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Method for manufacturing high-strength X100 steel grade spiral seam 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., and can solve problems such as insufficient deformation, pouting, internal tightness and external looseness of forming seams, and improve accuracy and reliability , increase the diameter expansion process, optimize the effect of the molding process

Active Publication Date: 2010-08-11
NORTH CHINA GASOLINEEUM STEEL PIPE +3
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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 production process. Defects can even cause fatal defects such as weld micro-cracks; problems such as crescent bends in the coil itself significantly affect the forming stability of the steel pipe, making the circumference and ellipticity of the steel pipe change greatly, and the shape of the steel pipe cannot be effectively guaranteed. Dimensional stability has a certain impact on the on-site butt joint construction of steel pipes; in addition, as the strength of steel increases, the welding process becomes more difficult. How to control the structure and performance of welded joints is also a key problem that needs to be solved

Method used

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  • Method for manufacturing high-strength X100 steel grade spiral seam submerged arc welded pipe
  • Method for manufacturing high-strength X100 steel grade spiral seam submerged arc welded pipe
  • Method for manufacturing high-strength X100 steel grade spiral seam submerged arc welded pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The main chemical composition of the plate coil used for the high-strength X100 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 this high-strength X100 steel grade spiral seam submerged arc welded pipe are as follows:

[0016] 1. The coil is uncoiled and leveled;

[0017] 2. Edge milling: first rough milling, milling off the width of the plate edge by 10-20mm; then fine milling X-shaped groove, that is, the two butt-joint edges of the steel plate coil are cut out with a blunt edge size of 8mm and a groove angle of 35° ° groove, the two sides of the steel plate are butted to form a 70° X-shaped groove;

[0018] 3. Pre-bending: pre-bend the delivery side and free side of the coiled plate on the bending machine, so that the radius size is 1470mm; the length ...

Embodiment 2

[0039] The main chemical composition and mechanical properties of the X100 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 X100 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 X100 steel grade spiral seam submerged arc welded pipe.

[0040] Table 6 Main chemical composition of coils (wt.%)

[0041] C

mn

Si

P

S

V+Nb

Ni+Cr

Cr+Mo

CE IIW

CEpcm

...

Embodiment 3

[0052] The main chemical composition and mechanical properties of the X100 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 X100 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 X100 steel grade pipeline steel pipe.

[0053] Table 11 Main chemical composition of coils (wt.%)

[0054]

C

mn

Si

P

S

V+Nb

+Ti

Ni+Cr

+Cu

Cr+Mo

+Mn

CE IIW

...

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Abstract

The invention discloses a method for manufacturing a high-strength X100 steel grade spiral seam submerged arc welded pipe. The method comprises the following steps: uncoiling, flattening, edge milling, pre-springing, molding, inside welding, outside welding, pipe end belling, base metal layering ultrasonic examination, weld seam X ray inspection, hydrostatic test, weld seam ultrasonic inspection, pipe end chamfering and finished product inspection. In the technical steps of the preparation method, double edge milling process, pre-springing process and pipe end belling process are added so as to successfully solve the technical problems that the high-strength X100 steel grade spiral seam submerged arc welded pipe has poor molding stability, the welding joint performance cannot meet technical requirement and the like.

Description

technical field [0001] The invention relates to a spiral seam submerged arc welded pipe and its manufacturing technology, in particular to a manufacturing method of a high-strength X100 steel grade spiral seam submerged arc welded pipe. Background technique [0002] The spiral submerged arc welded pipe is made by helically bending the 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 the spiral seam submerged arc welded pipe has the advantages of low investment and many types of production, 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. W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/08B23K9/18B23K9/032B23K9/095B23K9/235B23C3/12B23K9/127B21D41/02B21D5/00
Inventor 李延丰赵迪申立群李永东韩秀林宫少涛黄健刘建辉李洋郑中张永青张伟卫王庆国李健一王海生
Owner NORTH CHINA GASOLINEEUM STEEL PIPE
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