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Manufacturing method of X70 large-deformation steel fire-bent pipe

A technology of hot-simmering pipe bending and manufacturing process, which is applied in the field of metal pipe processing and piping systems, and can solve the problem that the deformation capacity of the bending pipe cannot meet the safety requirements of the pipeline, the longitudinal tensile stress ratio, the uniform elongation decrease, and no reflection Problems such as the key indicators of the bent pipe, to achieve good longitudinal deformation ability, improved strength and toughness, and uniform performance

Inactive Publication Date: 2013-05-08
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

However, none of these patents considered the deformation ability of the elbow, nor did they mention the key indicators reflecting the longitudinal deformation ability of the elbow, such as the longitudinal tensile stress ratio, uniform elongation, and the shape of the stress-strain curve, etc.
Using these methods to make hot-simmered bent pipes will cause essential changes in the structure of the parent pipe obtained through advanced technologies such as controlled rolling and controlled cooling. Although the strength and toughness that meet the engineering technical requirements can be obtained in the end, the longitudinal tensile stress ratio and uniformity The elongation rate and other indicators are significantly reduced, so that the deformation capacity of the bent pipe cannot meet the safety requirements of the pipeline in special sections with strain design

Method used

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  • Manufacturing method of X70 large-deformation steel fire-bent pipe
  • Manufacturing method of X70 large-deformation steel fire-bent pipe
  • Manufacturing method of X70 large-deformation steel fire-bent pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1. This example is to make a pipe diameter of 813mm and a wall thickness of 14mm X70 large deformation steel hot-bending pipe. The parent pipe used is a straight seam submerged arc welded steel pipe made of controlled rolling and controlled cooling steel plate. The weight percent of its composition is: C: 0.07%; Mn: 1.65%; Si: 0.21%; P: 0.010%; S: 0.004%; Nb: 0.05%; Ti: 0.02%; 0.01%; Cr: 0.12%; Mo: 0.15%; Cu: 0.16%; Ni: 0.22%; N: 0.006%; carbon equivalent Ceq: 0.43%; cold cracking coefficient Pcm: 0.19%;

[0015] Firstly, the parent tube with the above components is subjected to intermediate frequency induction heating and bending, and the overall heating and quenching bending process is used to make a 90° bend, and the bending radius is 6 times the diameter of the parent tube. Induction heating temperature is 950-1000°C, propulsion speed is 65-70mm / min, external water spray cooling, cooling speed is 20-30°C / s;

[0016] Then put the bent pipe into a heating...

Embodiment 2

[0020] Embodiment 2. This example is to make a pipe diameter of 1016mm and a wall thickness of 21mm X70 large deformation steel hot-bending pipe. The parent pipe used is a straight seam submerged arc welded steel pipe made of controlled rolling and controlled cooling steel plate. The weight percent of its composition is: C: 0.05%; Mn: 1.68%; Si: 0.15%; P: 0.005%; S: 0.002%; Nb: 0.022%; Ti: 0.013%; 0.002%; Cr: 0.014%; Mo: 0.25%; Cu: 0.22%; Ni: 0.26%; N: 0.002%; carbon equivalent Ceq: 0.42%; Pcm: 0.18%;

[0021] Firstly, the parent tube with the above components is subjected to intermediate frequency induction heating and bending, and the overall heating and quenching bending process is used to make a 45° bend, and the bending radius is 6 times the diameter of the parent tube. Induction heating temperature is 1000~1050℃, propulsion speed is 45~50mm / min, external water spray cooling, cooling speed is 20~30℃ / s;

[0022] Then put the bent pipe into a heating furnace for overall h...

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Abstract

The invention discloses a manufacturing method of an X70 large-deformation steel fire-bent pipe. The manufacturing method comprises the following steps of 1, utilizing a straight seam submerged-arc welding steel pipe made by steel plate controlled-rolling and controlled-cooling as a base pipe, 2, carrying out medium-frequency induction heating bending of the main pipe by an integral heating quenching bending technology under the conditions of an induction heating temperature of 950 to 1050 DEG C and a feeding rate of 40 to 80mm / min, and cooling at a cooling rate greater than or equal to20DEG C / s by an external spray cooling method, and 3, putting the fire-bent pipe obtained by the step 2 into a heating furnace, carrying out integral heating at a temperature of 700 to 850 DEG C, carrying out heat preservation for 1.0 to 2.0 hours, carrying out quenching, and carrying out integral tempering under the conditions of a tempering temperature of 350 to 550 DEG C and tempering heat preservation time of 1.5 to 2.5 hours. The X70 large-deformation steel fire-bent pipe obtained by the manufacturing method has bent pipe strength and toughness satisfying X70 standard requirements, a high longitudinal tensile stress ratio, a high uniform elongation percentage, and a good longitudinal deformation capability.

Description

technical field [0001] The invention relates to a manufacturing process for an X70 large-deformation steel hot-simmer bend used for laying in strain-designated areas of long-distance oil and gas pipelines. It relates to the technical field of processing of metal pipes and piping systems. Background technique [0002] At present, the commonly used production methods for hot-simmered elbows are: partial quenching (only the bending section is quenched) plus tempering, overall quenching and tempering, partial quenching without tempering, and overall quenching without tempering. Among them, the local quenching and tempering process is the most widely used, which is beneficial to eliminate the residual stress caused by the bending process, and the overall quality of the bent pipe produced is relatively stable, and the low temperature toughness is good. However, the use of this process will cause a heating temperature transition zone between the curved section and the straight pip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/50C21D9/08C21D1/18
Inventor 刘宇冯斌白世武李玉卓李桂芝王永胜赵玉朋李烨铮孙旭辉袁欣然
Owner BC P INC CHINA NAT PETROLEUM CORP
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