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Titanium alloy materials for aerospace fasteners

Fastener, as an important universal basic component, plays an important role in industry, and is called “the rice of industry”. Mr. Wu Guanghui, the famous chief designer of ARJ21-700 aircraft in China, also praised fasteners as “tens of thousands of types, groups, connecting structures, connecting systems, small things and big things [1]. According to the types, fasteners can be divided into 13 categories: bolt, screw, stud, nut, wood screw, self tapping screw, washer, rivet, pin, retaining ring, link pair and fastener assembly; according to the application field, fasteners can be divided into general purpose fasteners and aerospace fasteners. In the […]

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What is vacuum heat treatment technology?

What is vacuum heat treatment technology? Vacuum heat treatment technology mainly refers to a new type of heat treatment technology combining vacuum technology and heat treatment technology. Among them, the vacuum environment of vacuum heat treatment refers to an atmosphere environment lower than one atmospheric pressure, including low vacuum, medium vacuum, high vacuum and ultra-high vacuum. Therefore, vacuum heat treatment actually belongs to atmosphere controlled heat treatment. Vacuum heat treatment means that all and part of the heat treatment process are carried out in vacuum state. Vacuum heat treatment can achieve almost all the heat treatment processes that can be […]

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Annealing, normalizing and quenching of steel pipes

What is annealing of steel pipe? What are the types and uses of annealing? Answer: Annealing of steel pipe: annealing is a heat treatment process that heats the steel pipe to the temperature above or below the critical point AC1, and cools slowly with the furnace after holding for a certain time to obtain the structure close to the equilibrium state. Annealing type: 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, homogenizing annealing, and the latter includes recrystallization annealing and stress […]

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Operation method, intention and application key of heat treatment process

Annealing Method of annealing operation: after heating the steel to AC3 + 30 ~ 50c or AC1 + 30 ~ 50c or below AC1 (relevant materials can be consulted), it usually cools slowly with the furnace temperature. Intention of annealing: Reduce hardness, improve plasticity, improve machining and pressure machining functions; Refine the grain, improve the mechanical function, and prepare for the next process; Eliminate the internal stress caused by cold and hot working. The key of annealing application: (1) It is suitable for forging and welding parts of alloy structural steel, carbon structural steel, alloy structural steel and high-speed steel […]

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Analysis on the causes of assembly bolt looseness and anti looseness measures

Bolt connection is widely used in mechanical equipment, automobile, train, aerospace and other fields. It is the most basic structural form of fastener connection. For assembly plant, especially for construction machinery assembly plant, bolt connection has the advantages of convenient standardization, mass production, simple structure, low cost, convenient installation, easy disassembly and so on, and is the most widely used Application. When the equipment is in use due to vibration, high and low load change, impact or long-term working state, the bolt is easy to loose, which directly affects the operation performance of the equipment and reduces its safety and […]

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Application status and key design requirements of cryogenic valve in LNG field

What is liquefied natural gas? Liquefied natural gas or LNG, is mainly composed of methane and is recognized as the cleanest fossil energy on earth. It is colorless, tasteless, nontoxic and noncorrosive. Its volume is about 1/625 of that of the same amount of gas, and the quality of liquefied natural gas is only about 45% of that of the same amount of water. The manufacturing process is to purify the natural gas produced in the gas field and transport it by LNG ship after a series of ultra-low temperature liquefaction. Liquefied natural gas (LNG) is a kind of advanced […]

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How to tighten flange bolts scientifically?

Fastening technical requirements for installation process of equipment and pipeline flange (1) Inspection of flange fasteners Gasket: During installation, make sure that the gasket is new, clean and dry, and check whether the gasket is defective and damaged; the old gasket cannot be reused; before installation, confirm that the size and grade of the gasket used are consistent with the flange identification. Flange: Before installation, check whether the flange surface is damaged, such as scratches, nicks, mud, corrosion and burrs. If the depth of the dents and scratches that run radially through the water lines of the flange sealing surface […]

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What to do if the rusty screw can’t be unscrewed?

I believe that many friends have encountered such a situation, that is, the rusty screws can not be unscrewed. Don’t worry. I’ll share some tips with you today. It’s easy to turn it on. No more brute force. Come and have a look! 1. Cola Put coke directly on the rusty screw. After standing for a while, you will find that the screw can be easily unscrewed. This is because Coke contains carbonic acid and iron oxide, which can be removed by chemical reaction. 2. Alcohol + white vinegar + detergent Add some water to the bottle, then pour in […]

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Design of steam pipeline in petrochemical plant

With the continuous improvement of China’s economic level, China’s petrochemical industry has made great achievements. In the whole chemical industry, petrochemical plant plays a very important role, and steam pipeline, as an important part of petrochemical plant, also plays an important role. Steam pipeline mainly includes steam pipeline and steam condensate pipeline. Through the reasonable design of piping in steam pipeline, the economy of steam pipeline can be improved. Safety, environmental protection and energy conservation are of great significance to the development of the whole petrochemical industry. Design of steam pipeline Many different pipelines are set in chemical plant, which […]

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What is the difference between I-beam and H-beam?

It is often asked that the shape of I-beam is similar to that of H-beam. How to choose it in practice? Many people who have been engaged in the construction industry for many years cannot explain it in detail. Here’s a detailed answer for you: many people think that I-beam is called in China and H-beam is called in foreign countries. In fact, this cognition is wrong. H-beam and I-beam are different in shape, as shown in the following figure: What is I-beam? I-beam, also known as universal beam, is a long steel with I-beam section. I-beam is divided into ordinary I-beam […]

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