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The annealing process is so simple

Today we will talk about the annealing process, the classification of annealing methods, and the selection of methods. Annealing process The heat treatment process of heating metal or alloy to appropriate temperature, holding for a certain period of time, and then slowly cooling (generally with furnace cooling) is called annealing. The essence of annealing is to heat the steel to austenite and then carry out pearlite transformation. The structure after annealing is close to the equilibrium structure. The purpose of annealing: (1) The hardness of the steel is reduced and the plasticity is improved, which is convenient for machining and […]

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Global stainless steel and raw material market outlook in 2021 and the future

Current situation of world stainless steel industry In 2020, the global crude stainless steel output will be 53.13 million tons, and the steel output will be 45.25 million tons. According to the shape of products, it can be divided into plate and long material. Among them, stainless steel plate products are about 38 million tons (accounting for 84%), and long material products are about 7 million tons (accounting for 16%). According to the characteristics of products, it can be divided into three categories: conventional products, value-added products and high value-added products. Among them, customers choose suppliers according to the price […]

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Determination and elimination of white spots in forging steel

The “white spot” in forging is a common product of metallurgy and forging. This defect is found in the forging produced in the smelting of materials. The white spot is distributed in the center of forging in group form, which is very harmful to forging. How to accurately determine “white point” in forging and take appropriate post forging heat treatment process to eliminate this defect is the forging enterprise’s production in forging Important quality assurance measures in production. White spot is a common dense defect in forgings. How to correctly determine the “white spot” of forgings by ultrasonic flaw detection […]

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Introduction to Valve Casting Process

Casting technology of valve Overview and characteristics of foundry It is called casting that liquid metal is poured into the mold cavity which is suitable for the shape of the parts, and then solidified to obtain the parts with certain shape, size and surface quality. Overview of Foundry Technology Casting has a long history, about 3000 BC, mankind has cast a variety of exquisite bronzes. But for thousands of years, it was made by hand from clay, sand and other natural materials. The output of castings is very small. With the development of industrial revolution, the increase of mechanization and […]

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Application of butterfly valve and gate valve under different working conditions

Gate valve and butterfly valve are used in the pipeline to regulate the flow. Of course, there are some methods in the selection of butterfly valve and gate valve. In the water supply network, in order to reduce the soil depth of the pipeline, butterfly valve is generally selected for the larger diameter pipeline. If it has little effect on the soil depth, gate valve is selected. However, the price of gate valve with the same specification is higher than that of butterfly valve. As for the demarcation line of caliber, it should be considered according to the specific situation. […]

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What is a valve

What is a valve? In fluid piping system, valve is the control element, its main function is to isolate equipment and piping system, regulate flow, prevent backflow, regulate and discharge pressure. The valve can be used to control the flow of air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. Because it is very important to select the most suitable valve for the piping system, it is very important to understand the characteristics of the valve and the steps and basis for selecting the valve. Classification of valves There are two main types of valves: 1. Automatic […]

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How to judge the quality of solenoid valve quickly?

The quality of the solenoid valve depends on two aspects: one is the coil, The second is valve body. So the test is mainly to test these two aspects. If you find a 24V power supply, connect it to the coil. If you can hear the sound, it means that the coil and valve core of the solenoid valve are normal, and can be sucked normally. Then check whether the air leaks. If there is air source, the best way is to connect the air source directly to judge whether the air leaks. If there is no air source, you […]

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Selection and installation of control valve

In the automatic control of modern chemical plant, regulating valve is very important. By receiving the control signal from the control unit, the process parameters such as medium flow, pressure, temperature and liquid level can be changed. It can be said that the regulating valve is the last gate in the process loop. Therefore, how to correctly select the control valve to achieve the best control effect has become a key problem. Selection of control valve The selection of control valve should be based on the characteristics of control system, interference source and S (valve resistance ratio) value. General selection […]

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10 kinds of common pipe connection technology

Pipeline connection is a very important link in engineering construction, which is directly related to the quality of the project. With the rapid development of the pipeline industry, there are more and more methods to connect pipelines. However, different pipelines have their own advantages and disadvantages, and also have different uses. The correct selection of connection methods is a skill that engineering personnel must have. The process of this paper summarizes the characteristics of 10 pipe connection methods, and provides relevant pictures and texts for you to learn and exchange. Threaded connection It is called screw connection, which connects pipes […]

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Do stainless steel bolts must be used for stainless steel flanges?

There are often many owners who force the contractor to rectify on the ground that stainless steel flange using carbon steel or alloy steel bolts will cause corrosion, but it is difficult to explain the numerous grievances of the contractor. But is it really hard to explain? Actually, it’s easy to explain. 1. Article 5.8.7 of GB50316-2000(2008) code for design of industrial metal pipelines: under the condition of severe cycle, bolts or double-headed studs for flange connection shall be made of alloy steel. Note: Under the condition of severe cycle (refers to the occasion where the internal stress of pipeline […]

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