High intensity straight-line joint pipeline steel tube fabrication technique using high-frequency electric resistance welding

Abstract

The invention relates to the manufacturing technical field of steel pipes for long-distance transport pipes for petroleum, natural gas, mineral powder and the like, in particular to a pipeline steel pipe manufacturing technology employing straight high-frequency resistance welding. Raw materials meeting requirements are purchased, wherein, the requirements comprise physical properties, chemical compositions and mechanical properties of the raw materials. The raw materials are inspected to determine whether the physical properties, the chemical compositions and the mechanical properties meet the requirements. The technology comprises steel pipe manufacturing preparation, determination of production line moulding process parameters, determination of welding process parameters and determination of auxiliary material parameters. The pipeline steel pipe manufacturing technology employing the straight high-frequency resistance welding can help manufacture 632.2X11.1-60 pipeline steel pipes, various performance indexes of the steel pipes meet the requirements of pipeline steel pipes (USA API SPEC 5L PSL2 44 Standard), the heights of an inside seam and an outside seam are identical with the pipe wall of a parent material, and the technology perfectly solves the engineering anti-corrosive difficulties. The straight high-frequency pipeline pipe manufacturing technology has the advantages of high manufacturing efficiency, fast speed and low cost.

Description

technical field [0001] The invention relates to the technical field of manufacturing steel pipes for long-distance transportation pipelines such as oil, natural gas, and mineral powder, in particular to a manufacturing technology of high-strength straight seam pipeline steel pipes using high-frequency resistance welding. Background technique [0002] At present, at home and abroad, the steel pipes used for pipelines such as straight seam high-frequency resistance welded pipes to transport oil, natural gas, and mineral powder are basically steel pipes with a diameter of less than 508mm. The geometric size of the steel pipe is controlled by the outer diameter. Straight seam submerged arc welded steel pipe or spiral seam submerged arc welded steel pipe. Due to the internal and external weld reinforcement of the spiral submerged arc welded steel pipe, the anti-corrosion layer cannot fit well on the steel pipe surface when the steel pipe is anti-corrosion, thereby reducing the li...

AI Technical Summary

Problems solved by technology

Due to the internal and external weld reinforcement of the spiral submerged arc welded steel pipe, the anti-corrosion layer cannot fit well on the steel pipe surface when the steel pipe is anti-corrosion, thus reducing the service life of the anti-corrosion layer and thus affecting the life of the entire pipeline

In addition, the production speed of spiral submerged arc welded steel pipe is only one-tenth of the production speed of straight seam high-frequency resistance welded pipe, which cannot improve the construction speed of pipeline construction

[0003] The large-diameter high-frequency longitudinal welded pipe production line is in the stage of rapid development, and the production equipment can meet the needs of production, but the manufacturing technology is still in the development stage

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