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Manufacture method of X80 pipeline JCOE direct sew submerged arc welding tube

A technology of straight seam submerged arc welding and manufacturing method, which is applied to manufacturing tools, arc welding equipment, welding equipment, etc., can solve the problems of reduced strength and toughness of weld metal and heat-affected zone, and reduce or eliminate quality defects, The effect of small welding current and reduced heat-affected zone

Active Publication Date: 2008-06-25
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

At present, although some foreign companies have developed X80 steel pipes, there is no similar report on the use of JCOE to produce HTP X80 material, diameter Φ1219mm, thickness greater than 22mm, high strength and high toughness LSAW pipe
In addition, in the manufacturing process of high-strength welded pipes, the most difficult thing to solve is the reduction of the strength and toughness of the weld metal and the heat-affected zone. How to control the performance of the weld seam is the key problem that needs to be solved urgently in the development of high-strength welded pipes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Adopt HTP X80 controlled rolling steel plate with a thickness of 33mm, its chemical composition (mass percentage) is: C 0.03%, Si 0.20%, Mn 1.65%, P≤0.005%, S≤0.003%, Nb 0.09%, Cr 0.03%, Nb+Ti 0.12%, Ni+Cr+Cu 0.67%, N 0.03%, its carbon equivalent Ceq is 0.42, and the cold cracking coefficient Pcm is 0.17.

[0035] 2. Edge milling and groove processing; for a steel plate with a thickness of 33mm, the groove size is: the angle of the upper and lower grooves is 30°, the blunt edge is 9.5mm, and the depth of the downward groove is 12.5mm.

[0036] 3. Pre-bend the edge, 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.

[0037] 4. JCO forming, on the JCO forming machine, first half of the pre-bent steel plate is pressed into a "J" shape through 19 steps of step-by-step stamping, and then the other half of the steel plate is also bent...

Embodiment 2

[0060] 1. The controlled-rolled steel plate of HTP X80 with a thickness of 26.4mm is adopted, and its chemical composition (mass percentage) is: C 0.03%, Si 0.20%, Mn 1.65%, P≤0.005%, S≤0.003%, Nb 0.09%, Cr0.03%, Nb+Ti 0.11%, Ni+Cr+Cu 0.67%, N 0.03%, its carbon equivalent Ceq is 0.41, and the cold cracking coefficient Pcm is 0.16.

[0061] 2. Edge milling and groove processing; for a steel plate with a thickness of 26.4mm, the groove size is: the angle of the upper and lower grooves is 35°, the blunt edge is 8mm, and the depth of the downward groove is 10mm.

[0062] 3. Pre-bending, same as embodiment 1.

[0063] 4. JCO forming, on the JCO forming machine, first half of the pre-bent steel plate is pressed into a "J" shape through 15 step-by-step stampings, and then the other half of the steel plate is also bent into a "C" shape, and finally on the steel plate The middle of the center is punched once to form an open "O" shape. The entire pressing process adopts 31-pass deform...

Embodiment 3

[0078] 1. The use of HTP X80 controlled rolling steel plate with a thickness of 22mm, its chemical composition (mass percentage) is: C 0.02%, Si 0.20%, Mn 1.65%, P≤0.005%, S≤0.003%, Nb 0.09%, Cr0.03%, Nb+Ti 0.10%, Ni+Cr+Cu 0.67%, N 0.03%, its carbon equivalent Ceq is 0.40, and the cold cracking coefficient Pcm is 0.15. Yield strength Rt of steel plate 0.5 It is 570-595MPa, the tensile strength Rm is 700-720MPa, and the elongation is 44-45%.

[0079] 2. Edge milling and groove processing; for a steel plate with a thickness of 22mm, the groove size is: the angle of the upper and lower grooves is 40°, the blunt edge is 4mm, and the depth of the downward groove is 8mm.

[0080] 3. Pre-bending, same as embodiment 1.

[0081] 4. JCO forming. On the JCO forming machine, half of the pre-bent steel plate is stamped 11 times to form a "J" shape, and then the other half of the steel plate is also bent to form a "C" shape. The middle stamping of the C" shape once makes the steel plate ...

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Abstract

The invention discloses a method for producing a JCOE longitudinal submerged arc welded pipe of an X80 pipeline steel. The invention is used for producing an oil and gas conveying tube with high intensity and high tenacity. The method includes using an HTP X80 controlled rolling steel pipe with a chemical composition of 0.03 to 0.05 percent of C, 0.20 to 0.30 percent of Si, 1.65 to 1.75 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.005 percent of S, 0.10 to 0.15 percent of Nb plus Ti and 0.5 to 0.7 percent of Ni plus Cr plus Cu. A steel plate is made into the oil and gas conveying tube with high intensity and high tenacity through the working procedures like edge milling, edge bending, a 'JCO' forming technique under multi-pass pressing, gas protection prewelding, inside welding, outside welding, diameter enlarging, ultrasonic checking, x-ray checking, hydraulic pressure testing, tube end to arris, ultrasonic checking and X-ray checking, etc. The inside welding and the outside welding of a steel tube adopt four-wire serial union melt welding and control the technical parameters of welding through selecting a suitable welding wire and a welding fluid; thereby controlling the components and organizations of a weld joint to lead the performance of the weld joint to reach the performance requirements of X80.

Description

technical field [0001] The invention relates to a manufacturing technology of a high-strength and high-toughness longitudinal submerged arc welded pipe, in particular to a JCO forming and multi-wire welding technology of HTP X80 pipeline steel with a size of Φ1219 mm for transporting oil and gas. Background technique [0002] Road transportation is the most reasonable transportation method for long-distance transportation of oil and gas, with remarkable characteristics such as economy, safety, high efficiency, energy saving, uninterrupted, and less damage to the environment. Therefore, all countries in the world attach great importance to the development of pipeline transportation technology, and many countries spare no effort to spend a lot of financial and material resources to vigorously develop the pipeline transportation industry. Pipeline transportation has become the fifth largest transportation industry after road, railway, waterway and air ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/08B23K9/18B23K9/095B21D5/00C22C38/58
Inventor 王晓香李延丰任景辉张远生张雷王刚陈小伟郭振其张涵
Owner BC P INC CHINA NAT PETROLEUM CORP
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