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Manufacturing method of high-strain marine pipeline with large thickness-diameter ratio

A manufacturing method and high-strain technology, applied in manufacturing tools, arc welding equipment, welding equipment, etc., to achieve high and low temperature fracture toughness, reduce heat input, and increase heat

Active Publication Date: 2021-06-08
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]However, the current research on high-strain marine pipelines with large thickness-to-diameter ratio is still in a blank stage in China

Method used

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  • Manufacturing method of high-strain marine pipeline with large thickness-diameter ratio
  • Manufacturing method of high-strain marine pipeline with large thickness-diameter ratio
  • Manufacturing method of high-strain marine pipeline with large thickness-diameter ratio

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Embodiment Construction

[0054] In order to make the purpose, technical solution and advantages of the present disclosure clearer, the implementation manners of the present disclosure will be further described in detail below in conjunction with the accompanying drawings.

[0055] Embodiments of the present disclosure provide a method for manufacturing a large thickness-to-diameter ratio high-strain marine pipeline, such as figure 1 As shown, the manufacturing method includes:

[0056] Step 101: providing a pipeline steel plate, the metallographic structure of the pipeline steel plate includes acicular ferrite a and fine-grained ferrite b (see figure 2), the composition mass percentage of pipeline steel plate is C: 0.02~0.07wt%, Mn: 1.50~1.80wt%, P≤0.015wt%, S≤0.015wt%, Si: 0.10~0.30wt%, Nb: 0.020~ 0.080wt%, V≤0.03wt%, Ti≤0.025wt%, Al≤0.06wt%, N≤0.008wt%, Cu≤0.30wt%, Cr≤0.30wt%, Mo≤0.30wt%, Ni: 0.10~ 0.50wt%, B≤0.0005wt%, Pcm: 0.13~0.18wt%, Ceq: 0.34~0.36wt%, (Nb+V+Ti)≤0.15wt%, N≤0.0035wt%, O≤0.000...

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Abstract

The invention provides a manufacturing method of a high-strain marine pipeline with a large thickness-diameter ratio, and belongs to the technical field of pipeline manufacturing. The manufacturing method comprises the following steps: providing a pipeline steel plate, wherein the metallographic structure of the pipeline steel plate comprises acicular ferrite and fine grain ferrite; providing a forming mold, wherein the forming mold is designed based on the designed pipe diameter and the designed wall thickness of the marine pipeline; forming and processing the pipeline steel plate by using a JCO forming process through the forming mold to obtain a pipeline blank; and welding the two longitudinal edges of the pipeline blank together by adopting a welding gun adopting a large-stem extension process to obtain the marine pipeline. According to the manufacturing method, the manufacturing of the high-strain marine pipeline with large thickness-diameter ratio can be realized.

Description

technical field [0001] The disclosure belongs to the technical field of pipeline manufacturing, and in particular relates to a manufacturing method of a large thickness-to-diameter ratio high-strain marine pipeline. Background technique [0002] Deepwater oil and gas, especially the rich oil and gas resources in the South China Sea, is the new world and the main battlefield for my country's future energy development. Submarine pipelines are the main components of offshore oil and gas fields, and once they leak, they will bring serious environmental disasters. Deep-water pipelines will bear large compression, tensile loads and even bending deformation during laying. During service, deep-water high pressure, swells, strong bottom currents, seabed movements, etc. will also cause large plastic deformations. These complex The working conditions of deepwater pipelines put forward more stringent requirements than land pipelines. Therefore, onshore pipelines are not suitable for u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B23K9/18B23K9/127B23K9/32
CPCB23P15/00B23K9/18B23K9/127B23K9/32
Inventor 王旭刘涛张红李涛赵波闵祥玲
Owner BC P INC CHINA NAT PETROLEUM CORP