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A local post-weld heat treatment method for super-large containers made of quenched and tempered materials

A post-heat treatment, ultra-large technology, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve the problems affecting the mechanical properties of steel plates, large temperature differences in weld areas, and temperatures that easily exceed 620 ° C, to reduce axial temperature Gradient, improve temperature uniformity, satisfy the effect of uniformity

Active Publication Date: 2018-01-05
SHANDONG NUCLEAR POWER EQUIP MFG
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  • 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

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  • A local post-weld heat treatment method for super-large containers made of quenched and tempered materials

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 piece.

[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...

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Abstract

The invention discloses a partial post-weld heat treatment method for an ultra-large container made of quenched and tempered material. In this method, the temperature control thermocouple is set on the heating plate, and placed at the highest temperature point of the heating plate, and the temperature of the steel plate is controlled by controlling the temperature of the heating plate to make the temperature of the steel plate reach the specification. The required heat preservation temperature, and can effectively prevent the temperature of the steel plate from exceeding the required upper limit; by implementing partition control on the heating plates, each piece or each group of heating plates is connected to a temperature control channel or temperature control equipment, according to the steel plate The temperature of the temperature measurement point can be adjusted individually for each piece or each group of heating pieces, which can effectively improve the temperature uniformity of the temperature uniformity zone. The method of the invention ensures that the temperature range of the temperature equalization zone can meet the requirements of post-weld heat treatment.

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

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Application Information

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Patent Type & Authority Patents(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
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