Best strain of austenitic stainless steel container welding residual stress overload reducing method

A technology of austenitic stainless steel and residual stress, applied in the direction of improving process efficiency, etc., can solve the problem of not doing the best strain, and achieve the effect of reliability assurance

Active Publication Date: 2013-06-19
北京市朝阳区特种设备检测所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] At present, there have been studies on the elimination of welding r...

Method used

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  • Best strain of austenitic stainless steel container welding residual stress overload reducing method
  • Best strain of austenitic stainless steel container welding residual stress overload reducing method
  • Best strain of austenitic stainless steel container welding residual stress overload reducing method

Examples

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example 1

[0039] like figure 1 As shown, in Embodiment 1 of the present invention, a circular pressure vessel made of austenitic stainless steel is used. The circular pressure vessel has an inner diameter of 600 mm and a wall thickness of 5 mm, including an oval head 1, a barrel section 2, and a barrel section 3. Cone 4, connecting flange 5, reinforcing ring 6, support 7 and backing plate 8. The components of the circular pressure vessel are mainly composed of three kinds of dissimilar steel materials: 06Cr19Ni10, 022Cr17Ni12Mo2 and Q235B. Among them, the oval head 1, the barrel section 2, the cone 4, the connecting flange 5, the reinforcing ring 6 and the backing plate 8 are respectively It is made of 06Cr19Ni10 dissimilar steel, the barrel section 3 is made of 022Cr17Ni12Mo2 dissimilar steel, and the support 7 is made of Q235B dissimilar steel.

[0040] The cylindrical body of the circular pressure vessel is rolled by a plate rolling machine, the cone is cold rolled by a plate rollin...

example 2

[0049] like figure 2 and image 3 As shown, in Embodiment 2 of the present invention, a square jacketed container with tie bars is used. The material of the main body of the container is 5mm thick 06Cr19Ni10 and 022Cr17Ni12Mo2 two kinds of dissimilar steels, and the material of the tie bars and the jacket is Q235B steel. Plug welding is used between the jacket and the tie bars, and symmetrical intermittent fillet welds are used between the main body and the tie bars. Stress corrosion occurs in this fillet weld in a short period of time during use. The purpose of the treatment is to reduce the main body of the fillet weld area. welding residual stress.

[0050] The square jacketed container with tie bars includes a main body plate 13, a main body plate 14, a sealing plate 15, a jacket plate 16, a tie bar 17, and a pipe joint 18, wherein the main body plate 13 and the sealing plate 15 are made of 06Cr19Ni10 material, The main body plate 14 is made of 022Cr17Ni12Mo2 material, ...

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Abstract

The invention provides best strain of an austenitic stainless steel container welding residual stress overload reducing method. The best strain of the austenitic stainless steel container welding residual stress overload reducing method comprises: (1) a best value exists in overload dependent variable for reducing welding residual stress, the dependent variable corresponding to first major principal stress in direction in a continuous structure zone serves as an evaluation index and overload plastic strain is in a range of 2%-5%; (2) in the process of overload, boosting speed is controlled through a variable frequency pump or an automatic control reflux valve, uploading speed is in a range of 0.2 MPa/min-0.4 MPa/min and the dependent variable is controlled through deformation measurement or strain measurement; and (3) when a container is manufactured, a tensile test is firstly performed to materials, design stress and overload stress are determined according to an actual single tensile curve of the materials and design pressure and overload pressure are calculated through a simplified method. Numerical modeling has universality and generality, evaluation stress is corroded, first tensile welding residual stress is reduced to a great extent and the residual stress after reduction is in the same level with residual stress of a cold rolling plate rear base material and residual stress after stress relief heat treatment.

Description

technical field [0001] The invention belongs to a treatment method for reducing stress corrosion and fatigue damage of a welded pressure vessel, in particular to an optimal strain and control method for reducing welding residual stress by overload stretching of an austenitic stainless steel pressure vessel. Background technique [0002] At present, many equipment in industries such as weapons, aerospace, aircraft carrier shipbuilding, nuclear power, bridges, and pressure vessels are manufactured by welding methods. The internal restraint force formed after welding, that is, the residual stress, is generally higher than the working load stress, resulting in fatigue fracture during equipment use. , Stress corrosion cracking and deformation, so important equipment must reduce welding residual stress. [0003] Austenitic stainless steel is non-magnetic, has good corrosion resistance and ductility, and is widely used in many industries, especially nuclear power, food and medical ...

Claims

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Application Information

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IPC IPC(8): C21D7/00
CPCY02P10/20
Inventor 赵尔冰刘明
Owner 北京市朝阳区特种设备检测所
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