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A method for heat treatment of pipe screen welds

A technology of tube panels and fittings, applied in the field of heat treatment, which can solve problems affecting the quality of heat treatment of welded joints, difficulties in heat treatment methods, and large residual stress in tissues

Active Publication Date: 2017-01-11
CHINA SHENHUA ENERGY CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has the disadvantages of cumbersome operation, difficult temperature control, uneven heating in the circumferential direction of the pipe, resulting in large residual stress in the structure, etc., which seriously affects the quality of heat treatment.
Especially for some high-temperature reheater tube panels, the upper and lower parts of the welded joint have different specifications and sizes, which makes the above heat treatment method more difficult and affects the heat treatment quality of the welded joint

Method used

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  • A method for heat treatment of pipe screen welds
  • A method for heat treatment of pipe screen welds
  • A method for heat treatment of pipe screen welds

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Experimental program
Comparison scheme
Effect test

Embodiment

[0046] The main chemical components of T92 alloy steel pipe fittings are shown in Table 1.

[0047] Table 1

[0048]

[0049] The pipe wall thickness is 7mm, the pipe diameter is 50mm, the welding seam width is 6mm, the heating box length is 1100mm, the width is 250mm, the number of pipes is 16, the center line position is 2cm above the welding seam, and the insulation layer thickness on the bottom plate 11 of the heating box 1 50mm, the thickness of the insulation layer pressed on the side plate 12 of the tube panel 3 is 150mm; the total power of the heating device is 20kw.

[0050] The heat treatment process is: heat treatment heating temperature 760±10℃, constant temperature time 120h, lifting rate 150℃ / h, when the temperature is below 300℃, the heating speed may not be controlled.

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Abstract

The invention relates to the field of heat treatment and discloses a method for heat treatment of a welded joint in a tube panel. The method comprises the following steps: a, forming a heating space on the periphery of the welded joint in the tube panel (3); b, performing radiation heating on the welded joint in the tube panel (3) through the heating space. As a heating device is arranged on the tube panel, thermal radiation heating is performed on the welded joint in the tube panel, so that the problem of larger temperature gradient at the welded joint caused by direct heat conduction type heating can be solved, and the uniform heating of the welded joint can be realized, therefore, the heat treatment temperature of the welded joint is more uniform, and the heat treatment quality is improved.

Description

Technical field [0001] The present invention relates to the field of heat treatment, and in particular, to a method for heat treatment of tube panel welds. Background technique [0002] High-temperature superheater and high-temperature reheater are important components of the high-temperature heating surface of the boiler, and together with the water wall and economizer, they form the boiler furnace. The inlet section and outlet section of the high-temperature superheater and high-temperature reheater are connected to the header using pipe fittings made of new heat-resistant steel materials. After the pipe fittings are welded to the high-temperature superheater and high-temperature reheater, they need to be checked at the construction site. The welds of the pipe fittings are welded and heat treated. The post-weld heat treatment is to reduce the residual stress of the welded joint and improve the structure and performance of the weld metal. Due to the strong sensitivity to weldi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/50C21D1/34
CPCC21D1/34C21D9/50
Inventor 刘鸿国
Owner CHINA SHENHUA ENERGY CO LTD
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