A Q245R material nondestructive stress test method

Abstract

The invention relates to a Q245R material nondestructive stress test method. By taking the measured coercivity value of the device under test into different formulas in different states, the stress value of the device under test can be obtained. The method can realize accurate and quantitative testing of stress states of Q245R materials. In the invention, according to the characteristics of the magnetization of the Q245R materials and the magnetic memory parameters, the test efficiency is high; tests can be carried out repeatedly to facilitate the re-inspection. The method of the invention can carry out the non-destructive field nondestructive testing on the equipment and pipelines produced with the Q245R materials; the detection process is simple and effective; and requirements for surface conditions of the equipment are not high, thereby saving the testing cost. The method of the invention makes clear the load states of the pipelines, equipment, etc. to prevent accidents related to stress synergy so as to reduce enterprise losses and bring obvious social benefits.

Description

technical field [0001] The invention relates to a method for detecting stress, in particular to a method for nondestructively detecting stress of Q245R material. Background technique [0002] As a high-quality carbon structural steel, Q245R is widely used due to its simple manufacturing process, low price, and good mechanical properties. During the manufacturing process of steel, after different heat treatments, its internal structure will change, and the change will also be accompanied by changes in physical and mechanical properties. During use, due to a variety of different loads, the local stress in the material may be as high as several times or even dozens of times the nominal stress, and it is easy to generate dislocation and slip deformation, induce cracks, and lead to creep, fatigue and corrosion speed. faster, thereby increasing the likelihood of material failure. [0003] A large number of destructive accidents are caused by the synergy of stresses. According t...

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Problems solved by technology

[0008] Q245R material will bear various complex loads during the use in chemical plants and power plants. The traditional stress measurement method has high requirements on the surface of equipment and pipelines, and needs to be polished or even polished. It is impossible to find serious stress concentration. The detection process is complex and The results are not reproducible enough

At the same time, it is impossible to quickly evaluate the overall stress state of the equipment online

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