Surface treatment of straight seam steel pipe

Long-distance oil and gas pipelines are an important means of energy security. In the process of anticorrosion construction of oil and gas pipelines, the surface treatment of straight seam steel pipes is one of the key factors determining the service life of pipeline anticorrosion, and it is the premise of whether the anticorrosion layer can be firmly combined with the steel pipe.

It has been verified by research institutions that the life of the anti-corrosion coating depends on factors such as coating type, coating quality and construction environment, and the surface treatment of straight seam steel pipes has an impact on the life of the anti-corrosion coating. About 50%. Therefore, it is necessary to strictly follow the requirements of the anti-corrosion layer specification for the surface of steel pipes, continuously explore and summarize, and continuously improve the surface treatment methods of steel pipes.

A method and production process for preventing straight seam steel pipes from breaking.

The cleaning of straight seam steel pipes uses solvents and emulsions to clean the steel surface to achieve the purpose of removing oil, grease, dust, lubricants and similar organic substances. However, it cannot remove rust, scale, welding flux, etc. on the surface of steel, so it is only used as an auxiliary means in anti-corrosion production.

The tool derusting of straight seam steel pipes mainly uses tools such as wire brushes to polish the steel surface, which can remove loose or lifted scale, rust, welding slag, etc. The rust removal by hand tools can reach Sa2 level, and the power tool rust removal can reach Sa3 level. If the iron oxide scale is firmly attached to the surface of the steel, the rust removal effect of the tool is not ideal, and the anchor pattern depth required for anti-corrosion construction cannot be reached.

The pickling of straight seam steel pipes generally uses chemical and electrolytic methods for pickling. Only chemical pickling is used for pipeline anticorrosion, which can remove scale, rust, and old coatings. Sometimes it can be used as retreatment after sandblasting and rust removal. . Although chemical cleaning can achieve a certain degree of cleanliness and roughness on the surface, its anchor pattern is shallow and it is easy to pollute the environment.

Straight seam steel pipe is a welded steel pipe in which the weld seam is parallel to the longitudinal direction of the steel pipe. It is usually divided into metric electric welded steel pipe, electric welded thin-walled pipe, transformer cooling oil pipe and so on. Compared with the seamless pipe, the production process of the longitudinal welded pipe is simple, the production efficiency is high, the cost is low, and the development is rapid. According to the production process, straight seam steel pipe can be divided into straight seam electric resistance welded steel pipe (ERW pipe) and submerged arc welded straight seam steel pipe.

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