Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Heat treatment method after local welding of quenched and tempered material super-large container

A post-heat treatment, ultra-large technology, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve the problems of large temperature difference in the weld area, affect the mechanical properties of the steel plate, and the temperature is easy to exceed 620 ° C, so as to improve temperature uniformity , reduce the axial temperature gradient, and satisfy the effect of uniformity

Active Publication Date: 2015-12-30
SHANDONG NUCLEAR POWER EQUIP MFG
View PDF5 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the local post-weld heat treatment methods in the prior art are generally carried out by resistance sheet heating or radiation heating, using temperature control equipment to heat the steel plate, and the temperature control thermocouple is connected to the steel plate, and the traditional heating method sets the heating sheet The same temperature will cause a large temperature difference in the weld area to be heat treated. This method is difficult to control the heat treatment temperature at the center of the weld and 50mm from the edge of the weld between 595°C and 620°C, and the temperature is likely to exceed 620°C , thus affecting the mechanical properties of the steel plate

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
  • Heat treatment method after local welding of quenched and tempered material super-large container

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Heat treatment test steel plate: Quenched and tempered steel plate SA738B, the specification is 100000*4000*45 (mm) 1 sheet.

[0030] Insulation material: aluminum silicate insulation cotton, thickness 180mm, specification 610*4000(mm).

[0031] Crawler heater: specification 600*400(mm), single chip power 10KW.

[0032] Temperature control box: 2 intelligent temperature control boxes, rated power 480KW, 12 temperature control points, temperature control accuracy ±2°C.

[0033] Thermocouple: simple K-type thermocouple, length 2 meters, temperature range 0~800℃, accuracy class I.

[0034] Paperless recorder: 3 sets.

[0035] Energy storage welding machine: 1 set.

[0036] Perform post-weld heat treatment on the longitudinal 4000mm long weld seam, the operation steps are as follows:

[0037] (1) Fix the crawler heater on the wire mesh.

[0038] (2) Fix the thin steel sheet at the position with the highest temperature of the heating sheet, and spot-weld the temperature...

Embodiment 2

[0050] Heat treatment test steel plate: Quenched and tempered steel plate SA738B, the specification is 100000*4000*45 (mm) 1 piece.

[0051] Insulation material: aluminum silicate insulation cotton, thickness 180mm, specification 610*4000(mm).

[0052] Crawler heater: specification 600*400(mm), single chip power 10KW.

[0053] Temperature control box: 2 intelligent temperature control boxes, rated power 480KW, 12 temperature control points, temperature control accuracy ±2°C.

[0054] Thermocouple: simple K-type thermocouple, length 2 meters, temperature range 0~800℃, accuracy class I.

[0055] Paperless recorder: 3 sets.

[0056] Energy storage welding machine: 1 set.

[0057] Perform post-weld heat treatment on the longitudinal 4200mm long weld seam, the operation steps are as follows:

[0058] (1) Fix the crawler heater on the wire mesh.

[0059] (2) Fix the thin steel sheet at the position with the highest temperature of the heating sheet, and spot-weld the temperature...

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
diameteraaaaaaaaaa
heightaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a heat treatment method after local welding of a quenched and tempered material super-large container. According to the method, a temperature-controlled thermocouple is arranged on a heating sheet and is placed at a point with the highest temperature of the heating sheet, the temperature of a steel plate can reach a holding temperature required by a norm by controlling the temperature of the heating sheet and using the characteristic that a certain temperature difference exists between the temperatures of the heating sheet and the steel plate, and the temperature of the steel plate can be effectively prevented from exceeding a required upper limit value; and by performing zone control on the heating sheet, each sheet or each group of heating sheets is connected to a temperature-controlled passage or temperature-controlled device, and according to the temperature of a temperature measuring point of the steel plate, each sheet or each group of the heating sheets is subjected to temperature adjustment separately, so that the temperature uniformity of a uniform temperature zone is effectively improved. The method disclosed by the invention ensures that the temperature range of the uniform temperature zone can meet requirements of heat treatment after welding.

Description

technical field [0001] The invention belongs to the field of pressure vessel heat treatment, and relates to local post-weld heat treatment of large pressure vessels, in particular to a local post-weld heat treatment method for super large vessels made of quenched and tempered materials. Background technique [0002] In recent years, with the development of my country's economy and the increasing demand for energy, the country has placed nuclear energy in a prominent position in the energy development strategy, and has formed a domestic nuclear power equipment market with great potential. Nuclear pressure vessels have been working in the environment of high temperature, high pressure, corrosive medium and neutron irradiation for a long time, so the structural quality control in the manufacturing process is very important. Welding is an essential process for preparing nuclear pressure vessels. Due to the highly concentrated instantaneous heat input during the welding process, ...

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): C21D9/50C21D11/00
Inventor 杨中伟王刚董永志王厚高晏桂珍宋聚海
Owner SHANDONG NUCLEAR POWER EQUIP MFG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com