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What is the performance grade of valve bolts?

The performance grade of bolts for valve steel structure connection can be divided into more than 10 grades, such as 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9 and 12.9. Among them, grade 8.8 of bolts and above are made of low-carbon alloy steel or medium carbon steel and heat-treated (quenching and tempering), which are generally called high-strength bolts, and the rest are commonly referred to as ordinary bolts. The bolt performance grade label consists of two parts, which respectively represent the nominal tensile strength and yield strength ratio of bolt material. For example: The meaning of bolts with performance grade 4.6 is […]

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Why do low temperature valves use long neck covers?

Suitable for medium temperature – 40 ℃ ~ – 196 ℃ valve is called low temperature valve, and this kind of valve generally adopts long neck valve cover. The long neck valve cover is adopted to specify low temperature valves, including low temperature emergency shut-off valve, low-temperature stop valve, low-temperature check valve, LNG special low-temperature valve, etc., which are mainly used in 300000 tons of ethylene, liquefied natural gas and other chemical plants. The output liquid low-temperature medium, such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products, etc., is not only flammable and explosive, but also needs […]

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Corrosion Failure Analysis of Pipe Tee in a Natural Gas Field in West China

A pipe burst accident occurred in a straight-inserted pipe tee of a gathering and transportation pipeline in a western natural gas field. The main pipe of the pipe tee was made of 16Mn steel and the branch pipe was made of 316L+L416 bimetallic composite pipe. By observing the morphology of the failed tees, measuring the wall thickness of the failed pipe tees, using electrochemical methods to study the galvanic corrosion behavior of 16Mn steel and 316L stainless steel in the simulated gas field environment, using the FLUENT software to analyze the in-line, 45° and 30° respectively. Numerical simulation calculation is […]

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Process flow of stainless steel pipe fittings

Generally speaking, the process flow of manufacturing stainless steel pipe fittings includes blanking, forming, heat treatment, surface treatment, cutting, non-destructive testing, surface protection and marking in order of sequence. The following is a detailed description of the steps. Cutting The materials used for pipe fittings are mainly pipes, plates and bars, and the blanking method is selected according to the characteristics of the material and the shape of the blank used in the product. The shape, size and other requirements of the blank are carried out according to the process regulations of different products. For pipes, commonly used cutting methods […]

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Welding technology and application of 2205 duplex stainless steel

2205 duplex stainless steel has high yield strength, not only has strong chloride stress corrosion resistance, but also has good comprehensive mechanical properties. The market application prospect is broad. The welding process is complex, and it is very important to ensure the phase proportion balance of the weld and HAZ. 2205 duplex stainless steel in our company to undertake a large number of materials used in the project, its weldability analysis, process qualification test, to master the welding technology of the material, has practical significance for the promotion of the project. Welding analysis of duplex stainless steel Weldability analysis of […]

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Cold upsetting forming technology of fasteners

Cold upsetting (extrusion) technology is a main processing technology in the forming process of fasteners. Cold upsetting (extrusion) belongs to the category of metal pressure processing. In production, under normal temperature, the metal is applied with external force to form the metal in the predetermined die. This method is usually called cold upsetting. In fact, the forming of any fastener can be realized not only by cold upsetting, but also by forward and backward extrusion, compound extrusion, punching, rolling and so on. Therefore, the term “cold heading” in production is just a habitual term, more precisely, it should be called […]

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Analysis of titanium welded pipe in salt making equipment and its application ……

Titanium has the advantages of low density, high yield ratio, good heat resistance, low temperature resistance and heat transfer performance, especially good corrosion resistance in neutral and oxidizing media. It is widely used in many fields such as seawater desalination, electric power industry, petrochemical industry, aviation, aerospace industry, shipbuilding industry, military industry and so on It has a history of more than 40 years. At present, the world’s technologically advanced countries have basically replaced the titanium seamless pipe with titanium welded pipe, while in China, the titanium seamless pipe is still the main one. For a long time, due to […]

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Installation instructions and steps of wafer butterfly valve

What is wafer butterfly valve? The butterfly plate of the wafer butterfly valve is installed in the diameter direction of the pipe. In the cylindrical channel of butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0 ° and 90 ° to regulate the flow. When the butterfly plate is rotated to 90 °, the valve reaches the maximum opening. The wafer butterfly valve is simple in structure, small in size and light in weight, and only consists of a few parts. Moreover, the valve can be opened and closed quickly by […]

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Stainless steel water supply pipeline: a reliable solution to water leakage an……

Water leakage is a global problem. According to data from the World Bank and OECD: The daily loss of water in developing countries due to water leakage is approximately 45 million cubic meters – enough for nearly 200 million people; After the water produced by the water company is exported from the treatment plant, more than 25% is not actually used by consumers, that is, it is not included in consumer bills and becomes non-revenue water (NRW); The amount of non-revenue water in some cities is as high as 70%; The annual loss of non-revenue water is about 14 billion […]

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Production equipment of stainless steel pipe

Sharp tools make good work. For production-oriented enterprises, equipment is undoubtedly the lifeblood of an enterprise. The quality of the equipment determines the product quality and performance, and also determines the future operation of the enterprise. Common equipment in stainless steel pipe enterprises Stainless steel pipe is usually divided into seamless pipe and welded pipe. And in the production process, the required equipment is not the same. The difference can be seen from the two production process flow chart. Fig.1 production process flow of seamless pipe The above figure shows the production process of seamless pipe. It can be seen […]

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