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Welding and assembling thermal treatment method for martensite heat-resistant steel G115 large-diameter thick-wall pipeline

A heat treatment method and heat-resistant steel technology, applied in welding equipment, welding accessories, arc welding equipment, etc., can solve the problems of inclusions, unfused, and tungsten welding materials in the fusion zone, and improve the utilization rate of heat treatment equipment. Guarantee the quality of welding and heat treatment, and the effect of ensuring the quality of weld heat treatment

Inactive Publication Date: 2020-11-27
POWERCHINA SEPCO1 ELECTRIC POWER CONSTR CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In view of the above-mentioned problems, the present invention provides a welding and combined heat treatment method for martensitic heat-resistant steel G115 large-diameter and thick-walled pipes. After heat treatment, it solves the problems of cold and hot cracks, unfused roots, tungsten inclusions and other quality defects in the welding seam during the welding process of the new martensitic heat-resistant steel G115 large-diameter and thick-walled pipes, as well as the welding materials are easily damaged and the fusion zone is easy There is a problem of inclusion

Method used

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  • Welding and assembling thermal treatment method for martensite heat-resistant steel G115 large-diameter thick-wall pipeline
  • Welding and assembling thermal treatment method for martensite heat-resistant steel G115 large-diameter thick-wall pipeline

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no. 1 example

[0039]A martensitic heat-resistant steel G115 large-diameter thick-walled pipe welding and combined heat treatment method, taking G115 steel pipe 1 with a diameter of 530 mm and a wall thickness of 115 mm as an example, the ambient temperature for welding is not lower than 5°C, and the wind speed in the welding area is ≤ 2m / s. Specifically, the method includes the steps of:

[0040] (1) Groove preparation: according to figure 1 Process U-shaped grooves, and then pair them to form grooves.

[0041] (2) Preheating before welding: Preheating is performed by flexible ceramic resistance heating before welding. The heating width of each side is not less than 4 times the wall thickness. During the preheating process, the temperature control thermocouple should be arranged within the heating area. The monitoring thermocouple should be as close as possible to the groove to be welded. The preheating rate is 60°C / h. Use a temperature measuring pen to measure the preheating temperature ...

no. 2 example

[0051] A martensitic heat-resistant steel G115 large-diameter thick-walled pipe welding and combined heat treatment method, taking G115 steel pipe 1 with a diameter of 530 mm and a wall thickness of 115 mm as an example, the ambient temperature for welding is not lower than 5°C, and the wind speed in the welding area is ≤ 2m / s. Specifically, the method includes the steps of:

[0052] (1) Groove preparation: according to figure 1 Process U-shaped grooves, and then pair them to form grooves.

[0053] (2) Preheating before welding: Preheating is performed by flexible ceramic resistance heating before welding. The heating width of each side is not less than 4 times the wall thickness. During the preheating process, the temperature control thermocouple should be arranged within the heating area. The monitoring thermocouple should be as close as possible to the groove to be welded. The preheating rate is 55°C / h. Use a temperature measuring pen to measure the preheating temperature...

no. 3 example

[0063] A martensitic heat-resistant steel G115 large-diameter thick-walled pipe welding and combined heat treatment method, taking G115 steel pipe 1 with a diameter of 530 mm and a wall thickness of 115 mm as an example, the ambient temperature for welding is not lower than 5°C, and the wind speed in the welding area is ≤ 2m / s. Specifically, the method includes the steps of:

[0064] (1) Groove preparation: according to figure 1 Process U-shaped grooves, and then pair them to form grooves.

[0065] (2) Preheating before welding: Preheating is performed by flexible ceramic resistance heating before welding. The heating width of each side is not less than 4 times the wall thickness. During the preheating process, the temperature control thermocouple should be arranged within the heating area. The monitoring thermocouple should be as close as possible to the groove to be welded. The preheating speed is 80°C / h. Use a temperature measuring pen to measure the preheating temperatur...

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Abstract

The invention relates to the technical field of G115 large-diameter thick-wall pipelines, in particular to a novel welding and assembling thermal treatment method for martensite heat-resistant steel G115 large-diameter thick-wall pipeline. In order to solve the problem that quality defect is liable to generate in a novel welding process for the martensite heat-resistant steel G115 large-diameter thick-wall pipeline, a groove design form and a weld bead distribution design are optimized, parameter selection of welding and thermal treatment processes is clear, welding and thermal treatment quality is guaranteed, and the problem that the novel welding and thermal treatment method for the martensite heat-resistant steel G115 large-diameter thick-wall pipeline is unclear is solved.

Description

technical field [0001] The invention relates to the technical field of G115 large-diameter and thick-walled pipelines, in particular to a method for welding and combined heat treatment of novel martensitic heat-resistant steel G115 large-diameter and thick-walled pipelines. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Since 2006, the Iron and Steel Research Institute has carried out research and development of 9%Cr~12%Cr~15%Cr content of 650℃ heat-resistant steel relying on the international cooperation project "650℃ steam parameter ultra-supercritical thermal power unit boiler steel variety research and development and performance research". Exploratory research on co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/235B23K9/32
CPCB23K9/16B23K9/235B23K9/32
Inventor 王登第李平苗慧霞杜传国李汉华毛春生张延涛王伟陈瑞吴富强李海
Owner POWERCHINA SEPCO1 ELECTRIC POWER CONSTR CO LTD
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