Manufacture technology of bimetal composite pipe

Abstract

The invention discloses a manufacture technology of a bimetal composite pipe, which comprises the following steps of: 1) smelting structure layer carbon steel liquid according to a smelting technology of a carbon steel oxidizing method, and smelting a base body structure high-chromium iron liquid according to a smelting technology of an alloy non-oxidizing method; 2) forming by means of centrifugal pouring, wherein a centrifugal metal molding paint can adopt resin-coated sand or water base zircon powder paint; 3) injecting the carbon steel liquid into a mould; 4) pouring the high-chromium iron liquid when the temperature of the surface of the carbon steel liquid reaches the semi-solidification status, forming a transition layer between two alloys, and mutually melding to form into an integrated casting piece; and 5) immediately putting the casting part into a heat preserving furnace or embedding into the sand after the casting part is demoulded to gradually reduce the temperature. By adopting the technology, the manufacture technology adopts the metallurgical combination without a gape between the carbon steel and the high-chromium iron, leads the composite pipe to have high use security, and has high wear-resistant and corrosion-resistant capability, thereby prolonging the service life of the composite pipe.

Description

technical field [0001] The invention relates to a production process of a metal pipe, in particular to a production process of a bimetal composite pipe. Background technique [0002] Pipeline transportation is a common material transportation method in production. For example, the pulverized coal and ash of power plants, the slurry and tailings of mines, the pipelines of dredgers, and the materials of chemical plants, food factories, coal washing plants, cement plants, etc. are also often transported by pipelines, so the amount of pipelines is very large. huge. Because the transportation of materials in production is long-distance pressure transportation, the pipeline not only bears pressure, but also bears severe wear and corrosion. In order to use safety, it is necessary to give priority to the toughness of the pipeline. Therefore, Q235 and 16Mn steel are often used as pipelines, but Such steel pipes fail prematurely due to insufficient wear resistance and corrosion resi...

AI Technical Summary

Problems solved by technology

Because the transportation of materials in production is long-distance pressure transportation, the pipeline not only bears pressure, but also bears severe wear and corrosion. In order to use safety, it is necessary to give priority to the toughness of the pipeline. Therefore, Q235 and 16Mn steel are often used as pipelines, but Such steel pipes fail prematurely due to insufficient wear resistance and corrosion resistance, and the annual loss of steel pipes used to transport materials in China amounts to more than one billion yuan

[0003] In order to improve the service life of the pipeline, a variety of composite pipeline processes have emerged, such as using the lost foam vacuum suction casting method to cast a wear-resistant or corrosion-resistant alloy layer in the steel pipe, and using the self-propagating high-temperature synthesis method to sinter the ceramic layer in the steel pipe. There are also composite pipes inlaid with a layer of rubber lining in the steel pipe or bonded with a layer of ceramic sheets in the steel pipe, but the above-mentioned pipes have problems to varying degrees. There are inevitably large gaps between them, which often cause wear-resistant or corrosion-resistant layers to fall off; the ceramic layer of the composite pipe produced by the self-propagating high-temperature synthesis method is thin and brittle, and there are a large number of pores in the layer, which can only be used under low stress, soft It is used under abrasive working conditions; the composite pipe with rubber embedded in the steel pipe and ceramic sheet pasted cannot be used in the working conditions with severe corrosion, high temperature and sharp material shape