Manufacturing method for X90 pipeline steel longitudinal submerged arc welding pipe

A technology of straight seam submerged arc and manufacturing method, applied in the field of welded pipe manufacturing, can solve problems such as large span, and achieve the effects of increasing strength, improving strength and uniform deformation

Inactive Publication Date: 2012-04-04
CNPC BOHAI EQUIP MFG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there have been test reports on X100 welded pipes, the leap from X80 to X100 is too large, and a large number of problems cannot be solved satisfactorily. Experts still have serious concerns about the use of X100 welded pipes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Manufacturing of X90 Φ1016×18.4mm steel pipe

[0020] 1. raw material

[0021] The X90 steel plate with a wall thickness of 18.4mm is used, and its main alloy element content is:

[0022] C 0.04%, Mn 1.75%, Si 0.45%, S 0.003%, P 0.008%, Ni 0.20%, Mo 0.10%, Ti 0.013%, Al 0.015%, Nb 0.05%, V 0.002%, N 0.005%, Cu 0.30 %, Cr 0.35%, B 0.0005%, the balance is Fe, of which Ceq 0.45, Pcm 0.19.

[0023] 2. Edge milling, after edge milling, the steel plate conforms to: the angle of the upward groove is 35°, the angle of the downward groove is 40°, and the height of the blunt edge is 5.0mm.

[0024] 3. Pre-bending, use the pre-bending machine to pre-bend the edge of the plate, and make the edge of the plate have a curvature that meets the requirements according to the requirements of the pipe diameter.

[0025] 4. JCO molding adopts the method of step-by-step pressing. The steel plate is fed 166mm each time. First, half of the steel plate is pressed into a "J" sh...

Embodiment 2

[0050] Example 2: Manufacturing of X90 Φ1016×22.9mm steel pipe

[0051] 1. raw material

[0052] The X90 steel plate with a wall thickness of 22.9mm is used, and its main alloy element content is:

[0053] C 0.08%, Mn 1.75%, Si 0.25%, S 0.003%, P 0.006%, Ni 0.30%, Mo 0.12%, Ti 0.020%, Al 0.027%, Nb 0.06%, V 0.001%, N 0.005%, Cu 0.20 %, Cr 0.15%, B 0.0004%, the balance is Fe, of which Ceq 0.46, Pcm ≤0.20.

[0054] 2. Edge milling. After edge milling, the steel plate conforms to: the angle of the upward groove is 35°, the angle of the downward groove is 35°, and the height of the blunt edge is 6.0mm.

[0055] 3. Pre-bending, use the pre-bending machine to pre-bend the edge of the plate, and make the edge of the plate have a curvature that meets the requirements according to the requirements of the pipe diameter.

[0056] 4. JCO molding adopts the method of step-by-step pressing. The steel plate is fed 147mm each time. First, half of the steel plate is pressed into a "J...

Embodiment 3

[0081] Example 3: Manufacturing of X90 Φ1219×18.4mm steel pipe

[0082] 1. raw material

[0083] The X90 steel plate with a wall thickness of 18.4mm is used, and its main alloy element content is:

[0084] C 0.05%, Mn 1.60%, Si 0.15%, S 0.003%, P 0.006%, Ni 0.50%, Mo 0.30%, Ti 0.010%, Al 0.034%, Nb 0.055%, V 0.02%, N 0.003%, Cu 0.15 %, Cr 0.15%, B 0.001%, the balance is Fe, of which Ceq 0.45, Pcm ≤0.19.

[0085] 2. Edge milling, after edge milling, the steel plate conforms to: the angle of the upward groove is 35°, the angle of the downward groove is 35°, and the height of the blunt edge is 5.0mm.

[0086] 3. Pre-bending, use the pre-bending machine to pre-bend the edge of the plate, and make the edge of the plate have a curvature that meets the requirements according to the requirements of the pipe diameter.

[0087] 4. JCO molding adopts the method of step-by-step pressing. The steel plate is fed 165mm each time. First, half of the steel plate is pressed into a "J"...

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Abstract

The invention discloses a manufacturing method for X90 pipeline steel longitudinal submerged arc welding pipe, the mass percent of the X90 pipeline steel consisting of: C 0.04-0.08%, Mn1.60-2.0%, Si 0.15-0.45%, S<=0.006%, P<=0.010%, Ni 0.20-0.50%, Mo 0.10-0.30%, Ti 0.010-0.020%, Al 0.015-0.050%, Nb 0.05-0.10%, V<= 0.05%, N <= 0.01%, Cu 0.10-0.30%, Cr <= 0.35%, B <= 0.004%, the rest is Fe, wherein Ceq <= 0.50, Pcm<= 0.25; the inside welding and outside welding adopt 4-wire submerged arc automatic welding. The welding pipe of the invention has advantages of tenacious welding joints and uniform performance.

Description

technical field [0001] The invention relates to a method for manufacturing a welded pipe, in particular to a method for manufacturing an X90 pipeline steel straight seam submerged arc welded pipe. Background technique [0002] As an important energy source, oil and natural gas account for an increasing proportion in my country's energy structure, and the demand is strong. Using long-distance pipelines to transport oil and gas from production sites to users is a safe, efficient and economical method, and has become the main way of onshore oil and gas transportation. With the continuous increase of oil and gas demand for my country's economic development, my country's oil and gas pipeline network construction will usher in a new round of peaks in the next five to ten years. [0003] The ability of pipeline transportation is directly affected by the strength level. In order to transport oil and gas to the required place more economically, the strength level of welded pipes use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D37/08C22C38/16
Inventor 付彦宏陈小伟武占芳郭振其张志明钱勇李翠艳苏志
Owner CNPC BOHAI EQUIP MFG
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