Supercharge Your Innovation With Domain-Expert AI Agents!

Method for heat treatment of welded joint in tube panel

A technology of tube screens and tube fittings, applied in the field of heat treatment, which can solve problems such as cumbersome operations, affecting the quality of heat treatment of welded joints, and uneven heating of tubes

Active Publication Date: 2015-07-22
CHINA SHENHUA ENERGY CO LTD +1
View PDF2 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for heat treatment of welded joint in tube panel
  • Method for heat treatment of welded joint in tube panel
  • Method for heat treatment of welded joint in tube panel

Examples

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 against 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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/50C21D1/34
CPCC21D1/34C21D9/50
Inventor 刘鸿国
Owner CHINA SHENHUA ENERGY CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com