Method for manufacturing high-strength X90 steel grade spiral submerged arc welded pipe

A technology of submerged arc welded pipe and manufacturing method, which is applied in the direction of manufacturing tools, arc welding equipment, welding equipment, etc., can solve problems such as insufficient deformation, difficult welding process, tight inner and outer loose forming seams, and improve accuracy and reliability High efficiency, convenient on-site construction operations, and optimized molding process

Active Publication Date: 2010-11-17
CNPC BOHAI EQUIP MFG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current production method still has many problems in the production of high-strength spiral submerged arc welded pipes. The main manifestations are: as the strength of the steel increases, the deformation of the steel strip in the former, especially the edge of the strip on the delivery side, is insufficient. At the same time, the edge trimming process commonly used at present will also cause the under-flange phenomenon of the plate edge. If it is not corrected in the subsequent process, pouting, tightness inside the forming seam and looseness outside the forming seam, wrong edge, etc. will easily occur during the produ

Method used

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  • Method for manufacturing high-strength X90 steel grade spiral submerged arc welded pipe
  • Method for manufacturing high-strength X90 steel grade spiral submerged arc welded pipe
  • Method for manufacturing high-strength X90 steel grade spiral submerged arc welded pipe

Examples

Experimental program
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Effect test

Embodiment 1

[0017] The main chemical composition of the plate coil used in the high-strength X90 steel grade spiral submerged arc welded pipe in this example is shown in Table 1, and the mechanical properties are shown in Table 2. The thickness of the steel plate is 15.3mm, and the outer diameter of the steel pipe is Φ1016mm. The manufacturing process steps of the high-strength X90 steel grade spiral seam submerged arc welded pipe are as follows:

[0018] 1. The coil is uncoiled and leveled;

[0019] 2. Edge milling: rough milling first, milling off the width of the plate edge by 10-20mm to ensure the removal of plate edge defects and crescent bends caused by the steel billet and the rolling process; The two butt plate edges are grooved with a blunt edge size of 8mm and a groove angle of 35°. After the two sides of the steel plate are butted, an X-shaped groove of 70° is formed; the purpose of the groove is to ensure that the coil It can penetrate through the welding process, increase th...

Embodiment 2

[0041] The main chemical composition and mechanical properties of the X90 steel grade coils used in the submerged arc welded pipes of this embodiment are shown in Table 6 and Table 7. The manufacturing process steps of the submerged arc welded pipe are the same as those in Example 1, and the process parameters during welding are shown in Table 8. Table 9 shows the main chemical composition of the weld metal in this example, and Table 10 shows the main performance test results of the actual submerged arc welded pipe and the main performance requirements of the X90 steel grade spiral seam submerged arc welded pipe. It can be seen that the submerged arc welded pipe manufactured by the technology of the present invention meets the technical requirements of the X90 steel grade spiral seam submerged arc welded pipe.

[0042] Table 6 Main chemical composition of coils (wt.%)

[0043] C

mn

Si

P

S

V+Nb+Ti

Ni+Cr+Cu

Cr+Mo+Mn

CE IIW

CEpcm...

Embodiment 3

[0053] The main chemical composition and mechanical properties of the X90 steel coil used in this example are shown in Table 11 and Table 12. The manufacturing process steps of the submerged arc welded pipe are the same as those in Example 1, and the process parameters during welding are shown in Table 13. Table 14 shows the main chemical composition of the weld metal in this example, and Table 15 shows the main performance test results of the actual submerged arc welded pipe and the main performance requirements of the X90 steel grade pipeline steel pipe. It can be seen from the table that using The submerged arc welded pipe manufactured by the technology of the invention meets the technical requirements of the X90 grade pipeline steel pipe.

[0054] Table 11 Main chemical composition of coils (wt.%)

[0055] C

mn

Si

P

S

V+Nb+Ti

Ni+Cr+Cu

Cr+Mo+Mn

CE IIW

CEpcm

0.052

1.95

0.24

0.010

0.0015

0.12...

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Abstract

The invention discloses a method for manufacturing a high-strength X90 steel grade spiral submerged arc welded pipe. The method comprises the following steps of: uncoiling; leveling; edge milling; pre-springing; forming; inside welding; outside welding; pipe end diameter expansion; layering and ultrasonic examination of a base material; X-ray examination of a welding seam; hydrostatic test; ultrasonic examination of the welding seam; and pipe end chamfering. By increasing the processes of double edge milling, edge pre-springing and pipe end diameter expansion in the processing steps, the manufacturing method successfully solves the technical problems of poor forming stability, the difficulty for the performance of the welded joint to meet the technical requirement and the like during the manufacturing of the high-strength X90 steel grade spiral submerged arc welded pipe.

Description

technical field [0001] The invention relates to a manufacturing technology of a spiral seam submerged arc welded pipe, in particular to a manufacturing method of a high-strength X90 steel grade spiral seam submerged arc welded pipe. Background technique [0002] The spiral seam submerged arc welded pipe is made by spirally bending steel coils according to a certain radius of curvature and then welding them together along the gap between the butt joints of the steel plates. Because spiral seam submerged arc welded pipe has the advantages of low investment and various production varieties, it has become the most widely used steel pipe manufacturing method in China. However, due to the limitations of its forming method and the relatively low strength of steel pipes for a long time, there are few productions of high-strength steel pipes. At present, the steel used in the steel pipe produced by the spiral seam submerged arc welded pipe does not exceed the X80 steel grade. [00...

Claims

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Application Information

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IPC IPC(8): C22C38/14B21C37/12B23K9/18B23K101/06B23K103/04
Inventor 李延丰申立群吉玲康田鹏宫少涛张小东李洋李健一张伟卫
Owner CNPC BOHAI EQUIP MFG
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