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Application of Steel Pipe Demagnetization Technology in Construction

The residual magnetism of steel pipes affects the quality of subsequent deep processing. This article provides a detailed introduction to the principles, advantages and disadvantages of three commonly used methods, namely DC demagnetization, AC demagnetization, heating demagnetization, and composite demagnetization. It summarizes the practical experience of demagnetization and provides principles and methods for construction sites. 0. Introduction To ensure quality, steel pipe manufacturers use magnetic flux leakage and eddy current methods to inspect the pipe body and magnetic particle methods to inspect the pipe ends. The processes of magnetic flux leakage, eddy current, and magnetic particle inspection are all magnetization, […]

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Deep hole machining of large tube plate assembly

Through the development of large heat exchangers, focusing on the deep hole processing test, deep hole processing of tube plate assembly and processing process of processing difficulties in the control method, and ultimately solved the deep hole processing of tube plate assembly process problems. Yaang for an enterprise contracted a large heat exchanger equipment; a large size, complex structure characterizes the equipment. In particular, the deep hole processing of the tube plate assembly has a certain degree of difficulty. To develop a rigorous process program, the use of a CNC three-axis deep hole drilling machine and special BTA drill, after […]

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Analysis of the cause of leakage failure of a reducing tee body

A natural gas treatment plant had a leakage failure of a reducing tee body. Nondestructive testing, physical and chemical inspection, metallographic analysis, and energy spectrum analysis were used to analyze the cause of the failure of the leaking pipe fittings. The results show that the tee was improperly controlled by the molding process, and under axial pressure, the inner surface appeared to be deformed along the radial direction of the main pipe, and the transition between the branch pipe and the main pipe appeared to be wavy and raised, and cracks were produced on the inner surface, and cracks sprouted […]

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Deep hole machining process error analysis of hydraulic support column cylinder

In order to effectively detect the error influence of the two processes of push-boring rolling and scraping rolling on the deep hole processing technology of the hydraulic support forged cylinder, the single factor test analysis method was used to detect the size deviation and cylindricity of the two processes. The quantitative analysis was carried out in combination with the detection data curve. The results show that compared with the push-boring and rolling process, the standard deviation of the dimensional deviation of the scraping and rolling process is 142.8% of the push-boring and rolling process, the cylindricity is 153.8% of the […]

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Analysis of the Properties and Causes of Surface Voids and Defects in Large Ri……

After rough machining, a large ring manufactured by a certain company was dissected and analyzed for holes and defects found on its surface. The results indicate that many internal porosity defects and leakage cause the surface porosity defects of large ring components. In contrast, the internal defects of the ring components are caused by low-temperature cold forging. 1. Experimental analysis 1.1 On site macro analysis The rings are placed in the open air, and the surface has been corroded. Many holes are densely distributed on a section of the circular surface about 50cm long, ranging in size from 2mm to […]

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Forging Process Method for Large Punched Free Forging Rings

Large punch type free forging rings are widely used in large construction machinery such as shield tunneling machines. These products have the characteristics of large diameter, small inner holes, and thick thickness. Due to the harsh service conditions and complex stress conditions of construction machinery components, users have high requirements for the internal structure, non-destructive testing, and comprehensive mechanical properties of forgings to ensure their service life. Requirements for large forged rings Our company has recently undertaken large-scale forging rings made of Q345B, a low alloy high-strength structural steel. The outer diameter of the finished product is about 3.5m, the […]

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Optimization of forging process for manhole hole flange cover

The manhole hole flange cover is one of the important components in the small forgings of hydrogenation reactors, which is limited by its unique shape and size. Suppose traditional forging methods are used for forging. In that case, the remaining forging blocks are large, the forging cost is high, the production cycle is long, and the mechanical properties of the parts are affected. Based on production practice, optimize its forging process and explain its significance. Hydrogenation reactors are the most commonly used and important equipment in the actual production process of the petrochemical industry. As an important component of hydrogenation […]

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Study on Surface Hardness Quality of 2A70 Aluminum Forgings

Aiming at the problem of the continuous unqualified hardness of 2A70 aluminum alloy forgings in our company, we studied the impact of different raw material specifications and different heat treatment systems on the hardness of 2A70 aluminum alloy forgings, and concluded that the content of strengthening elements in the chemical composition of the raw material has a significant impact on the surface hardness of the forgings; For forgings with low surface hardness, either adding artificial aging for one time or resolution can improve the surface hardness of the forgings. 2A70 aluminum alloy belongs to the Al-Cu-Mg-Fe-Ni system heat-resistant aluminum alloy, […]

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The non-uniformity of the connection force of chemical equipment flange

In order to improve the stability of flange connection and guarantee the performance in chemical equipment, this paper will take the flange connection as the object, take the flange of the heat exchanger tube box as an example, for the non-uniformity of stress distribution is discussed. The non-uniformity of stress in flange connection is quantitatively analyzed in different cases. As we all know, the operating environment of chemical equipment is very complex, and there are some media with corrosive, flammable, explosive, and toxic characteristics. Therefore, for the operation of chemical equipment, it is crucial to ensure the sealing and reliability […]

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Corrosion cracking failure analysis of 304 stainless steel flange connection d……

The 304 stainless steel flange fastening double-headed stud under the safety valve at the top of the gas separation tank in the process of service corrosion cracking, through macroscopic examination, chemical composition testing, metallographic analysis, scanning electron microscopy and energy spectrum analysis, etc., the 304 stainless steel double-headed stud cracking causes were analyzed. The results show that there are two main reasons for the cracking of the stud, one is that the material is not qualified, Cr content is lower than the standard value; the second is due to more S, Cl elements in the coastal industrial atmosphere, resulting in […]