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Postweld stabilizing thermal treatment method for pipeline made of TP347 material

A technology for stabilizing heat treatment and piping, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve problems such as severe cracks and weld cracks, achieve long holding time, release residual stress, and improve weld quality.

Active Publication Date: 2017-01-11
THE SIXTH CONSTR CO LTD OF CHINA NAT CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the construction process, after the welds of TP347 material pipes undergo stabilization heat treatment, cracks appear in some welds, and the cracks become more serious as the wall thickness increases.

Method used

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  • Postweld stabilizing thermal treatment method for pipeline made of TP347 material

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Experimental program
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Effect test

Embodiment 1

[0030] A post-weld stabilization heat treatment method for TP347 material pipelines:

[0031] Before the stabilization heat treatment, the TP347 material pipe is subjected to post-weld pretreatment, including: the two ends of the TP347 material pipe opposite to the weld are continuously injected with a volume fraction of 92% N 2 and 8% CO 2 The protective gas formed is used to heat the weld seam at the same time. When the temperature reaches 400°C, stop heating, keep it for 2 hours, and then cool it to 100°C. After 5 cycles, use ultrasonic impact equipment to process the weld seam, and finally treat the TP347 material pipe Infrared radiation 4h;

[0032] Among them, the flow rate of the shielding gas is 20L / min, and the range of heating the weld is controlled at 100mm from each side of the weld. When heating, the temperature rises to 400°C at a rate of 40°C / h, and when cooling, the temperature is raised to 400°C at a rate of 15°C / h. The cooling rate is reduced from 400°C to ...

Embodiment 2

[0044] A post-weld stabilization heat treatment method for TP347 material pipelines:

[0045] Before the stabilization heat treatment, the TP347 material pipe is subjected to post-weld pretreatment, including: the two ends of the TP347 material pipe opposite to the weld are continuously injected with a volume fraction of 92% N 2 and 8% CO 2 The protective gas formed is used to heat the weld at the same time. When the temperature reaches 400°C, stop heating, keep it for 2.5 hours, and then cool to 100°C. After 6 cycles, use ultrasonic impact equipment to process the weld, and finally the TP347 material pipe Carry out infrared radiation for 4.5h;

[0046] Among them, the flow rate of the shielding gas is 20L / min, and the range of heating the weld is controlled at 150mm from each side of the weld. When heating, the temperature rises to 400°C at a rate of 40°C / h, and when cooling, the temperature is raised to 400°C at a rate of 15°C / h. The cooling rate is reduced from 400°C to 1...

Embodiment 3

[0059] A post-weld stabilization heat treatment method for TP347 material pipelines:

[0060] Before the stabilization heat treatment, the TP347 material pipe is subjected to post-weld pretreatment, including: the two ends of the TP347 material pipe opposite to the weld are continuously injected with a volume fraction of 92% N 2 and 8% CO 2 The protective gas formed is used to heat the weld seam at the same time. When the temperature reaches 400°C, stop the heating, keep it for 3 hours, and then cool it to 100°C. After 8 cycles, use ultrasonic impact equipment to treat the weld seam, and finally the TP347 material pipe Infrared radiation 5h;

[0061] Among them, the flow rate of the shielding gas is 20L / min, and the range of heating the weld is controlled at 200mm from each side of the weld. When heating, the temperature rises to 400°C at a rate of 40°C / h, and when cooling, the temperature is raised to 400°C at a rate of 15°C / h. The cooling rate is reduced from 400°C to 100°...

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Abstract

The invention discloses a postweld stabilizing thermal treatment method for a pipeline made of a TP347 material, and the postweld stabilizing thermal treatment method is used for carrying out postweld pretreatment on the pipeline made of the TP347 material before stabilizing thermal treatment. The postweld stabilizing thermal treatment method comprises the following steps: continuously introducing protective gas comprising 92% (in volume fraction) of N2 and 8% of CO2 to the two ends of the pipeline made of the TP347 material opposite to a welding seam separately; heating the welding seam, stopping heating when the temperature is 400 DEG C, keeping the temperature at 400 DEG C for 2-3 hours, reducing the temperature to 100 DEG C, and treating the welding seam by use of ultrasonic impact equipment after circulating for 5-8 times; and finally, carrying out infrared radiation for 4-5 hours on the pipeline made of the TP347 material. According to the postweld stabilizing thermal treatment method disclosed by the invention, stabilizing thermal treatment is carried out after pretreatment; the pipeline made of the TP347 material comprises stabilizing elements, namely niobium, titanium, yttrium and zirconium; and the method disclosed by the invention is adopted, so that welding seam cracks are effectively eliminated, and therefore, welding seam quality is improved.

Description

technical field [0001] The invention relates to a post-welding stabilization heat treatment process. Specifically, the invention relates to a post-weld stabilization heat treatment method for a TP347 material pipeline. Background technique [0002] Both domestic and foreign oil refining industries are faced with the situation of processing high-sulfur, heavy and low-quality crude oil, and the current domestic oil refining projects and technology have become saturated, and the utilization efficiency of oil refining and coking by-products such as residual oil and coal tar is too low. Therefore, The development of hydrogenation technology is one of the important measures to meet this challenge. This technology will change the current situation of domestic oil refining, and can reuse various low value-added products such as residual oil and coal tar. Hydrogenation technology will be the last piece of virgin land in the oil refining industry, and whoever masters this constructio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/50C21D1/74C21D10/00
CPCC21D1/74C21D9/50C21D10/00
Inventor 赵青姚永泽丁秋华胡舒畅郑海波
Owner THE SIXTH CONSTR CO LTD OF CHINA NAT CHEM ENG
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