A 3PE anti-corrosion production line and anti-corrosion process for the outer surface of steel pipes

Abstract

The invention discloses a 3PE anti-corrosion production line for the outer surface of a steel pipe and an anti-corrosion process. The 3PE anti-corrosion production line comprises a flame preheating furnace, a blasting rust removal machine, a tube-in purge device, a first intermediate frequency heating furnace, a lye washing chamber, a high-pressure water washing chamber, a silane passivation chamber, a drying curing chamber, a second intermediate frequency heating furnace, an epoxy powder spraying device, an additive and polyethylene cladding molding device, a sprinkler water cooling device, an electric spark leak detection device and a tube end polishing device which are arrayed in sequence. By means of the 3PE anti-corrosion production line, the pollution problem of an existing production line and process in the 3PE anti-corrosion of a welded tube is solved, a phosphoric acid passivation film is replaced with a silane film successfully, and the anti-corrosion effect is high.

Description

Technical field: [0001] The invention belongs to the technical field of welded steel pipe manufacturing, in particular to a 3PE anti-corrosion production line and anti-corrosion process for the outer surface of steel pipes for continuous production. [0002] technical background: [0003] Most of the existing 3PE steel pipe anti-corrosion production lines use intermediate frequency preheating, shot blasting and dust treatment to carry out pre-treatment before coating, so as to reach the anchor pattern depth and cleanliness level on the surface of the steel pipe before coating, thereby ensuring the anti-corrosion layer of the steel pipe. the quality of. Although this process layout has been used all the time, and almost all pipe factories in China adopt this method, how to further improve the test indicators such as cathodic peeling strength, prolong the service life of steel pipes and reduce environmental pollution in the process of steel pipe anticorrosion is an existing pro...

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Problems solved by technology

Although this process layout has been used all the time, and almost all pipe factories in China adopt this method, how to further improve the test indicators such as cathodic peeling strength, prolong the service life of steel pipes and reduce environmental pollution in the process of steel pipe anticorrosion is an existing problem. Process conditions can not be achieved

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