a steel tube structural layer positioned on an outer layer, wherein pits which are internally concave are uniformly formed in the inner surface of the steel tube structural layer; the pits are of corrugated structures which are small in inner volume, great in middle volume and small in outer volume; outer volume of the pits is greater than inner volume of the pits; each pit is provided with an angle of inclination for inclining towards a fluid flowing direction; the plastic layer is made of a polytetrafluoroethylene material; and the plastic layer is compounded in the steel tube structural layer and the polytetrafluoroethylene material is completely filled into the pits. With the adoption of the structure, the steel-lined polytetrafluoroethylene composite tube bears very great corrosion performance, so that the polytetrafluoroethylene material is firmly adhered to the inner surface of the steel tube structural layer, and therefore, compounding strength is greatly improved, and firmness is very good; and a composite polyolefin inner coating has good flexible effect and effectively protects the polytetrafluoroethylene material, so that the service life of the steel-lined polytetrafluoroethylene composite tube is further prolonged.

Description

technical field [0001] The invention relates to a pipe material for pipelines, in particular to a steel-lined polytetrafluoroethylene composite pipe. Background technique [0002] The steel-lined composite pipe is composed of plastic pipe and steel pipe. Among them, the steel pipe with flange is used as the outer layer of the reinforced sheath, the plastic pipe is used as the inner layer of the base pipe, and the base pipe of the inner layer extends along the nozzle of the outer layer to the The outer edge of the flange end face forms an integral pipeline equipment. However, because the pipeline is mainly used to transport concentrated nitric acid and aqua regia corrosive liquids, although the existing composite pipes can achieve a certain corrosion resistance, with long-term use, the During the flow of the liquid, the base pipe is easily damaged under the combined effects of positive pressure, flow rate and corrosion, so that the base pipe falls off from the steel pipe, whi...

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Problems solved by technology

[0002] The steel-lined composite pipe is composed of plastic pipe and steel pipe. Among them, the steel pipe with flange is used as the outer layer of the reinforced sheath, the plastic pipe is used as the inner layer of the base pipe, and the base pipe of the inner layer extends along the nozzle of the outer layer to the The outer edge of the flange end face forms an integral pipeline equipment. However, because the pipeline is mainly used to transport concentrated nitric acid and aqua regia corrosive liquids, although the existing composite pipes can achieve a certain corrosion resistance, with long-term use, the During the flow of liquid, it is easy to damage the base pipe material under the combined effects of positive pressure, flow rate and corrosion, so that the base pipe material falls off from the steel pipe, which affects the service life

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