Integrated stainless steel-carbon steel composite tube and preparation process and coating process thereof

Abstract

The invention discloses an integrated stainless steel-carbon steel composite tube and a preparation process and a coating process of the integrated stainless steel-carbon steel composite tube. The integrated stainless steel-carbon steel composite tube and the preparation process and the coating process of the integrated stainless steel-carbon steel composite tube mainly solve the problems that connection between base layers and composite layers of a lining tube, a bonding tube and a press fit tube is not firm, layering can occur easily, and performance is poor in the prior art. The integrated stainless steel-carbon steel composite tube comprises four layers of structures which are a stainless steel layer, a stainless steel-carbon steel mixed layer, a carbon steel layer and an epoxy resin layer in sequence from inside to outside. The stainless steel-carbon steel mixed layer is of an integrated structure formed by stainless steel and carbon steel in a metallurgical smelting mode, the stainless steel layer and the stainless steel-carbon steel mixed layer are of an integrated structure, and the carbon steel layer and the stainless steel-carbon steel mixed layer are of an integrated structure; the thickness ratio of the stainless steel layer to the carbon steel layer is 1:10. A beveled edge is further formed in the end of the integrated stainless steel-carbon steel composite tube, and the angle of the beveled edge ranges from 30 degrees to 35 degrees. The integrated stainless steel-carbon steel composite tube is simple in structure, low in price and good in performance, thereby being suitable for popularization and application.

Description

technical field [0001] The invention relates to a pipe, in particular to an integrated stainless steel-carbon steel composite pipe and its preparation process and plastic coating process. Background technique [0002] In the prior art, fluid transportation pipelines mainly include the following types: ordinary ductile iron pipelines, carbon steel pipelines, prestressed concrete pipelines, PE pipes, etc. The pressure bearing capacity, corrosion resistance, and external force damage resistance of the above pipelines are not good. , some special transportation pipelines, such as: drinking water transportation pipelines. At present, 90% of the pollution of drinking water comes from the pipeline itself. , but its high cost is not conducive to long-distance transportation. [0003] Further, a variety of composite steel products have been developed, mainly including two types of lined composite pipes and bonded composite pipes, such as the Chinese invention patent "Composite Stain...

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Problems solved by technology

[0002] In the prior art, fluid transportation pipelines mainly include the following types: ordinary ductile iron pipelines, carbon steel pipelines, prestressed concrete pipelines, PE pipes, etc. The pressure bearing capacity, corrosion resistance, and external force damage resistance of the above pipelines are not good. , some special transportation pipelines, such as: drinking water transportation pipelines. At present, 90% of the pollution of drinking water comes from the pipeline itself. , but its high cost is not conducive to long-distance transportation

[0003] Further, a variety of composite steel products have been developed, mainly including two types of lined composite pipes and bonded composite pipes, such as the Chinese invention patent "Composite Stainless Steel Pipe" with a publication number of 2351647Y, which uses stainless steel as the outer pipe, and then The outer stainless steel pipe is lined with a liner made of plastic or iron sheet. This type of composite stainless steel pipe combines the excellent performance of stainless steel with the low cost of plastic or iron sheet liner. However, the inner The lined composite pipe is not suitable for large-diameter pipeline transportation. The composite layer of the base layer and the lining is very easy to separate, and the welding between the pipes is also very troublesome. The Chinese invention patent "composite stainless steel plate" and the Chinese invention patent with the publication number CN201310168Y "a composite stainless steel decorative plate", its structure is mainly based on the stainless steel plate by bonding a layer of other materials This is also the main composite method of composite panels currently on the market; in addition, there is a composite pipe made of double-layer metal by lamination, which is similar to the bonded composite pipe and the lined composite pipe. It is also not suitable for large-diameter pipes, the connection between the composite layer and the base layer is not reliable, and it is easy to detach

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