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A method for manufacturing super-large diameter thick-walled x80 steel grade spiral submerged arc welded pipe

A technology of submerged arc welded pipes and manufacturing methods, which is applied in the direction of pipes/pipe joints/fittings, pipes, rigid pipes, etc., which can solve the problems such as difficulty in ensuring the quality of weld seams of X80 steel grade steel pipes, and achieve the overall quality level and reduce residual stress , the effect of reducing the amount of filling

Active Publication Date: 2020-02-14
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

[0006] In order to solve the problem that the weld seam quality of X80 steel grade steel pipe is difficult to guarantee with the increase of steel wall thickness and pipe diameter, the embodiment of the present invention provides a method for manufacturing super large pipe diameter and thick wall X80 steel grade spiral submerged arc welded pipe

Method used

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  • A method for manufacturing super-large diameter thick-walled x80 steel grade spiral submerged arc welded pipe
  • A method for manufacturing super-large diameter thick-walled x80 steel grade spiral submerged arc welded pipe
  • A method for manufacturing super-large diameter thick-walled x80 steel grade spiral submerged arc welded pipe

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Embodiment 1

[0065] The main chemical composition of the coil used for the X80 steel grade spiral submerged arc welded pipe in the embodiment of the present invention is shown in Table 1. The weight percentage of the chemical composition of the coil conforms to the American Petroleum Institute API Spec 5L: 2012 standard, and the microstructure is GB +PF (granular bainite + polygonal ferrite), the grain size is greater than or equal to grade 12, the outer diameter of the steel pipe is 1422mm, and the thickness is 21.4mm. The manufacturing process steps of the super large diameter thick wall X80 steel grade spiral submerged arc welded pipe are as follows:

[0066] 1. The coil is uncoiled and leveled;

[0067] 2. Edge milling: first rough mill the I-shaped groove, mill the edge width of the plate by 10-20mm to ensure the width of the strip, and remove the plate edge defects and crescent bends caused by the steel billet and the rolling process; then fine milling It is a double V-shaped compou...

Embodiment 2

[0097] The main chemical composition of the coil used for the X80 steel grade spiral submerged arc welded pipe in this embodiment is shown in Table 6. The weight percentage of the chemical composition of the coil conforms to the American Petroleum Institute API Spec 5L: 2012 standard, and the microstructure is GB+PF( Granular bainite + polygonal ferrite), the grain size is greater than or equal to grade 12, the thickness of the steel pipe is 22mm, and the outer diameter of the steel pipe is 1219mm. The manufacturing process steps of the super large diameter thick wall X80 steel grade spiral submerged arc welded pipe are as follows:

[0098] 1. The coil is uncoiled and leveled;

[0099] 2. Edge milling: first rough mill the I-shaped groove, and mill the edge width of the plate by 10-20mm; then finish milling to form a double V-shaped compound groove, and the angle of the outer groove surface of the upper groove is α 1 is 9°, and the angle β of the inner groove surface of the u...

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Abstract

The invention discloses a manufacturing method for an oversized-pipe-diameter thick-wall X80 steel-grade spiral submerged-arc welded pipe, and belongs to the field of spiral submerged-arc welded pipemanufacturing. The method comprises the following steps of: uncoiling, leveling, edge-milling, pre-bending, forming, pre-welding, fine-welding, tube end rounding, welding seam X-ray detecting, hydrostatic-pressure testing, base material ultrasonic automatic detecting, welding seam ultrasonic automatic detecting, ultrasonic manual detecting, mechanical end-flattening, appearance checking and anticorrosive paint coating, wherein a groove in the edge-milling process is set to be a double-V-shaped composite groove; and the fine-welding process comprises an internal-welding process and an external-welding process, which adopt three-wire serial submerged-arc automatic welding processes. The method provided by the invention can solve the technical problems that the technical requirements on welding seam quality of the oversized-pipe-diameter thick-wall X80 steel-grade spiral submerged-arc welded pipe are difficult to meet, and the like.

Description

technical field [0001] The invention relates to the technical field of spiral submerged arc welded pipe manufacturing, in particular to a method for manufacturing a super-large diameter thick-walled X80 steel grade spiral submerged arc welded pipe. Background technique [0002] With the development of the national economy and the implementation of the energy strategy, the demand for oil and natural gas continues to increase, and due to factors such as land, environmental protection, construction and operation, it is imminent to increase the single-pipeline transmission volume and develop super-large-transport pipeline projects. [0003] There are two ways to increase the transmission capacity of natural gas pipelines: one is to increase the transmission pressure, and the other is to increase the pipe diameter. Therefore, in order to increase the transmission efficiency of the pipeline, it is necessary to continuously increase the transmission pressure and pipe diameter, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
CPCB23P15/00F16L9/02
Inventor 孙志刚李建一陈楠谷海龙李斌王洋王海生崔润祥刘红军孙少卿周书亮
Owner BC P INC CHINA NAT PETROLEUM CORP
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