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Manufacturing method for large-strain-resistant corrosion-resistant seamless line pipe for marine environment R-Lay laying

A technology of seamless line pipe and large strain resistance, which is applied in the field of marine resource exploitation and oil and gas transportation, can solve the problems of unmentioned corrosion resistance and other problems, and achieve good resistance to HIC and SSC performance, good use effect, and good welding performance. Effect

Inactive Publication Date: 2016-05-04
TIANJIN PIPE (GROUP) CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN102534377A discloses a X70 grade anti-large deformation pipeline steel plate with excellent toughness and its preparation method, which belongs to the technical field of hot-rolled steel plate and low-carbon micro-alloy steel, and does not mention corrosion resistance
There is no report on the seamless line pipe with high strength (≥415MPa) resistance to large strain and 3 times of 3% tension-compression cycle test

Method used

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  • Manufacturing method for large-strain-resistant corrosion-resistant seamless line pipe for marine environment R-Lay laying
  • Manufacturing method for large-strain-resistant corrosion-resistant seamless line pipe for marine environment R-Lay laying
  • Manufacturing method for large-strain-resistant corrosion-resistant seamless line pipe for marine environment R-Lay laying

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Embodiment Construction

[0018] The manufacturing method of the large-strain and anti-corrosion seamless line pipe for marine environment R-Lay laying of the present invention is described in conjunction with the accompanying drawings.

[0019] The present invention relates to a method for manufacturing large-strain, corrosion-resistant, high-strength seamless line pipes for R-Lay laying in marine environments. A line pipe satisfying corrosion-resistant high-strength ≥ 415MPa for acidic environments, the method includes the following steps:

[0020] a. Ingredients The composition weight % of large strain and corrosion resistant seamless line pipe for marine environment R-Lay laying is: C0.05~0.13%, Si0.20~0.40%, Mn1.0~1.40%, P≤ 0.010%, S≤0.002%, Ni0.05~0.30%, Cr0.05~0.30%, Mo0.05~0.15%, Als0.010~0.050%, N≤0.010%, Nb0.010~0.050%, V0. 03~0.08%, Cu0.05~0.25%, Ti0.008~0.030%, Ca0.0005~0.0040%, Pb≤0.020%, Sn≤0.020%, As≤0.030%, Sb≤0.015%, Bi≤0.015% , B≤0.0005%, the balance is Fe and impurities; carbon equ...

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Abstract

The invention relates to a manufacturing method for a large-strain-resistant corrosion-resistant seamless line pipe for marine environment R-Lay laying. The method is used for manufacturing the line pipe which is suitable for shallow sea and deep sea reelpipe manner laying and can meet the requirement that the corrosion-resistant high strength is larger than or equal to 415 MPa in an acid environment after repeated twining and straightening are carried out. The method includes the steps of burdening and pipe manufacturing, and a pipe material meeting the requirement for conveying exploited oil and gas resources in the shallow sea and deep sea R-Lay laying manner is manufactured. The manufacturing method has the beneficial effects that the seamless line pipe has the good large-strain-resistant performance, it is guaranteed that the strength is larger than 415 MPa after tension-compression cycling is carried out three times under 3% strain, and the -20 DEG C ballistic work is larger than 300 J. The good HIC and SSC resistance is achieved, the CSR is smaller than or equal to 1.5%, the crack length rate is smaller than or equal to 5%, the CTR is smaller than or equal to 3%, and breakage can be avoided when 100% loading is carried out for 96 hours in the SSCB method. The large-strain-resistant corrosion-resistant seamless line pipe is widely suitable for the shallow sea and deep sea R-Lay laying manner.

Description

technical field [0001] The invention relates to the field of marine resource exploitation and oil and gas transportation, in particular to a method for manufacturing a high-strength seamless steel pipe with high strain resistance and hydrogen sulfide corrosion resistance used in the R-lay laying method for marine environments. Background technique [0002] As the cost of transportation pipelines decreases, high-strength and large-deformation pipelines are required in environments such as crossing discontinuous permafrost layers, high and low undulating landslide deformation, and deep-sea R-Lay laying. R-Lay (Reel-Lay, rolled pipe laying) was originally one of the main laying methods for deepwater and ultra-deepwater pipelines. In recent years, due to its high laying efficiency, it is also suitable for shallow sea laying based on strain design. There are two critical strain limits for strain-based design, one is the tensile strain limit and the other is the compressive strain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/04C22C38/16C22C38/14C22C38/12C22C38/08C22C38/06C22C38/02C21D8/10
CPCC22C38/18C21D8/105C22C38/002C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16
Inventor 孙宇李艳张传友岳世斌刘江成赵兴亮张国柱周晓锋边令喜魏刚
Owner TIANJIN PIPE (GROUP) CORP
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