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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 […]

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Discussion on flange machining process and tooling design

In industrial production, the joint connection between pipes is usually realized by flanges, and the equipment can also be connected between the inlet and outlet of the equipment. Common flanges have a variety of material processing technology, and the characteristics of the material will also have some differences according to the level of flange machining technology. In the actual production process, flange machining has different requirements in terms of material and design. This paper studies the contents of flange machining process and tooling design, hoping to play a corresponding reference role. In the current industrial production, flanges are widely used […]

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Analysis of the Variable Slope Section of the Forged Weld Neck Flange Neck Mad……

Based on the research results of forged weld neck flanges, we analyze the forged weld neck flange neck slope section from both theoretical analysis and finite element simulation, focusing on the influence of slope slope and flange neck height on the force characteristics of the flange, and propose the suggested values of forged weld neck flange neck slope section based on the analysis results. 1. Overview Steel pipe towers are increasingly used in practical engineering. Flange connection is the main connection form of steel pipe structure. Forging weld neck flange connection without welding stiffening ribs, butt welds can be mechanically […]

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Weldability Analysis and Application of Hastelloy C-276 Pipeline

What is Hastelloy C-276? Hastelloy C-276 (abbreviated: Hastelloy) is a nickel-based alloy, which is mainly used in strong corrosive media. In order to improve the corrosion resistance and cold and hot processing performance of Hastelloy C-276, Hastelloy C-276 has undergone three major improvements, namely, it is divided into three series of B, C and G, and has been widely used in many fields abroad, such as petroleum, chemical industry and environmental protection. In the paper, combined with the actual engineering, the introduction of Hastelloy C-276 alloy pipe welding technology. 1. Application background A large domestic petrochemical plant to expand 450,000 […]

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Effect of solution temperature on 316L austenitic stainless steel δ Effect of ……

The 316L austenitic stainless steel containing residual ferrite was solution treated at different temperatures. The microstructure, texture and precipitates of the test samples were analyzed by SEM, EBSD, TEM and microhardness techniques. The results show that there are three phases of austenite, ferrite and sigma in austenitic stainless steel after solution treatment at 900-1100 ℃ for 30 min and water quenching. Sigma phase is formed in the range of 900-1000 ℃, which will improve the hardness of the matrix. Sigma phase mainly consists of residual δ Ferrite decomposition, {001} < 110 > and {001} < 100 > oriented δ Ferrite […]

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Discussion on heat tracing design of chemical pipeline

This paper briefly introduces the heat tracing methods of process pipes in chemical plants, and studies the steam heat tracing design of process pipes in chemical plants based on various heat tracing methods in chemical production process. With the increasing energy crisis in the world, how to save energy has become one of the highly important research areas in the world. Insulation of equipment and pipelines is one of the important energy saving measures. In order to prevent the equipment and pipeline from emitting or absorbing heat to the surrounding environment during the production process, thermal insulation engineering has become […]

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What is a filter

What is a filter? The filter is an indispensable device in the pipeline for transporting media and is usually installed at the inlet end of other equipment such as pressure reducing valves, pressure relief valves, constant water level valves. The strainer is composed of a barrel, a stainless steel screen, a drainage part, a transmission device and an electrical control part. After the water to be treated passes through the cartridge of the filter screen, its impurities are blocked. When cleaning is needed, it is only necessary to take out the removable cartridge and reload it after treatment, so it […]

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Expansion Joints: Everything You Need To Know

Expansion joints are flexible components that can effectively play a role in compensating for axial deformation. For example, welded in the fixed tube plate heat exchanger shell on the expansion joint axial flexibility, easy deformation, can compensate for the difference in thermal expansion of the tube and shell due to different wall temperatures, reducing their axial load, thereby reducing the tube, tube plate and shell temperature stress, to avoid causing strength damage, instability damage and tube pull-off damage. There are more types of expansion joints, commonly used waveform, ring plate welding and shell structure, among which waveform expansion joints are […]

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Heat treatment of stainless steel

Stainless steel has been invented from the early 20th century to less than a century, but the momentum of its development and application is exceptionally rapid. Especially since the late 1960s, the world’s production of stainless steel basically maintained an average annual growth rate of 4%, the application of stainless steel has gradually expanded to all areas of the national economy. The reason why stainless steel can be so rapid development, an important factor is its corrosion resistance, heat resistance. The advantages and disadvantages of stainless steel heat treatment process on the corrosion and heat resistance of stainless steel has […]

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Development of seamless steel pipe for 20MnV hydraulic cylinder

In recent years, the global construction machinery industry has shown a stable development trend. With the rapid development of various major infrastructure construction in China, especially the development of the engineering construction business represented by “One Belt One Road”, the traditional market is growing steadily, and the demand for domestic construction machinery is growing steadily, while the technical indicators of energy consumption, strength and stability of construction machinery have raised higher requirements. As an important part of construction machinery, hydraulic cylinder has extremely high requirements on cushioning, high load, high frequency and stability. As the most important raw material of […]

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