Manufacturing method of X65 pipeline steel longitudinal submerged arc welded pipe for undersea use

A technology of straight seam submerged arc and manufacturing method, applied in manufacturing tools, arc welding equipment, welding equipment, etc., can solve problems such as destructive damage and leakage of production environment in sea areas, and achieve the effect of ensuring performance, uniform performance and uniform deformation

Active Publication Date: 2012-01-11
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The operation and maintenance environment of submarine pipelines is very different from that on land. Firstly, during the pipeline laying process, the pipeline needs to bear a large deformation; secondly, the submarine pipeline is in a state of motion at any time due to the influ

Method used

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  • Manufacturing method of X65 pipeline steel longitudinal submerged arc welded pipe for undersea use
  • Manufacturing method of X65 pipeline steel longitudinal submerged arc welded pipe for undersea use
  • Manufacturing method of X65 pipeline steel longitudinal submerged arc welded pipe for undersea use

Examples

Experimental program
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Effect test

Example Embodiment

[0032] Example 1

[0033] The pipe diameter is Φ762, the wall thickness is 28.6mm, the chemical composition is C 0.06%, Mn 1.61%, Si 0.19%, S 0.0012%, P 0.007%, Mo ≤0.098%, Ni+Cr+Cu 0.157%, V+ Nb+Ti 0.062%, N 0.005%, Ceq 0.36, Pcm 0.15 X65 controlled-rolled steel plate is used to manufacture LSAW pipes. The manufacturing process is as follows:

[0034] Milling: After milling, the steel plate conforms to the upper and lower bevel angle of 35°, and the height of the blunt edge is 9mm.

[0035] Pre-bending: Use a pre-bending machine to pre-bend the edge of the plate, and make the edge of the plate have the required curvature according to the requirements of the pipe diameter.

[0036] JCO forming: adopts the method of gradual pressing, the steel plate is fed by 134mm each time, first half of the steel plate is pressed into a "J" shape after 7 times, and the other half is pressed in the same way to form a "C" shape. Press in the middle to make the entire steel plate pressed into an open ...

Example Embodiment

[0060] Example 2

[0061] The pipe diameter is Φ762, the wall thickness is 30.2mm, the chemical composition is C 0.07%, Mn 1.58%, Si 0.31%, S 0.001%, P 0.007%, Mo ≤0.014%, Ni+Cr+Cu 0.216%, V+ X65 controlled-rolled steel plates with Nb+Ti 0.046%, N 0.004%, Ceq 0.40, Pcm 0.18 are used to manufacture LSAW pipes. The manufacturing process is as follows:

[0062] Milling: After milling, the steel plate meets the upper and lower bevel angle of 35°, and the height of the blunt edge is 9.0mm.

[0063] Pre-bending: Use a pre-bending machine to pre-bend the edge of the plate, and make the edge of the plate have the required curvature according to the requirements of the pipe diameter.

[0064] JCO forming: adopts the method of gradual pressing, the steel plate is fed by 134mm each time, first half of the steel plate is pressed into a "J" shape after 7 times, and the other half is pressed in the same way to form a "C" shape. Press in the middle to make the entire steel plate pressed into an ope...

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Abstract

The invention discloses a manufacturing method of an X65 pipeline steel longitudinal submerged arc welded pipe for undersea use. The manufacturing process of the steel pipe comprises: edge milling, edge prebending, JCO moulding, prewelding, inside welding, outside welding, first ultrasonic inspection, first x-ray inspection, mechanical expanding, hydrostatic test, chamfering, groove machining, second ultrasonic inspection, second x-ray inspection, pipe end magnetic particle inspection and appearance quality inspection. The method of the invention makes each part of the X65 steel grade ongitudinal submerged arc welded pipe with a diameter of phi 762mm and wall thickness of 28.6-30.2mm has uniform deformation and performances in the process of JCO moulding; the method in the invention solves the problem that local heating of the steel pipe during welding results in severely reduced strength and toughness as well as elongation; the method provided in the invention also provides a solution to the problems of increased strength and reduced toughness and uniform elongation caused by work hardening during steel pipe mechanical expanding.

Description

technical field [0001] The invention relates to a method for manufacturing submerged arc welded pipes, in particular to a method for manufacturing X65 pipeline steel straight seam submerged arc welded pipes for seabeds. Background technique [0002] At present, more than 2,000 offshore oil and gas fields have been discovered in the world. Offshore oil and gas reserves have accounted for 30-40% of global reserves, and production has reached more than 30%. Offshore oil and gas has become the main source of world oil production growth. my country is rich in offshore oil resources, with estimated oil resources of more than 24 billion tons and natural gas resources of 8 trillion cubic meters. my country's future oil production growth will mainly come from the sea. [0003] The operation and maintenance environment of submarine pipelines is very different from that on land. Firstly, during the pipeline laying process, the pipeline needs to bear a lot of deformation; secondly, the...

Claims

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Application Information

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IPC IPC(8): B21C37/08B23K9/18
Inventor 付彦宏任景辉陈小伟李志华郭振其曹华勇刘丽伟王东超
Owner BC P INC CHINA NAT PETROLEUM CORP
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