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High temperature corrosion analysis of TP310S stainless steel pipe

The corrosion of TP310S stainless steel pipe in high temperature environment was analyzed by energy spectrum and X-ray diffraction, and the vulcanization mechanism of TP310S stainless steel in high temperature environment was analyzed. Preface TP310S (national standard 0Cr25Ni20) has excellent high temperature mechanical properties and high temperature oxidation resistance. As a structural material, TP310S is often used in some high temperature environments. The 310S seamless pipe used in a chemical plant had steam leakage after one month of use, and then the inlet and outlet valves of the steam superheater were closed and stopped using; the boiler shutdown detection found […]

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Research progress of hydrogen induced cracking of high strength aluminum alloy

Aluminium and aluminium alloys As an environment-friendly lightweight material, it has the advantages of high specific strength, fracture toughness, fatigue strength and good molding process. It is known as one of the most promising lightweight structural materials. It plays an irreplaceable role in aerospace, ship, automobile, high-speed rail, rail transit and nuclear industry. Due to the face centered cubic structure of aluminum alloy, the solubility of hydrogen in aluminum is very low, and the formation of hydrides is difficult, therefore, researchers generally believe that there is no hydrogen induced cracking in aluminum alloy for a long time. However, with the […]

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What are the common stamping steel plates?

The commonly used stamping steel plates materials are: various steel plates, stainless steel plates, aluminum plates, copper plates and other non-metallic plates. Classification of steel plate (including strip steel) 1. Classification by thickness: (1) thin plate (2) medium plate (3) thick plate (4) extra thick plate 2. Classification by production method: (1) hot rolled steel plate (2) cold rolled steel plate 3. According to the surface characteristics, the following categories are as follows: (1) galvanized plate (hot dip galvanized plate, electro galvanized plate) (2) tinplate (3) composite steel plate (4) color coated steel plate 4. Classification by purpose: (1) bridge […]

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What is a steam trap

What is a steam trap? Steam trap is called trap, also known as automatic drain or condensate drain, which is divided into steam system and gas system. The steam trap is installed at the end of the pipe heated by steam, and its function is to continuously discharge the condensed water from the steam heated pipe to the outside of the pipe. Most of the steam traps can automatically identify steam and water (excluding thermal static type), so as to achieve the purpose of automatic steam blocking and drainage. Steam trap is widely used in petrochemical, food, pharmaceutical, power plant […]

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Welding technology of metal materials

What is welding technology? Welding: usually refers to the welding of metal. It is a forming method by heating or pressing, or both at the same time, so that two separate objects produce the binding force between atoms and form a whole body. Classification of welding According to the different heating degree and process characteristics, welding methods can be divided into three categories. (1) Fusion welding. The welding part of the workpiece is heated to the melting state locally to form a molten pool (usually with filler metal added). After cooling and crystallizing, the weld is formed, which is combined […]

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Failure of flange seal

One of the most effective sealing forms for coal chemical enterprises is flange sealing. This paper introduces the principle of flange sealing, analyzes the factors leading to flange sealing failure, and puts forward the measures to improve the sealing performance of flange. In coal chemical plant, pipes, fittings, valves, instruments and equipment are connected by flange. The flange connection mode has the advantages of reliable, convenient disassembly and no hot work. Coal chemical production process often involves high temperature, high pressure and other processes. The flowing medium in equipment and pipeline has the characteristics of high temperature, high pressure, toxic, […]

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The difference between cast valve and forged valve

Casting valves are valves made by casting. Generally, the pressure grades of cast valves are relatively low (such as PN16, PN25, PN40, but there are also high-pressure ones, which can reach 1500Lb, 2500Lb), and most of their calibers are above DN50. Forged valves are forged and are generally used in high-grade pipelines with relatively small diameters, generally below DN50. Casting 1. Casting: It is the process of smelting metal into a liquid that meets certain requirements and pouring it into a mold, cooling, solidifying, and cleaning to obtain castings (parts or blanks) with predetermined shapes, sizes and properties. The basic […]

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Study on processing technology of 316L stainless steel flange

Aiming at the problems of the flange parts in the first piece trial cutting process, such as the parts precision is not up to standard, the efficiency is low, and it is impossible to batch. The main reasons for the above problems are analyzed. At the same time, it is proposed that the optimization of processing technology and the design of special fixture are the main ways to solve the problems. The practice shows that the improved processing technology can improve the processing efficiency of parts by about 75%, and the qualified rate of products can reach 100%, which provides […]

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Crevice corrosion behavior of several super stainless steels in simulated flue……

Flue gas desulfurization (FGD) is an important means for thermal power plants and iron and steel industry to effectively control SO2 emission, and is one of the key areas of environmental protection industry. In the past 10 years, FGD industry has developed rapidly, its equipment localization rate has reached more than 90%, the industry market is huge, and the prospect is attractive. FGD equipment system is very complex, the corrosion environment is very harsh, and the metal components often have serious corrosion problems. In this environment, the flue gas temperature changes greatly, and the critical temperature fluctuates, which is easy […]

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From the accident of Jiaxing thermal power plant: measures to prevent steam pi……

The steam pipe burst in the boiler operation room of Jiaxing thermal power plant. According to preliminary investigation, the main steam pipe of boiler 1 in Fuxin thermal power plant burst at the branch pipe of temperature and pressure reduction station. The accident happened in the boiler operation room. There was a lot of steam, no open smoke and no open fire. Explosion causes of high pressure steam pipeline Unreasonable pipeline design Insufficient pipeline flexibility Due to the unreasonable structure of the pipeline, the connection form of the pipe fitting and the valve or the inconsistent screw system, the pipeline […]

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