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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 […]

2020-10-05 read more...
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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 […]

2020-10-05 read more...
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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 […]

2020-09-23 read more...
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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 […]

2020-09-04 read more...
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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 […]

2020-08-20 read more...
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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 […]

2020-08-09 read more...
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Problems and development countermeasures in stainless steel flange industry

What is a flange? A pipe flange is a mechanical device to join pipes. Flanges are available in multiple shapes, as welding neck (the pipe is welded to the collar of the flange), threaded (the pipe is screwed on the flange), socket weld (fillet welds connections), lap joint (for connections using stub ends), slip on, etc. The ASME B16.5 and ASME B16.47 specifications cover US standard pipe flanges, the EN 1092-1 specification covers European steel flanges. Pipe flanges are available in dimensions between 1/8 and 80 inches and in multiple (forged) material grades as ASTM A105 (carbon steel flanges for high-temperature service), ASTM A350 (CS flanges for low temperature), ASTM […]

2020-08-02 read more...
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Failure analysis and preventive measures of stainless steel flange bolt connec……

Objective: To study the failure mechanism of stainless steel flange bolt connection in low temperature environment. Methods: the chemical composition of stainless steel bolt material and the composition of corrosion products at fracture surface were analyzed by macro examination, micro detection, chemical composition analysis and energy spectrum analysis. Results: the main cause of bolt fracture was stress corrosion cracking in low temperature environment. Conclusion: according to the main influencing factors of stress corrosion of stainless steel bolts, the preventive measures of stress corrosion of bolts in low temperature filling system are put forward. What are flange bolts? Flange bolts are […]

2020-07-10 read more...
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Electrochemical corrosion behavior of 254SMO stainless steel in simulated cond……

Due to the need of water saving, energy saving and emission reduction, many iron and steel plants’ blast furnace gas gradually changed from wet dedusting to dry dedusting, but then the corrosion of blast furnace gas pipe network increased obviously. The main reason is that the dry dedusting can not remove a large number of water-soluble chlorine containing substances and other acid substances in the blast furnace gas, which are left in the clean gas and transported out with the pipeline. Under the appropriate temperature and pressure, the water vapor in the gas condenses, and a large number of chlorine […]

2020-06-24 read more...
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Corrosion of stainless steel pipeline in offshore environment

In an island power transmission project: 321 stainless steel seamless pipe is used for water system transmission. The surface treatment method of outdoor pipeline is sand blasting. After being put into use for 10 months, it was found that the surface of the outdoor pipeline was seriously rusted and there were more rusts. It is found that the rust on the surface of the pipeline is floating rust, which can be removed by wiping with a drawcloth. In order to find out the cause of corrosion of outdoor stainless steel pipeline in a short time and solve the problem of […]

2020-05-21 read more...
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