A manufacturing method of x90 grade pipeline steel large-diameter thick-walled straight seam submerged arc welded pipe

A technology of straight seam submerged arc welding and manufacturing method, used in manufacturing tools, arc welding equipment, welding equipment, etc., can solve the problems of strength and toughness matching of welded joints, uneven forming, and decline in mechanical properties of pipe bodies, and achieve guaranteed strength. and toughness, low weld susceptibility coefficient values, high uniform elongation of the body

Active Publication Date: 2016-08-31
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide a method for manufacturing X90-grade pipeline steel large-diameter thick-walled longitudinal submerged arc welded pipes, which solves the problem of uneven forming of thick-walled longitudinally welded pipes during the forming process. The problem of serious decline in physical mechanical properties and the matching of strength and toughness of welded joints provide a reference for the industrial application of X90 large-diameter thick-walled welded pipes in my country

Method used

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  • A manufacturing method of x90 grade pipeline steel large-diameter thick-walled straight seam submerged arc welded pipe
  • A manufacturing method of x90 grade pipeline steel large-diameter thick-walled straight seam submerged arc welded pipe
  • A manufacturing method of x90 grade pipeline steel large-diameter thick-walled straight seam submerged arc welded pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Manufacture of X90Φ1219×24.2mm straight seam welded pipe

[0029] (1) Raw material, using X90 steel plate with a wall thickness of 24.2mm, its main alloy element content: C 0.09%, Si 0.28%, Mn 1.83%, S 0.001%, P 0.008%, Ni 0.42%, Cr 0.03%, Cu 0.16%, Nb 0.049%, V 0.025%, Ti 0.015%, Mo 0.39%, Al 0.032%, N 0.008%, B 0.0005%, the balance is Fe, and the carbon equivalent is CE (Pcm) is 0.22.

[0030] (2) Ultrasonic inspection of steel plates, 100% ultrasonic testing of steel plates.

[0031] (3) For edge milling, the groove size is 38° for the upward groove, 40° for the downward groove, the depth of the downward groove is 9.0mm, and the blunt edge is 8.0mm.

[0032] (4) Pre-bending, use the pre-bending machine to pre-bend the edge of the plate, so that the curvature of the edge of the plate meets the requirements.

[0033] (5) JCO forming, first press one side of the pre-bent steel plate 10 times on the forming machine to form a "J" shape, and then press the ot...

Embodiment 2

[0058] Example 2: Manufacture of X90Φ1219×26.4mm straight seam welded pipe

[0059] (1) Raw material, using X90 steel plate with a wall thickness of 26.4mm, its main alloy element content: C 0.09%, Si 0.28%, Mn 1.83%, S 0.001%, P 0.008%, Ni 0.42%, Cr 0.03%, Cu 0.16%, Nb 0.049%, V 0.025%, Ti 0.015%, Mo 0.39%, Al 0.032%, N 0.008%, B 0.0005%, the balance is Fe, and the carbon equivalent is CE (Pcm) is 0.22.

[0060] (2) Ultrasonic inspection of steel plates, 100% ultrasonic testing of steel plates.

[0061] (3) For edge milling, the groove size is 35° for the upward groove, 35° for the downward groove, 10.0mm depth for the downward groove, and 9.0mm for the blunt edge.

[0062] (4) Pre-bending, use the pre-bending machine to pre-bend the edge of the plate, so that the curvature of the edge of the plate meets the requirements.

[0063] (5) JCO forming, first press one side of the pre-bent steel plate 10 times on the forming machine to form a "J" shape, and then press the other ...

specific Embodiment 3

[0087] Specific implementation example 3: X90Φ1219×30.4mm straight seam welded pipe manufacturing

[0088] (1) Raw material, using X90 steel plate with a wall thickness of 26.4mm, its main alloy element content: C 0.09%, Si 0.28%, Mn 1.83%, S 0.001%, P 0.008%, Ni 0.42%, Cr 0.03%, Cu 0.16%, Nb 0.049%, V 0.025%, Ti 0.015%, Mo 0.39%, Al 0.032%, N 0.008%, B 0.0005%, the balance is Fe, and the carbon equivalent is CE (Pcm) is 0.22.

[0089] (2) Ultrasonic inspection of steel plates, 100% ultrasonic testing of steel plates.

[0090] (3) Edge milling, the groove size is 35° for the upper groove, 35° for the lower groove, 11.5mm for the lower groove depth, and 11.0mm for the blunt edge.

[0091] (4) Pre-bending, use the pre-bending machine to pre-bend the edge of the plate, so that the curvature of the edge of the plate meets the requirements.

[0092] (5) JCO forming, first press one side of the pre-bent steel plate 10 times on the forming machine to form a "J" shape, and then pre...

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Abstract

The invention discloses a method for manufacturing an X90 grade pipeline steel large-diameter thick-walled straight seam submerged arc welded pipe. This method can be used to complete the manufacture of X90 grade Φ1219×24.2-30.4mm large-diameter thick-walled longitudinal submerged arc welded pipe. After the pipe is made, the LSAW pipe not only has good mechanical properties, but also has a high uniform elongation of the pipe body, and at the same time realizes the matching of strength and toughness of the welded joint of the welded pipe. The X90 grade pipeline steel large-diameter thick-walled longitudinal submerged arc welded pipe manufactured by the method of the invention not only realizes the matching of strength and toughness of the welded joint, but also has excellent performance of the pipe body, high uniform elongation of the pipe body, and precise geometric dimensions of the welded pipe.

Description

Technical field: [0001] The invention belongs to the petroleum field and relates to a method for manufacturing a welded pipe, in particular to a method for manufacturing an X90 grade pipeline steel large-diameter thick-walled straight seam submerged arc welded pipe. Background technique: [0002] Pipeline transportation is the most economical, safe and reasonable transportation method for long-distance oil and gas transportation. It has become the main way of land oil and gas transportation, and it is developing vigorously both at home and abroad. The development trend of pipeline construction is to develop in the direction of long distance, high pressure and large diameter. [0003] The size of the pipeline transportation capacity is closely related to the strength level and wall thickness of the pipe material. In order to transport oil and gas to the destination more safely and economically, the strength level and wall thickness of welded pipes used in long-distance pipeli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/08C22C38/54B23K9/16B23K9/18
Inventor 毕宗岳刘斌牛辉张锦刚刘海璋陈长青包志刚张万鹏赵红波黄晓辉牛爱军张君杨军杨耀彬刘刚伟
Owner BC P INC CHINA NAT PETROLEUM CORP
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