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Cause analysis on cracking of SUS304 austenitic stainless steel flange

During the pressure test of a new process pipeline in a chemical plant, the leakage of an austenitic stainless steel flange on the pipeline led to the interruption of the pressure test. The main material of the pipeline is austenitic stainless steel SUS304. According to the site macroscopic inspection, the pipeline installation position is qualified, the support layout is reasonable, and the pipeline structure is normal, which meets the design and technical requirements. The design pressure of the pipeline is 1.6Mpa, and the test pressure is 2.4Mpa. When the pressure is slowly raised to 0.6MPa, a flange leaks and the […]

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Research on corrosion resistance of super austenitic stainless steels such as ……

Introduction to Super Austenitic Stainless Steel About Super Austenitic Stainless Steel The basic metallographic structure of super austenitic stainless steel is typical, 100% austenite. However, due to the high content of chromium and molybdenum, some metal mesophases are likely to appear. These metal mesophases often appear in the center of the plate. However, if the heat treatment is correct, the formation of these metal mesophases will be avoided, resulting in nearly 100% austenite. The metallographic structure of 254SMO does not have any other metal mesophase. The structure is obtained after heat treatment at a temperature of 1150 to 1200 degrees.  In the actual use process, if a small […]

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Cause analysis and preventive measures for EH oil pipeline fracture of steam t……

There are 6 coal-fired power units in a power plant, including 600MW 2 units and 300MW 4 units. The steam turbines are all produced by the same domestic steam turbine plant. The digital electro-hydraulic control system (DEH) and high-pressure fire resistant oil (EH oil) are used for hydraulic control. The main steam valve, control valve, bypass system and steam distribution mechanism of feed pump steam turbine are controlled at 14.5 About MPa, it has the advantages of fire prevention, sensitivity and high precision. EH oil system is unstable for many times in operation, which is mainly manifested in cracks or […]

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Study on low temperature tensile properties of thick wall X80 pipeline at diff……

Pipeline transportation is one of the most economical and safe ways for long-distance transportation of crude oil and natural gas. In order to improve transportation efficiency, reduce energy consumption and construction cost, the development of pipeline steel aims to achieve high strength and superior weldability. In recent years, with the increasing demand of global oil and gas resources, the research and construction of oil and gas pipelines in China has entered a new peak. Large diameter, thick wall and high-grade steel pipes have become one of the main options for pipeline construction [1-2]. X80 steel not only meets the requirements […]

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Measurement of bending angle of induction bending for oil and gas transportation

What is Induction Bending? Induction Bending is a controlled means of bending pipes through the application of local heating using high frequency induced electrical power. Originally used for the purpose of surface hardening steels, induction technology when used in pipe bending consists basically of an induction coil placed around the pipe to be bent. The induction coil heats a narrow, circumferential section of the pipe to a temperature of between 850 and 1100 degrees Celsius (dependant on the material to be formed). As the correct bending temperature range is reached, the pipe is moved slowly through the induction coil whilst […]

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Discussion on the influencing factors of bolt tension test

The tensile strength of the bolt is the maximum tensile force that the bolt can bear before breaking in the axial direction. It is the critical value of the transition from the uniform plastic deformation to the local concentrated plastic deformation. It is also the maximum bearing capacity under the static tensile condition. The yield strength of bolt refers to the phenomenon that when the stress reaches a certain value, it will not increase or fluctuate in a small range, but the strain will increase sharply. Standard basis Generally, the national standard for testing the mechanical properties of bolts is […]

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What is pipeline valve?

What is pipeline valve? In the fluid piping system, valve is the control element, its main function is to isolate equipment and piping system, regulate flow, prevent backflow, regulate and discharge pressure. It can be used to control the flow of air, water, steam, corrosive media, mud, oil, liquid metal and radioactive media. Because it is very important to select the most suitable valve for the piping system, it is very important to understand the characteristics of the valve and the steps and basis for selecting the valve. Valve material selection The final control of the pipeline is the valve. […]

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Leakage analysis and treatment of large flange in s-zorb reactor

The first s-zorb unit of a refinery was built and put into operation in 2009, with a designscale of 1.5 MT / A. the clean gasoline is produced by adsorption desulfurization technology, which has the characteristics of high desulfurization rate (sulfur content is reduced from 1000 μ g / g to less than 10 μ g / g) andsmall octane number loss. Since the firststart-up in November 2009, the reactor flange of the unit has been leaking, and it has been on fire for many times, which has become an important bottleneck affecting thesafe production and normal operation of the […]

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Principle, installation and maintenance knowledge of pneumatic control valve

What is pneumatic control valve? Pneumatic control valve is one of the industrial process control instruments widely used in petroleum, chemical, electric power, metallurgy and other industrial enterprises. In chemical production, regulating valve is essential in regulating system. It is an important part of industrial automation system, such as automation of production process. Now let’s have a comprehensive understanding of pneumatic control valve. Working principle Pneumatic control valve is to use compressed air as power source, cylinder as actuator, and with the aid of electric valve positioner, converter, solenoid valve, position maintaining valve and other accessories to drive the valve, realize […]

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Electrochemical noise detection of 316L stainless steel atmospheric corrosion:……

China has a vast marine area, which is one of the important areas for future resource development. The construction of islands and reefs is an important step of ocean development, in which a large number of metal materials, including stainless steel materials, are needed for infrastructure construction. In addition, stainless steel is also used as structural material for military equipment such as warships. However, the atmospheric corrosion of stainless steel is often an important factor restricting its application. Stainless steel materials are widely used as metal components in the atmospheric environment, but in the atmosphere with strong corrosiveness such as […]

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