Preparation method of anticorrosion coiled steel pipe for marine environment

A technology for rolling steel pipes and marine environment, applied in the field of steel pipe manufacturing and processing, can solve problems such as poor corrosion resistance, short validity period, easy aging, etc., and achieve the effect of solving short validity period and simple method

Inactive Publication Date: 2016-08-17
HEFEI ZIKING PIPE INC
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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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  • Preparation method of anticorrosion coiled steel pipe for marine environment

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Embodiment 1

[0023] A method for preparing a corrosion-resistant rolled steel pipe for marine environments, comprising the following steps:

[0024] (1) Plate detection: through ultrasonic non-destructive testing of steel plates;

[0025] (2) Blank cutting and beveling;

[0026] (3) Rolling: The polished steel plate is rolled into an "O" shape by using the supporting rolling technology; Cantilever with bearings, the cantilever rotates freely on the inner wall of the pile pipe during the rolling process, which has reached the top support function and guaranteed the ellipticity of the steel pipe.

[0027] (4) UT flaw detection for group alignment, circle calibration, and longitudinal seam;

[0028] (5) Internal and external welding of longitudinal seams: internal welding adopts double-wire tandem submerged arc automatic welding, the first wire is DC, the current is 825A, and the voltage is 31V; the second wire is AC, the current is 400A, and the voltage is 34V; the distance between welding...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/08B21C37/30
CPCB21C37/08B21C37/0807B21C37/30
Inventor 彭静吴宏根郑家胜张保宇
Owner HEFEI ZIKING PIPE INC
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