Preparation method of anticorrosion coiled steel pipe for marine environment

Abstract

The invention discloses a preparation method of an anticorrosion coiled steel pipe for the marine environment. The method includes the steps of firstly, detecting a plate; secondly, cutting the plate through flames and blanking, and forming grooves; thirdly, conducting coiling, wherein a polished steel plate is coiled into an O shape through a supporting type coiling technology; fourthly, conducting pairing, roundness correcting and longitudinal seam UT flaw detecting; fifthly, conducting longitudinal seam internal and external welding, wherein in the internal welding process and the external welding process, an anticorrosion welding agent are adopted, and a laser welding seam automatic tracking device with tracking precision of 0.25 mm is adopted; sixthly, conducting annular seam welding; seventhly, conducting welding seam residual height grinding, wherein seam surplus height is ground flat through a seam surplus height grinding machine; eighthly, conducting annular seam UT flaw detecting and X-ray flaw detecting; ninthly, marking the product for leaving a factory. The method is simple and solves the problems that an existing steel pipe for the marine environment is short in validity period, prone to ageing, poor in weather resistance, poor in corrosion resistance, low in size precision and the like.

Description

technical field [0001] The invention relates to a method for preparing a corrosion-resistant rolled steel pipe for marine environment, and belongs to the technical field of steel pipe manufacturing and processing. Background technique [0002] Oil and natural gas are important energy sources for the development of the national economy, and their proportion in energy consumption is increasing day by day, while steel pipe transportation has become the most economical, safe and uninterrupted long-distance transportation tool for oil and natural gas. The offshore oil and gas reserves are abundant, and it has become an inevitable trend to develop resources into the ocean. The marine environment is very complex, and submarine pipelines have high requirements for steel pipe materials. The current steel pipes for marine environment have shortcomings such as short validity period, easy aging, poor weather resistance, poor corrosion resistance, and low dimensional accuracy. Content...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a method for preparing corrosion-resistant rolled steel pipes for marine environments, and solve the problems of short validity periods, easy aging, poor weather resistance, poor corrosion resistance, and dimensional accuracy of existing steel pipes for marine environments. low level problem

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