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Six heat treatment questions

What is annealing of steel? What are the types and uses of annealing? Answer: Annealing of steel: Annealing is a heat treatment process that heats steel to a temperature above or below the critical point AC1, and then slowly cools it with the furnace after holding it for a certain period of time to obtain a nearly equilibrium structure. Annealing types: According to the heating temperature, it can be divided into annealing above or below the critical temperature AC1. The former includes complete annealing, incomplete annealing, spheroidizing annealing, and homogenizing annealing, and the latter includes recrystallization annealing and stress relief […]

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Effect of Aging Time on Hydrofluoric Acid Corrosion Resistance of 2205 Duplex ……

The precipitate will affect the corrosion performance of 2205 duplex stainless steel in hydrofluoric acid solution. In order to understand this effect, the microstructure of the solution-treated 2205 duplex stainless steel after aging at 800 ℃ for 15, 60 and 120 min was observed through a metallographic microscope, and X-ray diffraction technology was used to analyze the material under different aging times. Phase structure, with the aid of electrochemical polarization and electrochemical impedance methods, the influence of aging time on the hydrofluoric acid corrosion resistance of 2205 duplex stainless steel was tested. The results show that when the aging time […]

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Why is the stop valve low in and high out?

Stop valve, also known as shut-off valve, belongs to the forced sealing valve, is a kind of block valve. According to the connection mode, it can be divided into three types: flange connection, screw thread connection and welding connection. China’s “three modernizations to” once stipulated that the flow direction of the stop valve should be from top to bottom, so the installation has directionality. This type of shut-off valve is very suitable for shut-off or regulation and throttling. Because the opening or closing stroke of the valve stem is relatively short, and has a very reliable cut-off function, and because […]

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How to choose right gaskets?

What is a gasket? Gasket is made of nonmetal, metal or metal nonmetal, placed between the two planes to strengthen the sealing material, in order to prevent fluid leakage, the sealing element is set between the static sealing faces. Standard of gaskets The most common standards of gaskets are: BS10:2009: British Standard specification for flanges and bolting for pipes, valves and fittings. DIN: German Institute for Standardisation (the German Institute for Standardisation). ANSI: the American National Standards Institute. ASA: the American Standards Association (now ANSI). ASME: the American Society of Mechanical Engineers The ASME B16.47 Series A and B took […]

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Advantages of stainless steel pipe compared with PPR pipe

The stainless steel water pipe is safe, clean, hygienic and durable. It is the best direct drinking water pipe. Plastic pipe is generally made of synthetic resin, that is, polyester, stabilizer, lubricant, plasticizer, etc. It is mainly used for water supply system piping, drainage, exhaust and sewage sanitary pipe, underground drainage pipe system, rainwater pipe and threading pipe for wire installation. The stainless steel water pipe has superior sanitary performance, eliminates the problems of “red water, blue-green water, dark water”, and has no peculiar smell, no scaling, no harmful substance precipitation, and keeps the water pure and harmless to human […]

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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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